Friday, March 13, 2015

Larkfield ARC and LIMARC meeting presentation Handout

Here are the links from the handout:

Heathkit FAQ

Quicksilver (soldering iron, tools)

The Ham QRP DIY Kit Shack

Bitx kits from India


Clifford Wareham



Peaberry SDR

Mikes Electronic Parts (AM chips and Fahnestock clips

Evil Mad Scientist

Great list of remaining surplus suppliers


Peebles Originals (Crystal and Regen kits)

Here are a few more useful links:

I was talking about the 3-lead AM radio chips, and also a source for Fahnestock clips and other AM radio parts.  It turns out that it's the same guy:

Mikes Electronic Parts

This is the site that has the giant 555 IC timer kit that we saw at the meeting:

One man's obsession with crystal radios.  Worth a look!

Great list of remaining surplus suppliers:

Just found this site which has archives of Elementary Electronics, Popular Electronics, Radio Electronics, etc etc.  Great resource!

Here's another interesting kit source I forgot about that I need to add.  Peebles Originals.  They make a nice line of Crystal and Transistor radio kits:

Unfortunately I was not able to find the generic p-boxes, but you can still build the designs on a regular perf board.

 Be sure to send anything new you find that is not on the website to me.

Neil Goldstein W2NDG

Wednesday, January 14, 2015

Alternative Operating Systems. LIMARC Presentation from January 14, 2015

Alternative Operating Systems
Limarc Pre-Meeting presentation
January 14, 2015


Atheos (Syllable)
MorphOS  For OLD PowerMacs


Tuesday, January 06, 2015

Linux For Ham Radio - Ham Radio University Forum - HRU 2015

Welcome to all HRU attendees, and visitors to this website.  I would like to thank HRU for inviting me to be a presenter this year, and also to everyone who attended my forum.  Here are the notes I promised, as well as a link to the presentation.  This subject really requires more than the 45 minutes we had.  I had wanted to demonstrate my RTL-SDR dongle running in Linux, and to spend a little time explaining the best way to set it up.

If any metro-area Ham Radio clubs would like me to do this presentation for them, please contact me at: W2NDG(AT)ARRL(DOT)NET.

First of all, lets look at some of the main subjects from the presentation.

Here is a link to the small presentation

Wednesday, August 27, 2014

Tecsun PL-880 Hidden Feature Chart

Here is a consolidated version of the Hidden Feature List for the Tecsun PL-880.

Thanks to Thomas over at The SWLing Post for publishing all of the hacks in one list.

Function Key What to do Radio State
Synchronous Detection USB/NORM LSB/NORM Hold button in until change occurs. One push to change back. ON
Muting Threshold for AM/SSB, also sets FM Threshold on some versions 9 Select mode to adjust first (AM, SSB, FM). Press and hold, then adjust with either tuning knob. Press 9 again when done to save. ON
DNR (Automatic adjustment of bandwidth, etc?) 6 Press and hold till display says 'ON' and again for 'OFF'. ON
Display Firmware Version, and date AM/BW With radio OFF: press and hold until display turns on. Then press and hold again to get firmware. Press one more time for date OFF
FM De-emphasis 5 Press and hold to toggle between 75 (USA) and 50 (Europe) ON
Line-Out Level (only works on FM?) 7 Press and hold till current level begins flashing. Adjust with either tuning knob. Press again to save ON
Adjusting Seconds on Clock 8 With radio off, press and hold, and then adjust seconds OFF
Calibrating on AM (MW) Snooze Tune a strong MW station. Turn on SSB mode (USB/LSB). Move fine tuning till zero-beated and pitch matches non-SSB. Press and hold the snooze button till correction value appears in display, then press snooze again to save. ON
USB/LSB Calibration 0 PRESS and HOLD the 0 button. Look at the UPPER RIGHT corner of the display. A 2-digits number is BLINKING as well as the Hz digits of the tuned frequency. RELEASE the 0 button, and adjust the FINE TUNING. Tune, de-tune and re-tune before calibration is perfect. Play a bit with it to understand how it works. Change is effective AFTER you press 0 again. Do for both USB and LSB modes. Check the tone when tuned to xxx.95 USB and xxx.05 LSB. They should sound exactly the same. ON
Forcing External Antenna on MW/LW Several Visit for instructions and video ON

