July 17, 2012
Join the "CWTD Yahoo Group" for email discussion in between our weekly sessions by clicking here.
Mid-Year Project Recap
A review of the 30
technical topics and 15 projects we've put in motion during the first half of
this year
... and an update on the status of each!
Overview
We've covered a lot of ground in the thirty (30!) weekly CWTD sessions we've had thus far. And coming back online now fresh from our "summer break", we'll be getting back into the swing of things by overviewing all the projects and technical topics accomplished to-date. So if you missed a session or two, or if you'd like to ask a live question this time (instead of just listening to the podcasts), or if you'd like to get an update on that one "special project" ... this will be the session for you!
73, George N2APB & Joe N2CX
Audio Recording ... (Listen to the MP3 podcast)
Discussion Notes:
<20:10:22> "W2AEW - Alan": I'm currently building a
K5BCQ/K5JHF QRP power meter for a friend: Picture:
https://twitter.com/#!/AlanAtTek/media/slideshow?url=pic.twitter.com%2FHJvmCreB
<20:12:26> "Charles WC5MC":
http://www.wa0itp.com/qrpom.html
<20:12:38> "W2AEW - Alan": Link to their page:
http://www.qsl.net/k/k5bcq/Kits/Kits.html
<20:14:37> "Frank N3PUU":
http://www.arduino.cc/
<20:14:38> "Rich, K7SZ":
http://www.wa0itp.com/qrpom.html
<20:14:41> "W2AEW - Alan": Radio Shack even carries the Arduino now!
<20:16:08> "Ray K2ULR": W1REX
http://www.qrpme.com
<20:16:25> "Lee KM4YY": Can you post URL for the White Board tonight. my email
URL didn't work.
<20:16:40> "Frank N3PUU": the rasberry pi is looking interesting
<20:16:40> "W2AEW - Alan":
http://dl.dropbox.com/u/43021514/CWTD/Jul%2017.html
<20:17:02> "Terry WB4JFI": Arduino-like Papilio boards. Learn FPGAs and
soft-core processors
<20:17:34> "Terry WB4JFI": http://papilio.cc/
<20:17:39> "Charles WC5MC": Oh yeah I got a Pi now :)
<20:21:20> "Terry WB4JFI": Rick: I used to work at the Lafayette Radio in Falls
Church, VA. Still remember 1/8" stereo plug was part# 99-62101.
<20:26:46> "Rick K3IND": George, can you recommen a good SoIC book?
<20:27:27> "Paul - wa0rse": That series was my favorite, Joe and George!!!
<20:28:08> "Paul - wa0rse": Is the sweeper input card for the 908 available? I
can't remember...
<20:31:22> "W2AEW - Alan": link to my distortion video:
http://www.youtube.com/watch?v=XHA4c82msqo
<20:41:01> "Paul - wa0rse": The two detectors (SIC and microwattmeter) are both
unavailable, I think. What were your suggestions for those of us who want to do
something with this now?
<20:42:01> "Paul - wa0rse": great! very generous!
<20:44:03> "Paul - wa0rse": the "keeping it simple" (detector diode and
resistor) approach is one I habitually forget. Thanks for the reminder!
<20:47:27> "W2AEW - Alan": My favorite is the old 1930's classic 130' center-fed
dipole, fed with 450ohm line. Works great on 80-10m
<20:52:40> "George - N2APB": I love using 450-ohm feeder with dipoles like this.
<21:11:34> "Terry WB4JFI": I second the X-Tronic 4000 rework station
<21:13:38> "Paul - wa0rse": I'm sorry I missed those but happy I attended this
recap to bring my attention to these two podcasts!
<21:15:40> "W2AEW - Alan": You can even reference my youtube channel:
http://www.youtube.com/w2aew
<21:16:38> "W2AEW - Alan": sounds good!
<21:28:47> "Pete - WB2QLL": Sometimes..."air terminals"
<21:29:15> "Terry WB4JFI": SSMPS = sometimes switching mode power supply
<21:29:30> "Paul - wa0rse": Otto Schmitt, of the Schmitt trigger, was my M.S.
mentor. He built EVERYTHING using "sky wiring"!!!
<21:29:50> "W2AEW - Alan": Paul - nice!
<21:33:39> "Paul - wa0rse": Bye for now, everyone! 73's
<21:34:35> "W2AEW - Alan": can't wait to make a 10MHz GPS disciplined oscillator
for my bench
<21:37:23> "W2AEW - Alan": Yay - can't wait!
<21:38:46> "W2AEW - Alan": that's incredible
<21:44:53> "W2AEW - Alan": Thanks Armand!
<21:46:46> "Terry WB4JFI": Great job George! Nice summary of the various
sessions.
<21:52:49> "Lee KM4YY": Incredible resource for you fellow amateurs! Excellent
job, George/Joe!
<21:53:50> "Frank N3PUU": yes, thanks George and Joe!
<21:54:31> "Charles WC5MC": Amazing amount of prep work that you make look easy.
Good job
<21:56:52> "Ray K2ULR": N1RX
<21:59:32> "W2AEW - Alan": 73 all, thanks!
Nov 22, 2011 ... RF Power Measurements for QRPers:
Normal ham usage in-line watt meters
HR WM2, analog with 3 ranges 100mw, 1 watt and 10 watt full scale ...
Norcal power meter digital and analog 10W max resolution 0.1 w ... currently out of stock
Lab grade low power RF measurement not in-line
Homebrew W7ZOI analog power meter nanowatts to 20 mW ... "Simple RF Power Measurement" QST June 2001
"Ugly style" kit from Kanga US at Dayton this year -$55. Includes 40 dB tap
"Simple RF Power Measurement" QST June 2001
Digital power meter by KA7EXM (son of W7ZOI) :
LP-100 digital vector wattmeter 50 mW to 3000 W ... "The LP100 Wattmeter", QEX Jan/Feb 2004 ... $435 ...
40 dB tap can be built for under $25 with info from W7ZOI article
Elecraft W1 Power Meter ...
Great power reference chart .... QRP Quarterly magazine for Spring 2003, page 42
DBM chart: www.minicircuits.com/pages/pdfs/dg03-110.pdf
NT7S QRP-L Rig test procedures sheet 11 has that conversion chart you mentioned.
WB9KZY Chuck Olson, Jackson Harbor battery kit: http://wb9kzy.com/batsave.htm $4.50 plus shipping
Battery power-off timer circuit .... http://newenglandqrp.org/battery-saver
Simple RF-Power Measurement, Making power measurements from nanowatts to 100 watts is easy with these simple homebrewed instruments ... June 2001 QST, page 38
+7dBm = 5mW
home-brew 40dB tap: www.n5ese.com/tap_atten.htm
Great out-of-print homebrewing reference: Solid State Design for the Radio Amateur: http://www.amazon.com/Solid-State-Design-Radio-Amateur/dp/0872592014 only $173 from: http://www.barnesandnoble.com/w/solid-state-design-for-the-radio-amateur-american-radio-relay-league-incorporated/1000133512
Joe N2CX -- Sweeper: Sweep frequency into a Device Under Test and measure/plot
response on a log detector
Bruce N1RX -- Battery sleep timer
Carl W8KRF
Chuck WA6LTV -- Need a customized filter display, 1% accurate power meter
Dave AD7JT -- Overview of the keyer software for the NUE-PSK modem
Gerry
N2GJ
Douglas ____ - ARISSAT TLM w/AMSAT
Ken VA3KMD -- Software in the Micro908
Milt W8NUE -- AQRP projects
Frank N3PUU -- Batter monitor, INA 219 "High Side Current & Shunt Monitor"
<20:17:03>"George - N2APB1": ***** KIT TOPIC ... Arduino kits (N2CX)
<20:22:05>"Ray K2ULR": Reminder.. it's PTT.. not just hit the key
<20:23:22>"George - N2APB1": ***** KIT TOPIC ... Genesis G59 SDR kit, Arduino (WiFi radio project w/router), SDR 5W amp HF Projects & Filter Kit (W0ANM)
<20:25:37>"George - N2APB1": ***** KIT TOPIC ... Penny Whistle 20W amp, new 10m antenna in an antenna-restricted neighborhood (AD7JT)
<20:27:26>"George - N2APB1": ***** KIT TOPIC ... ATS-3, HRO-M(?), HRO-60 (AA3UR)
<20:28:07>"George - N2APB1": ***** KIT TOPIC ... QRP Kits PRF-3, Active Audio Filter (LM386 vs. LM380?) (WA2DJN)
<20:30:54>"George - N2APB1": ***** KIT TOPIC ... NorCal QRP Pwr Meter, Softrocks, NJQRP classic, AMSAT projects (analyze telemetry from ARISAT, spiraling in over next couple of months, upcoming FOX-1 sat (KA2UPW)
<20:34:43>"George - N2APB1": ***** KIT TOPIC ... Arduino projects, Softrock Ensemble RXTX 17/20/30 (N3PUU)
<20:34:53>"Chris - w0anm": small wonder labs sw-40 great price, single band easy build
<20:35:13>"Frank N3PUU": thx Chris
<20:35:56>"Joe - N2CX": SW-40 a great choice but has VFO unlike SW-40 which is one freq!
<20:37:44>"Chris - w0anm": small wonders makes both rockmites and sw-40. sw-40 does have vfo as rockmites are rockbound. My sw-40 works much better that the rockmite.
<20:38:09>"Chris - w0anm": http://www.smallwonderlabs.com/
<20:38:20>"George - N2APB1": ***** KIT TOPIC ... SDR Cube, Rock-Mite (NJ2E)
<20:39:12>"George - N2APB1": ***** KIT TOPIC ... precision Freq Measurement, Parallax "Propeller" chip to control a Rubidium freq standard, Micro908 Antenna Analyzer, (N5VP)
<20:41:27>"George - N2APB1": ***** KIT TOPIC ...N2PK VNA with (helper kit), NUE-PSK modem and ICD2 programmer, (VA3KMD)
<20:45:58>"George - N2APB1": ***** KIT TOPIC ... G3XJP "PIC-A-STAR"!!!!! instrumentation kits, Si570 Sig Gen, SWL-40, Modular Spectrum Analyzer 8307-based log detector (W2HHV)
<20:46:23>"Joe - N2CX": Small wonder labs sells cabinet and external controls kits as well as SW40
<20:52:19>"George - N2APB1": ***** KIT TOPIC ... STM discovery board, Arduino Teensy++, AQRP Plug-in, EasyDSP from TI, Softrock Ensemble RXTX, AQRP's SDR2GO + Softrock, AQRP Digital Wattmeter, I2C graphics display & panadapter (W8NUE)
<20:53:38>"Joe - N2CX": Radio shack is selling some Arduino and Parallax kits!