Tuesday, April 22, 2014

Ramp Season (with a recipe)

It's that time of year again.  Ramps are rampant in the woods (sorry).  For those of you that don't know what
Flickr:Jessica and Lon Binder
a ramp is, the pictures here will help you identify them.  They are the wild relative of the cultivated leek that springs up in the Northeast towards the end of April.  Usually growing in moist woods.  If you know of a place where there is a lot of skunk cabbage, chances are that there are ramps nearby (usually a short distance in the opposite direction of the wet area that the skunk cabbage is near).  Pull the whole plant out by digging underneath it a bit, and you'll have something that resembles a lily of the valley on top, and a scallion on the bottom.  It should have a nice, pronounced garlicky-onion odor.  Drop these in a bag as you harvest, and try not to take too many from one area.  I usually bring a cooler to put them in once I get back to the car to keep them fresh until I can prepare them.
Ramps in the woods. Flickr:Bev Currie

To prepare, cut off the small roots along with the bottom eighth-inch or so of the bulb.  Strip the outer layer or two of the translucent skin off and throw in a colander.  Wash thoroughly in cold water.  Then, chop the ramps into small pieces, tops and all, and re-wash in the colander in cold water.  You are now ready to prepare.

You can use them as you would leeks, with obvious consideration to the size difference, and the addition of an almost greens-like vegetable with the tops intact.  One popular use is in omelets.  I use them in place of the leeks in my leek latkes:

-A bunch of ramps, chopped into 1/2 inch pieces at the top, and smaller near the bulb.
-Almond meal (this makes them a bit healthier.  You can use bread crumbs instead.)
-Salt and Pepper
-Olive oil
-Frying oil

I use Trader Joe's almond meal.  Best for the dollar I think, and I usually saute the leeks in extra virgin olive oil, and fry the pancakes in regular olive oil, canola, or Trader Joe's rice bran oil.

Saute the prepared ramps in some olive oil until limp and fragrant, set aside to cool a bit, and wash the pan out for the next step.  Once they are just warm still, add a few eggs.  I had about 8 cups of chopped ramps to start with and used 3 jumbo eggs, so use your best judgement here.  You can always add more, so start low.  Mix well till the eggs are beaten, and add enough almond meal to make a thin pancake-consistency batter.  I think I ended up using about a cup this last time.  Add salt and pepper, and mix well.  Drop batter from a large serving spoon or ladle into hot oil (see above) and cook until golden brown on both sides.

These are fantastic as is, or with some sour cream, and/or applesauce.

I think next I'm going to try them in this recipe.

Happy foraging folks!

Wednesday, November 13, 2013

LIMARC Linux Presentation 11/13/2013

Link to the presentation files:


Site for Distros:

Debian:  Volunteer maintained.  Uses the popular apt package system used as a base for many other Distros

RedHat:  Commercial.  Used by large corporations, governments, and schools. Related to Fedora (open source branch), and CentOS (free version).  Uses the rpm package system
  Why pay?  SUPPORT!

Slackware:  One of the oldest. Not for beginners

Ubuntu:  Based on Debian.  Very popular, and used on some commercial desktops.  Easy to install and use.  Recently headed in a direction that alienated many users. 

Linux MINT: Evolved from Ubuntu. Much more polished and usable.  Keeps a more conventional desktop like Ubuntu used to.  Better out-of-box-experience.

Puppy:  Lightweight, and fast.  Great on older systems.  Has own proprietary packages, but some versions support Ubuntu, or Slackware packages.

CentOS:  Built from RedHat source.  Essentially RedHat without support

FreeBSD:  Not Linux, but UNIX.  Worth a look for comparison, but I recommend GhostBSD for beginners.  OS X, and iOS are based on BSD variants

GhostBSD:  FreeBSD for beginners

Damn Small:  Started the mini distro movement.  Always less than 50M

Tiny Core:  Full GUI operating system in a 14M download. Amazing!

Multimedia:  OpenElec, XBMC, GeexBox
  Make your own ROKU. 
  OpenElec and XBMC run on the Raspberry Pi

Security – Forensics:  Kali, BackBox
  Recover files, test network security.