<20:55:25>"George - N2APB1": ***** KIT TOPIC ... KX3, QRP Kits Tuner, [K2ULR)
<20:59:12>"George - N2APB1": ***** KIT TOPIC ... Benton Harbor Lunch Box(!), PICAXE (!!!), SCAF Audio Filter for the SB1400 Transceiver (K3IND)
<21:01:19>"George - N2APB1": ***** KIT TPOIC: Boatanchors: Collins R-390, Viking Invader 2000, National 183D, HRO-60, HRO-Jr (N2APB
<21:05:14>"George - N2APB1": ***** KIT TPOIC: Elecraft 2-Tone Generator, Directional Couplers [K2CK]
<21:10:18>"George - N2APB1": ***** KIT TOPIC ... Simple Sweeper a la Arduino, remotable Elecraft T1 Tuner, remote tuning the MFJ and Midnight Loops, portable operating desk, American Morse Keyer, wishlist of books(!): PDF/Kindle material, K8IQY "Magic Box T/R Switch" [N2CX]
<21:11:10>"Joe - N2CX": Hi Q
<21:21:56>"Douglas KA2UPW": http://w3nqn.com/details.html
<21:22:15>"Douglas KA2UPW": and http://w3nqn.com/build.html
<21:25:34>"George - N2APB1": ***** KIT TOPIC ... RTCC option with the NUE-PSK modem [K2CK)
<21:25:37>"Rick K3IND": Built a rtty filter w/88mh toroids in 1963 -- hooked to a Kleinschmidt!
<21:26:12>"Chris - w0anm": Rick, I did too, a rtty decoder with a model 19.. (late 70's)
<21:35:51>"George - N2APB1": Elecraft XG-2: Measures sensitivity, selectivity, S-meter calibration ... good signal source
<21:36:38>"George - N2APB1": Audio amplifiers: LM386 (popular, higher hiss, possibly less stable, lower power)
<21:38:17>"George - N2APB1": Audio Amps: LM380 ... more power output, more stable, less hiss, more power required (+20ma)
<21:43:40>"Rick K3IND": George, Heath SB-1400 is repackaged Yaesu FT-747GX
<21:46:42>"Chris - w0anm": I've built an arduino HF amp controller for evaluation for a larger amp project.
<21:46:48>"Joe - N2CX": ST microelectronics TDA2822M stereo power amp in DIP
<21:48:30>"Rick K3IND": round-tuits make great stocking stuffers!
<21:52:27>"Bill - KD5TFD": No panadapter === no fun
<21:56:00>"Joe - N2CX": http://eksfiles.net/elmer-101-kit-building-materials/
<21:56:16>"Joe - N2CX": SW-40 is from Small Wonder Labs
<21:57:26>"Ray K2ULR": Hendricks is supposed to be kitting the SMK-1 again soon.
<22:00:27>"Bill - KD5TFD": http://hackaday.com/2010/10/12/arm-prototyping-on-the-cheap-with-stm32-discovery/
<22:01:18>"Ray K2ULR": http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATA_BRIEF/DM00037955.pdf
<22:06:14>"Bill - KD5TFD": Have a funcube .. bummer is the docs are mostly under NDA ... don't think it has bandwidth to really do broadcast FM
<22:07:13>"Douglas KA2UPW": http://www.funcubedongle.com/
<22:07:13>"Milt-W8NUE": STM32f4discovery board--$16.25 at Mouser
Dec 13, 2011 ...
Favorite Parts & Kits Suppliers:<20:09:10>"George - N2APB1":
http://www.makershed.com
<20:10:04>"George - N2APB1": Lady Ada ...
http://www.ladyada.net
<20:10:48>"George - N2APB1":
http://www.norcalqrp.org
<20:11:21>"George - N2APB1":
http://kd1jv.qrpradio.com
<20:11:42>"George - N2APB1":
http://www.qrpkits.com
<20:12:24>"George - N2APB1": Wilderness Radio ...
http://fix.net/~jparker/wild.html
<20:13:19>"George - N2APB1": jackson Harbor Press ... http://www.wb9kzy.com/ham.htm
<20:14:28>"Bruce - N1RX":
http://www.kitsandparts.com/ toroids, etc
<20:16:27>"George - N2APB1": Diz W8DIZ runs Kits and Parts ... great supply of
toroids. Responsive and great prices
<20:17:35>"John - KE3S": Small Wonder Labs
<20:17:55>"George - N2APB1": PICAXE supplier ... Peter H. Anderson
<20:19:08>"Joe - N2CX":
http://www.phanderson.com/ ... do not type panderson - that is a baaasd site!
<20:20:24>"Bruce - N1RX": Rex, W1REX the tuna-tin man at QRPme also has small
picaxe kits http://www.qrpme.com
<20:21:31>"Joe - N2CX": Diz has reasonable shipping charge for small orders
<20:22:24>"Bob - wb6kwt": www.vakits.com/
<20:22:47>"Bruce - N1RX": one tip to consolidate shipping is to keep and
maintain a list of items you want or need. Then place an order when you get
enough to justify an order. It's the same as a grocery list- only go when it's
worth it. Stock up!
<20:23:25>"Bruce - N1RX": Or, BEG on qrp-l etc. People can be nice!
<20:24:15>"Joe - N2CX": When you order cheap parts say you need one or two -
consider ordreing 10 - you will need them later!
<20:24:33>"Chris - w0anm": Arduino Kits -->
http://moderndevices.com , also have LCD serial kits.
<20:25:38>"Joe - N2CX": Geo, forgot to mention Tony Parks - kits sell out
quickly - tips for finding out when they are available.
<20:25:49>"Milt-W8NUE":
www.allelectronics.com
<20:26:04>"Bruce - N1RX":
http://www.amqrp.org/misc/links.html
<20:26:19>"Milt-W8NUE":
www.goldmine-elec.com
<20:26:31>"Frank N3PUU": kb9yig
<20:29:20>"George - N2APB1": GREAT set of llinks that I use on a regular, daily
basis ...
http://www.amqrp.org/misc/links.html
<20:29:38>"Chris - w0anm": Hard to find parts, some interesting stuff --> http://electronicplus.com
<20:29:52>"Milt-W8NUE": Oceanstate Electronics http://www.oselectronics.com/
<20:30:01>"George - N2APB1":
http://www.dspradio.org
<20:30:04>"Bruce - N1RX":
http://thepartsplace.k5nwa.com/
<20:30:23>"Joe - N2CX": Ocean states has a bad rap from some for sloooooow
shipping.
<20:31:05>"Chris - w0anm": Not qrp, but some QRO vintage parts --> http://www.surplussales.com/
<20:31:38>"Milt-W8NUE": Softrock kit info www.wb5rvz.com/sdr/
<20:32:16>"Bruce - N1RX":
www.smallwonderlabs.com
<20:36:12>"Chris - w0anm": I built the emtech transciever for 40M nice
rig. Tuner is nice too.
<20:36:38>"Milt-W8NUE": The ZM-2 is a compact 5-1/16" x 2-5/8" x 1-5/8" and
weighs only 8 oz. Great for backpacking.
<20:38:33>"George - N2APB1":
http://www.steadynet.com/catalog/index.php?main_page=index&cPath=25 ...
POLYVARICONS
<20:40:51>"Joe - N2CX": Dan's small parts is another relatively good site. Kits
are ok but plenty of parts takes only cash!
<20:41:40>"Joe - N2CX": Jameco is another big parts vendor that often has stuff
that Digiey and Mouser do not.
<20:44:03>"Joe - N2CX": For LEDs try
http://unclecytheledguy.com/
<20:44:43>"George - N2APB1": POLYPAKS!!!! Man, those were the days!
<20:45:15>"Joe - N2CX": Bruce I used to love John Meshna!
<20:45:49>"Bruce - N1RX": Yes!
<20:45:59>"Ray K2ULR": Marlin P. Jones <http://www.mpja.com/>
<20:46:16>"Joe - N2CX": Historical info - at one time Radio Shack was
associated with Allied Electronics
<20:47:26>"Bruce - N1RX": We have a local Radio Shack and snowmobile repair
shop, all in one. He has parts that have literally been on the shelf since the
1970s!
<20:48:18>"Bruce - N1RX": Pulling parts for old boards is a time-honored
tradition. I have a few cubic feet of computer boards etc on hand for use as
donors.
<20:52:40>"George - N2APB1":
http://www.harborfreight.com/
<20:52:53>"Rick K3IND": Whatever happened to Lafayette for parts?
<20:54:34>"Ray K2ULR": HF has a "spot weld remover" which makes very nice pads
for Manhattan construction
<20:55:46>"Ray K2ULR": <http://www.harborfreight.com/3-8-eighth-inch-double-sided-rotary-spot-weld-cutter-95343.html>
<20:57:43>"Frank N3PUU": another place along the harbor freight line is Grizzly
industrial
<20:59:47>"Joe - N2CX": Northern Hydraulics is another good tool source.
<21:03:08>"Milt-W8NUE": TI eZDSP C5535 site:
http://www.ti.com/tool/tmdx5535ezdsp
<21:09:24>"Ted W2TAG":
www.ldbepruchase.com has C hinese equipment at decent
prices.
<21:10:53>"Milt-W8NUE":
http://magazine-subscription-search.com/prd101588.php
<21:12:22>"Joe - N2CX":
http://www.rsgb.org/news-radcom/radcom/?month=December&year=2011
<21:12:29>"Ted W2TAG": I baught a bench counter 0.1 hz to 2.4 GHz, a Precision
bench type RF signal generator and a bench DMM from them.
<21:14:23>"Milt-W8NUE": may be of interest--just ordered one L/C meter---
http://www.ebay.com/itm/NEW-LC100-A-Digital-LCD-High-Precision-Inductance-Capacitance-L-C-Meter-/270840165867
<20:12:13>"George - N2APB": Familiar source is ARRL
http://www.arrl.org
<20:12:27>"George - N2APB": ARRL Radio Amateur Handbook
<20:12:32>"George - N2APB": ARRL Antenna Book
<20:13:04>"George - N2APB": Several QRP books (QRP Power, by Rich Arland, K7SZ)
<20:13:14>"George - N2APB": Antenna Compendium up to Vol 8
<20:13:27>"Rick K3IND": Question on "RF Design"...
<20:13:31>"George - N2APB": Experimental Methods in RF Design ... Wes Hayward
<20:14:04>"Rick K3IND": mine has a lot of words missing...
<20:14:13>"George - N2APB": ON4UN's Low Band DXing good reference for operating
on 80/40/160m
<20:19:10>"Joe - N2CX": WB4JFI
<20:21:22>"George - N2APB": Excellent books from RSGB very high quality content
… www.rsgb.shop RSGB Radiocommunication
Handbook, and several other books covering UHF/VHF, antennas, etc.
<20:22:27>"George - N2APB": GQRP has British and Australian books …
http://www.gqrp.com.sales.htm
<20:23:23>"Ray K2ULR": I have a book to add.