Disk Utilities:  Parted Magic, Clonezilla
  Free alternatives to Partition Magic and Ghost
  Hirens Boot CD includes both

PBX (phone systems): AsteriskNOW
  Make your own phone system

Ham Radio:


Live CD/DVD:
  boot from CD/DVD.  Does not touch your operating system!
  Can install later
  There’s one on HIRENS

Install into VM:
  VirtualBox, Parallels, VMWare

Install on an older computer

Make a bootable USB

Install to USB
  Use a large USB stick, and a live CD/DVD


Linux Mint MATE 32 bit
Linux Mint MATE 64 bit
CentOS 32 bit
Puppy LUPU
Or, download your own ISOs and burn

Thursday, October 24, 2013

The Spectrum Monitor - Picking up where Monitoring Times is leaving off!

Great post by Thomas over at The SWLing Post about a new e-magazine that is being published by former MT managing editor Ken Reitz.   Read all about it here.  Thomas will also be contributing to the new publication, which is a good thing, since he has what is arguably the best SWL blog online.

I can't tell you how glad I am that someone is picking up where Bob Grove left off.

Sunday, September 22, 2013

Nissequogue River State Park QRP expedition

I’ve been to this creepy state park several times since moving to Long Island.  Why creepy?  Mostly the abandoned buildings from the previous tenant on this property; The Kings Park Psychiatric Center.  So, crumbling scary buildings, and a great view of the Nissequogue River Inlet?  Is there a better place for a Sunday afternoon QRP outing?  I think not!

While I was here last time, I spotted a great spot for a QRP setup.  At the top of the long hill, and past the courtyards is a nice grassy area that terminates at a fence at the top of a 40 foot cliff over the water.  There are a number of trees for antenna hoisting, two picnic tables, and a great unobstructed view into the inlet and the Long Island Sound beyond.

I set up on one of the tables, and raised a vertical antenna high into the nearest tree using my twine and water bottle/counterweight, and later I put up a nice high end-fed.  I’m using a Xiegu X1M radio, with an Emtech XM-2 tuner.  Along with the main components are a small amplified speaker, mic, key, different counterpoise and/or ground methods, a 7″ Android tablet, and a portable jumpstart battery for power.  It was a perfect day.  I made 6 phone contacts with 5 Watts on 10, 15, and 17 Meters.  UK, Scotland, Mexico, Italy, The Azores, and Austria.  Not bad.  The weather was great, and I only got a few funny looks from walkers, bikers, and dog walkers as they heard me speaking into the mic.  The ghosts of patients past left me alone too.  One nice surprise was that there was an Optimum Wifi hotspot somewhere nearby, with enough signal to get me online without using my phone as a hotspot.  Great for QRZ lookups.  I have an Empire Park Pass, so admission was free, although I’m still amazed that they charge people to walk around this strange place.

Here’s a few pictures of the setup:

Thursday, September 12, 2013

The long awaited Redsun RP3100

Jeff over at Herculodge has a posted info about the availability of the long-awaited Redsun RP3100.  For those of you who do not know what this is, it is basically an updated version of the Kaito KA2100 / C Crane CC Radio SW / Grundig S450DLX.  Updated with built-in SSB (no more clunky adapter) and what looks like many more features.  This radio has been spotted so many times over the last 5 years that we were starting to regard it as a SW Hobbyist's BigFoot.

Here is a translation of the web page located at:


Click to enlarge view!  !  !
  Product Category: Professional digital radio Product Name: RP3100
  Goujia: 650 yuan (includes postage) Appearance Patent No.:
  Product Features: High performance wide-band digital FM radio
 Features:■ Using the microcontroller (MCU) control, can control the display radio 
frequency, electronic time, radio received signal strength in different states.
■ The machine uses a large number of high-quality high-performance 

integrated circuit chips and other electronic components, with the 
composition of the electrical performance of the radio 
    channel, with high sensitivity, anti-interference ability, background, low 
noise, low distortion characteristics.
■ The machine is divided into four bands: FM range: 87.00-108.00MHz; 

longwave range :150-519kHz; MW range :520-1710 kHz (10k
     system) / 522-1620 kHz (9k system); shortwave range: 