<20:27:45>"George - N2APB": ARRL Digital Signal Processing
<20:28:07>"George - N2APB": Oppenheim & Schaffer ... good ref for DSP algorithms
and theory
<20:28:33>"George - N2APB": Microchip has great tools and libraries for embedded
programming
<20:29:07>"Joe - N2CX": ARRL has a closout sale on Digital Signal Processing
Technology!
<20:29:33>"George - N2APB": Practical Digital Signal Processing for Engineers
and Technicians, on www.Amazon.com
... good as a used book. Gets into college level math, good for engineers, well
illustrated
<20:32:25>"George - N2APB": www.dspguide.com
<20:34:56>"Joe - N2CX": I was lucky enough to get that book as a doorprize at
the TAPR CC!
<20:35:30>"George - N2APB": Understanding Digital Signal processing, Second
Edition, by Richard G. Lyons ... #1 reference recommendation
<20:36:04>"George - N2APB": Radio Frequency Design, by Wes hayward, from the
ARRL Bookstore ... great for RF design material
<20:37:53>"Joe - N2CX": Education is expensive no matter how you get it!
<20:39:16>"George - N2APB": QRP Tech ... Yahoo group dealing with technical
topics, run by Chuck Adams, K7QO
<20:42:02>"Joe - N2CX": K7QO tech list groups.yahoo.com/group/qrp-tech
<20:43:25>"George - N2APB": Austin QRP Group, AQRP Yahoo Group ... join it! ...
Active projects: Morse Buddy, Digital Wattmeter, I2C/SPI interface for LCD
display, Temperature/Barameter Kits with RF link ... just doing it for
fun! Google for K5BCQ Kits
<20:44:29>"Jim - N2ADR": Digital Signal Processing in Communication
Systems, Marvin E. Frerking
<20:48:30>"Joe - N2CX": $130.31 on Amazon!
<20:49:50>"George - N2APB": HalfPriceBooks in Austin, TX
<20:49:53>"Joe - N2CX": Half Price books i this area has nearly no tch books...
<20:53:28>"George - N2APB": Boatanchor Manual Archive …
http://bama.edebris.com/manuals/
... but it's down right now
<20:53:50>"George - N2APB": Wes Hayward W7ZOI …
http://w7zoi.net
<20:54:15>"George - N2APB": Snow camping with Wes and son Roger
<20:54:42>"George - N2APB": Steve Yates AA5TB Homebrew, antennas, loops …
http://aa5tb.com
<20:55:21>"George - N2APB": Successful antennas, antenna calculator for
parameters of Mag Loops (STLs), hands-on info and usage of EFHW (end fed half
wave antennas)
<20:55:39>"George - N2APB": Harry Lythall Homebrew …
http://www.sm0vpo.com
<20:55:50>"oh2nlt": Thank you for interesting meeting. Unfortunately I have to
leave now.
<20:56:03>"George - N2APB": Hans Summers Homebrew …
http://www.hanssummers.com
<21:02:19>"George - N2APB": Here's my customized links ... "my favorites!" ...
http://www.amqrp.org/misc/links.html (N2APB)
<21:04:10>"Joe - N2CX":
http://www.amazon.com/Programming-16-Bit-PIC-Microcontrollers-Technology/dp/0750682922
<21:04:41>"George - N2APB": Basic programming information for 16-bit
microcontrollers by Lucio Di Jasio "Prgramming 16-bit Microcontrllers in
C" (aka: Learning to fly the PIC24) See Amazon.com link above.
<21:06:57>"George - N2APB": FPGA reference: Rapid Prototyping of Digital
Systems, using Altera Gate arrays ... Cypress line of gate arrays, Microchip
provides the IDE (development system), by Hanlon, Paul and Furman (spelling?)
<21:14:11>"George - N2APB": DSP "Short Course" frm TA{R Digital Communications
Conference 2010 ...
http://www.tapr.org/pdf/DCC2010-DSPcourse-session4-KN6KB.pdf
<21:18:46>"George - N2APB": "Wirebook V" by Press Jones, N8UG ... available from
The Wireman ...
http://thewireman.com/products.html
<21:19:26>"Ray K2ULR": Simple Test Equipment for the QRPer by G3MFJ & G4WIF.
<21:20:24>"George - N2APB": http://k7og.net/?p=69 Simple Equipment for the
QRPer
<21:24:19>"Joe - N2CX": Good for small club kit runs!
<21:24:33>"Ray K2ULR": http://www.myropcb.com/
<21:27:03>"George - N2APB": Reference site for Peter G3XJP ... His documents are
very good reference material, describing basic fabrication and includes
rationale for the development. Example: PIC-A-STAR series of articles from
RADCOM. Antojer; Automated antenna tuner: PIC-A-TUNE ... good insight to Q and
losses. see link to follow from Larry.
<21:28:09>"Larry-W2HHV": PicATUne and Pic-a-STAR II Projects by Peter, G3XJP
at http://uk.groups.yahoo.com/group/picaproject/files/
Dec 27, 2011 ...
Homebrew Filter Design and Measurement Techniques - Part 1: Filter Selection
<20:44:09>"George - N2APB": Great reference on LPF design (and other
types) is in the ARRL Handbook. I'm currently looking at the 2008 edition and
this is in Chapter 12. (Check the index for "Low Pass Filter" in the rear of
the publication)
<20:54:51>"Fred - WA8PGE": here's a pretty nifty toroid calculator, tells you
how much wire you need too..
<20:54:58>"Fred - WA8PGE":
http://kitsandparts.com/tcalc.html
<20:55:38>"George - N2APB": That's indeed a great reference Fred.
<20:58:05>"George - N2APB": Q-Dope ... source for this?
<21:01:40>"Joe - N2CX": Qdope is a General Cement (?) product available from
various electronic suppliers. i think A good source might be Antique Radio in
Arizona.
<21:03:31>"Paul - AK1P": Try <
http://www.hmcelectronics.com/product/GC-Electronics/10-3702>
<21:04:05>"George - N2APB": AADE Filter Designer <http://www.aade.com/filter32/download.htm>
<21:06:02>"George - N2APB": Tonne Software Elsie Student Version <http://tonnesoftware.com/elsie.html>
also in ARRL Handbook disc
<21:06:35>"George - N2APB": Tonne Software SCVFilter <http://tonnesoftware.com/svcfilter.html>
also in ARRL Handbook disc
<21:23:31>"Larry-W2HHV": Topic suggestion: Test equipment most used for QRP
breadboarding? Which items should one buy versus build?
QRP (5 watt) low pass filter design using standard components -- e.g., Amidon powdered iron toroid cores and 5% tolerance capacitors.
Desired performance:
A 5th-order elliptical (Cauer) filter is probably a good way to go for minimum parts to get the desired performance ... see diagram above .
50 ohms input and output impedance
Pass 7.0-to-7.3 MHz with 0.5 dB or less amplitude ripple/attenuation
Reject second harmonic (14 MHz and above) with greater than 40 dB attenuation
Assume Q of 100 for inductors
Suggested free tools & design programs:
AADE Filter Designer ... http://www.aade.com/filter32/download.htm
Tonne Software Elsie Student Version ... http://tonnesoftware.com/elsie.html also in ARRL Handbook disc
Tonne Software SCVFilter ... http://tonnesoftware.com/svcfilter.html also in ARRL Handbook disc
KitsAndParts Toroid Winding Calculator ... http://kitsandparts.com/tcalc.html
Mini-ring (toroid) calculator ... http://www.dl5swb.de/html/mini_ring_core_calculator.htm to evaluate stress levels on the toroid cores.
LTSPICE ... to evaluate the operating voltage levels across each component ... http://www.linear.com/designtools/software/
The Sweeper Input Card (SIC) became a linchpin measurement device for us ... shown on left, and installed in the Micro908
Bonus project ... The Q-Meter:
STATION | FEEDLINE | ANTENNA |
|
|
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Don Butler, N4UJW Hamuniverse.com ...
Pics from good W8JI website ( http://www.w8ji.com/ground_systems.htm ) ...
Simple NiCd NiMH chargers
Linear Technology battery charger IC application notes:
http://cds.linear.com/docs/Application%20Note/an68f.pdf
http://cds.linear.com/docs/Design%20Note/dn395f.pdf
http://cds.linear.com/docs/Design%20Note/dn380f.pdf
http://cds.linear.com/docs/LT%20Journal/LTJournal-V20N4-02-df-LT3652-Jay_Celani.pdf
Here is a very simple NiMH float charger that I have been using once the charge is complete. Some interesting information on NiMH charging --> http://www.ka7oei.com/floaty_thingie.html
Commercial site for battery chargers ... http://www.batteryspace.com/batterychargers.aspx
Battery University ... plenty of info on batteries and charging ... http://batteryuniversity.com/
Powersonic SLA Tech Manual ... http://www.power-sonic.com/images/powersonic/technical/1277751263_20100627-TechManual-Lo.pdf
Powersonic NiCd and NiMH Tech Manual .. http://www.power-sonic.com/images/powersonic/technical/1277751010_20106027-NiCdCatalog-Lo.pdf
KK6MC Batteries and Charging Systems .. www.wa0itp.com/batteriesandchargingsystemskk6mcwhitepaper.pdf
The familiar "napkin design" starting point ...
And on to making a nice schematic using PowerPoint and the N2APB-patented "micro-adjustment" technique ...
Download "perfect" PDF file of SIC schematic -- Notice how all the micro-alignments are perfectly lined up.
Download PowerPoint version of SIC schematic -- Use this as the starting point for making your own project's schematic
Here's the Circad PCB layout results ... And the parts layout view (just showing the silkscreen) ...
And of course the completed SIC card ...
The Growler
A low-cost, compact SWR bridge with LED bargraph display and varying audio tones to indicate measured results. Morse code annunciation of specific SWR values. Good up to 148 MHz.
The Growler is a descendant of the SWR bridge used in the Rainbow Tuner. It keeps the multicolor LED bar graph display to give a visual SWR indication while adding audible outputs. Its heart is a resistive bridge formed from surface mount power resistors. Using surface mount devices and a compact layout provides operation through the 2 meter band as opposed to only HF coverage if leaded resistors were used as in the Rainbow Bridge. The bridge resistors are sized to allow operation at full 5W QRP levels for periods of 15 seconds or less. Simple diode detectors pick off forward and reverse RF and produce DC signals which are fed to PICAXE U1, analog to digital converter inputs. The ratio of these is used to calculate SWR, which illuminates the LEDs. A growling tone whose pitch is proportional to SWR is also controlled by U1 and sounded by the speaker. When the RF signal ends, the speaker sends the SWR numerically in Morse Code. Calculations based on the ratio of forward and reverse signals rather then their absolute numbers preserve measurement accuracy though the finite DC drop of the detector diodes results in increasingly optimistic SWR readings as RF power decreases below approximately one watt.