1711 - 29999kHz.
 FM accuracy up to 10kHz, amplitude accuracy of 1kHz.
■ using a power-down feature to protect data memory (EEPROM), 

up to 1400 stored radio stations, including 400 ATS mode
     stored station, store another 1000 having single or multiple (up to 100) 

copy, delete, etc. editing functions.
■ with a wireless remote control, easy to use.
■ normal temperature (0 ℃ -50 ℃) display.
■ A variety of tuning modes: manual tuning radio automatically 

tunes radio stations and scan the storage radio frequency directly 
enter the station and other means.
■ Set FM and shortwave external antenna jack for remote receiver, 

you can also connect to local FM Cable Radio Network (CABLE FM).
     Wave set up a separate 500Ω external antenna / ground port, 

you can use an external antenna and ground to improve MW 
reception capability.
■ with FM stereo, AM SSB reception.
■ Setting the AM IF output can be used to extend the AM band other 

functions such as: CW (amplitude newspaper), SSB (single sideband), 
DRM (tone
     amplitude digital broadcasting), SSTV (Slow Scan TV) and so on.
■ AM take double-conversion PLL technology (IF 1 = 55.845MHz, 

IF 2 = 455kHz), 
has a very good anti-imaging capabilities, shortwave superior
     to 40dB (100 times), medium wave better than 60dB (1000 times).
■ modulation using FET balanced mixer, high-frequency octave band pass 

filter using, strong anti-interference technology, the AM has very good
     anti-jamming capability.
■ Ad hoc MW / SW Selectable wide / narrow IF bandwidth, but also 

according to the strength of the broadcast signal to adjust the high 
amplifier gain (RFGA-IN), to get the
     best reception.
■ Digital knob (fast / slow / Lock) tuner radio frequency, with a 

convenient, fast function.
■ Dual timer beeps, boot Alarm function, countdown Alarm function, 

snooze function, programmable sleep timer function. 
Timer Start frequency
     setting function.
■ key tone function selection key lock function.
■ Setting the left / right channel line / input / output jacks. 

Can put the machine as a tuner, connect stereo amplifier, 
for better reception.
     The machine can also be used as the player, connect the 

external input audio signal.
■ optional 5-inch high-quality speakers and BTL audio amplifier IC, 

set up a separate high and bass adjustment knob, the use of 
different sounds to meet
     the color requirements.
■ display with backlighting, you can manually choose light / 8 seconds 

lights out two kinds of illumination for night operation.
■ You can use an external AC power supply (220V) / external 

DC power supply (6-9V) / 4节R20 (large battery) / 4 AA (5 batteries) 
Battery four kinds of
    mode power supply, rechargeable battery rechargeable function.

  Previous: Super-three multifunction military radio RP007
  Next: No

Wednesday, September 11, 2013

QRP: More fun than a barrel of microphones

I have been slowly getting into QRP these days (low-power for you beginners).  Being an outdoorsy kind of guy, it mixes well with my outings.  What has really surprised me lately though, is how well you can do with some inexpensive equipment, and a simple antenna. 

Most of my portable setup is relatively inexpensive.  For a radio, I am using a Xiegu X1M.  I paid around $300 for the radio, which is shipping in a newer version now (the platinum model) from Import Communications for $349.  The Xiegu is a general coverage receiver (100Khz-30MHz) with the ability to transmit 5 Watts SSB & CW on 80, 40, 20, 15, and 10.  It will transmit on other bands, but not cleanly without some external low-pass filters.  It’s also far from a perfect rig, being in the early stages of development.  It seems at times that the early adopters are actually beta-testing this rig for the manufacturer.  Most of the problems though can be corrected through some self-alignment using the menus, and those that cannot be corrected yet are all related to CW mode, which I am not currently using.  Even with the shortcomings though, I have had a lot of fun with this li
ttle radio.  I’m not here to necessarily recommend this model to everyone, but the tinkerers among us, looking for a TINY rig with these capabilities will enjoy the Xiegu.  There are other choices, which I’ll cover later, but first the rest of my setup.