The Growler PCB
Growler Demo on YouTube
It's not perfect (was still being developed when the video was made), but you can see/hear the circuit in action! ... http://www.youtube.com/watch?v=2JJ9o1GDrGM
Rainbow Tuner schematic diagram
Use of a 40 dB In-Line Power Tap ...
The Power Tap, directly from the W7ZOI article ...
So now, with the DL + Tap conveniently located next to the precision KA7EXM Power Meter, the two BNCs may be connected with a short length of coax to form a single measurement pair ...
And actually measuring the SDR Cube's output power in Tune mode ... -9.9 dBm on the meter = 1.023W (see chart below)
Here's an excellent way to go for building an accurate, high dynamic range power meter, from the AQRP Club guys: K5BCQ, W8NUE, and K5JHF ...
Source: The QRP Quarterly, Spring 2003
www.qrparci.org
A Clean Workbench is [not!] a must ...
The following is original work of N2APB as contributed to the ARRL Handbook, chapter 23 ...
The "Doofus" SMT Hold-Down Device ...
KD5SSJ "SMT Soldering Tools & Process" (http://kd5ssj.com/solderpaste/smt-tools-and-process)
LOTS of videos on scope applications, and ham radio uses for scopes ...
Monitoring your transmitter: https://www.youtube.com/watch?v=y4Zt_LJX1Tc
Basics of 1X/10X Probes: https://www.youtube.com/watch?v=SX4HGNWBe5M
AC/DC Coupling: https://www.youtube.com/watch?v=Hkq-fvb5-NI
Triggering Controls: https://www.youtube.com/watch?v=OFGm-Pel4Hg
Basics of Frequency measurement: https://www.youtube.com/watch?v=OQMnjaMSKn8
Distortion measurements (or not!): https://www.youtube.com/watch?v=XHA4c82msqo
Basics of Lissajous patterns: https://www.youtube.com/watch?v=t6nGiBzGLD8
Simple Component Curve Tracer: https://www.youtube.com/watch?v=Gwo3pEH7hUE
Delayed Timebase operation: https://www.youtube.com/watch?v=J-7MycqHPOs
Three videos on viewing two signals clearly:
Bandwidth Considerations: https://www.youtube.com/watch?v=oZ1Dv2dVGkU
ALT, CHOP, etc. vertical controls: https://www.youtube.com/watch?v=zsy-pxpfB4o
Poor Man's TDR - measure length and Z of coax: https://www.youtube.com/watch?v=Il_eju4D_TM
Test an RF Power Detector: https://www.youtube.com/watch?v=vvqVTD-VEow
Rear Panel I/O:
- create a "marker": https://www.youtube.com/watch?v=QCFBBiIm1h0
- Connect a counter, expand vertical scale: https://www.youtube.com/watch?v=tyA-4Qv8RDs
- Display video! https://www.youtube.com/watch?v=5FYF5uhCzAM
One, for example: Monitoring your transmitter: https://www.youtube.com/watch?v=y4Zt_LJX1Tc
This video shows a few ways that you can monitor your ham radio transmitter with an oscilloscope. Look at the RF carrier, the carrier envelope, the amplitude demodulated signal, as well as linearity "trapazoid" patterns (please see below). It shows a simple circuit I put together for a local ham radio club meeting and presentation.
I put this circuit together to show the radio club members examples of a sampler and a amplitude demodulator. Of course, since these were built onto the same "demonstrator" board with a common RF input, the linearity can not be measured with this since any non-linearity in the output would appear in both sensors. This is indicated by the notes in the video. In order to truly measure the non-linearity of an amplifier or a modulator/exciter, the X-input would normally be driven by the baseband signal, or the demodulated input to an amplifier, etc., and the RF output would be sensed with the sampler and applied to the Y input of the scope.
8 EASY(?) STEPS:
1) Choosing the site
2) Deciding on the mounting
3) Digging the hole
4) Cement base
5) Mounting antenna
6) Laying Radials
7) Feedline into the house
8) Tuning up!
Vertical Antennas
80m Scan
“Mixing 101”
... And what it looks like in real life …
Real Life Spectrum
Here’s a simple circuit that we designed as a group project at one of our Atlanticon QRP conferences several years ago. The idea was to implement the simple approach mentioned above: “Measure all the energy and then take out the fundamental, and as a result leaving a measure of all the unwanted energy being generated.”
And all this is done with straightforward analog components … “we don’t need no stinkin’ computer!”
So the idea is to use this circuit to measure the spectrum energy above the fundamental signal being generated, and then make whatever adjustments possible to reduce this somewhat relative number … reduce the drive, use better shielding, better grounding, better filtering, et al.
The Signal Quality Meter, or ‘SQM’, is a user-friendly device that produces a graphical display of relative quality of an RF signal applied to its input. Using a modern analog integrated circuit and other familiar RF components, the SQM examines an input RF signal and identifies how much unwanted harmonic or other off-frequency components are attenuated. It provides a simple and easy way to determine how “clean” the output of an oscillator, amplifier or properly attenuated transmitter really is.
An input signal in the HF range, as high as 4 Vpp down to 10 mVpp, is fed to the input. The signal is attenuated and passed through a notch filter to attenuate the fundamental signal. All other components (harmonics of the fundamental and undesirable higher frequency spurious signals) are allowed to pass on for measurements. A logarithmic detector then senses this remaining energy in the spectrum and feeds a bargraph display to show the cumulative amount of remaining off-frequency signals.
- Different "transport layers"
VHF -- Little 433 MHz transceiver "modem" boards -- http://www.ebay.com/itm/433-M-Wireless-Transmitting-Receiving-Module-Modulation-Transceiver-XL1101-D01S-/290712483696?pt=LH_DefaultDomain_0&hash=item43afd07770
UHF -- Even smaller 2.4 GHz modem boards http://www.ebay.com/itm/2pcs-NRF24L01-2-4GHz-Antenna-Wireless-Transceiver-Module-For-Microcontr-/251044600998?pt=LH_DefaultDomain_0&hash=item3a736c9ca6
RS-232
Direct wire connect
DC-over-Coax
Tones-over-Coax
Audio Sound & Tones -- PLL repeater control, DTMF control
THE ROOKEY
Remote ON-Off Keying
The Rookey "Decoder" Setup: FM receiver, audio patch cable, Decoder board, ear buds, and the 9V battery. (Battery not included in kit.) |
|
|
The Rookey Kit consists of the audio Decoder pc board and all on-board components, a small FM receiver, audio patch cord, ear buds and an 9V battery clip. The microcontroller IC supplied with the Decoder board is preprogrammed with the BASIC software program that decodes the incoming audio pulses to illuminate any one of the four LEDs. An extra (blank) Rookey pc board is also supplied in the Rookey Kit and is easily modified for use as a mating Encoder board to generate the coded audio signals that would be sent (with a user-supplied FM transmitter) over the "transport medium" of the FM band. Alternatively, the Encoder's audio pulses could be sent to the Rookey using IR, Bluetooth, hf/vfh ham band or ultrasonic transceivers. You could even just connect the Rookey Encoder and Decoder board pair with a long run of ordinary twisted pair wires to deliver multi-function control to the end-point. The Rookey Encoder and Decoder boards use the simple and reprogrammable PICAXE microcontroller, thus allowing you to easily customize the project by changing the codes and adding other features to suite your remote control project ideas. All encoder/decoder software is freely available on this web page. Additional software is available for the Rookey boards, provided by PICAXE-enthusiast David Gwillim, KB2TQX. Dave's programs allow the Rookey board to function as a Randon Morse Generator, Iambic Keyer, Koch Method Generator and a temperature controller. This source code is also freely available here. |
· Actually, "Antenna Matching Units" ...
· Why do we need them?
◦ Modern rigs designed for 50 ohms
◦ Many antennas/feedlines are not
◦ Non-resonant wires
◦ Open-wire feedline
◦ Multiband operation
Fig 15.25 end-fed wire impedance plot
Z-Match Tuner
◦ Fairly simple construction
◦ Easy to tune
◦ Tunes wide impedance range
◦ Balanced or unbalanced
Coaxial Cable
Loss in db per 100ft.
Coax Data Charts ... from N0HR page ... http://www.n0hr.com/hamradio/104/10/ham_radio0.htm
Coax data - attenuation, velocity factor, impedance, OD for various types of coax.
Coax Data Attenuation - db/100 feet Belden # Impedance 100 MHz 400 MHz 1000 MHz OD V Factor 9880 50 1.3 2.8 4.5 .390 .82 This is Thicknet Ethernet cable. Most is marked "Style 1478" and has a #12 solid center conductor and 4 shields (2 braid/2 foil). Attenuation - db/100 feet Belden # Impedance 100 MHz 400 MHz 1000 MHz OD V Factor 9913 50 1.3 2.8 4.5 .405 .82 9914 50 9 .403 .66 8 /U 50 1.8 4.7 6.9 .405 .66 8 A/U 50 9 .405 .66 8 /X 50 3.7 8 12.8 .242 .78 58 A/U 50 4.9 11.5 20 .195 .66 58 C/U 50 4.9 11.5 20 .195 .66 174 /U 50 8.9 17.5 28.2 .101 .66 188 A/U 50 9.8 15.8 25 .11 .66 213 /U 50 2.2 4.7 8 .405 .66 214 /U 50 2.2 4.7 8 .425 .66
Coaxial Cable Power Ratings
Maximum input power rating - Watts at (MHz)
RG/U CABLE | 1.0 | 10 | 50 | 100 | 200 | 400 | 900 | 1000 | 3000 | 5000 |
---|---|---|---|---|---|---|---|---|---|---|
8 MINI,8X | 4000 | 1500 | 800 | 550 | 360 | 250 | 150 | 65 | 50 | |
8,8A,10A,213 | 11000 | 3500 | 1500 | 975 | 685 | 450 | 230 | 115 | 70 | |
9913,9086,9096 | 3500 | 1500 | 975 | 685 | 450 | 230 | 115 | 70 | ||
174 | 1000 | 350 | 160 | 80 | 80 | 60 | 35 | 15 | 10 |
THE PROJECT:
Remote Controlled Antenna Switch
Weatherproof enclosure
Pix of box, overall about 6" x 6" x 4" ...
The old Heathkit SWR bridges ... recall the nostalgia days of building simple kits?!
Wiring the "Retro SWR Meter" ... Ugly-Style!
June 12 ... QRO Power Supplies:
A Homebrew, 13.6V, 10A Linear Power Supply
My implementation ... "DC Power Cube", shown above-left
IN-PROGRESS PROJECT:
Remote Controlled Antenna Switch ... (Continued from previous week's session)
The uM-FPU from Micromega can directly parse NMEA strings ... http://www.micromegacorp.com/umfpu-v3.html
Jupiter-T GPS Receiver Module
G3RUH GPS-DISCIPLINED OSCILLATOR
GPS Disciplined Oscillator, by G3RUH ... http://www.jrmiller.demon.co.uk/projects/ministd/frqstd.htm