For a tuner, I did a lot of reading and research.  I wanted something light, small, inexpensive, and with lots of positive reviews.  The Emtech ZM2 fit the bill perfectly.  This little tuner seems to be able to quickly tune up anything from my wire-in-the-trees setup, to a 4-drawer file cabinet.  It  handles up to about 15 Watts, and is available with either SO-239 or BNC connectors, and in kit form ($65), or assembled ($90).  Either model also has binding posts for balanced input.  Available from

For power, I’m currently running the radio off of the car.  I have a nice coiled extension, and I just plug in to the rear 12V jack in our Kia Soul.  I am planning on getting something more portable.  The radio seems to be sensitive to low-voltage and has issues with anything under about 11.5 volts, so I’ll probably go with a 24V dual-battery setup with a regulator.  For now, I’m happy just tailgating. 

My antenna is a stiff piece of solid wire, about 7 feet long, which is attached to about 50 feet of stranded 16 gauge wire.  I raise the antenna vertically in a tree using the water-bottle-and-cord method.  I tie the cord to the water bottle, which is about ⅔ full, and heave it at the top of a sturdy tree, allowing it to fall down the other side, and draw the cord up into the tree.  I then pull the cord back until the water bottle is at its highest point, attach the wire, and let gravity raise the wire into the tree.  When finished you just untie the cord from the bottle and pull it all back out from the antenna end.  I usually have a 10-20 foot counterpoise heading in an opposite direction from the ZM-2 tuner.  This setup allowed me to tune up on 10, 15, 20 Meters, as well as 17, and 12, but as I mentioned earlier, the Xiegu needs some extra filtering there.

I have a small straight key, just for tuning up, a small amplified speaker (the volume is a bit weak on the Xiegu for outdoor use), stock microphone, and I usually keep the laptop nearby feeding off the WiFi hotspot on my phone for QRZ lookups, and logging.  Most of this fits into a foam lined case that I picked up at a yard sale recently for $1.

How does it perform?  This was the way I setup the rig this past Saturday up in back parking lot in West Hills Park, off of Highhold Drive, which is near the highest point on Long Island (Jaynes Hill).  The Parking lot sits at about 360 feet above sea level (as determined by an app on my phone, so I wouldn’t use that number for surveying).  I worked stations in Denmark, Germany and the UK on 15M, and another Denmark station on 20M.  Not bad for 5 Watts. 

What options are there in QRP Sideband rigs?  Well, for you big spenders, there are the current popular models.  The Yaesu FT-817nd, the Elecraft KX3, and the TenTec Argonaut IV.  The Yaesu can be had for $650 after rebate right now, which is a pretty good deal.  The Elecraft and the TenTec are both around $1000, depending on accessories.  The Elecraft is a personal favorite of mine.  I hope to own one at some point. 

The Xiegu, as I mentioned is currently around $350.  There are a couple of new options coming in the next month or two that are similar in size and performance to the Xiegu.  The YouKits TJ-2B MK II is due the end of this month.  The MK II is an updated version combining the best bands of the two separate MK I models.  The MK II will cover 60, 40, 20, 17, and 15 Meters with 5 Watts, and costs $329 assembled on a special pre-order deal, with a free battery.  I’m thinking that I might have waited for one of these if I had known.  They usually offer a kit version with all SMD parts finished for $50-$75 less. 

LNR Precision, the company that currently owns the excellent Par EndFedZ antenna line, is about to release it’s QRP sideband rig, the LNR-FX4.  This rig will transmit on 40, 30, 20, and 17 Meters with 5 Watts.  It looks TINY in the photos.  LNR says that it will sell for less than $500.

For those of you that like to say “I built this rig, and have the burn scars to prove it!”, there are a few other options as well.  Hendricks QRP kits offers the BitX20A, BitX17A, and Survivor 75 Rigs.  Hendricks radios are always highly regarded and sell for between $100 and $200 depending on options. in the UK offers the MKARS80 SSB Transceiver.  This kit is based on the same design that is used in the BITX20 from Hendricks, but modified for 80 meter use. Covers from 3.5 to 3.8 Mhz with about 5 Watts output.  Ranging from a basic no-case kit for £55.00 shipped to the USA, to full kit with connectors, knobs, and an undrilled case for £68.50 (Pounds)

CR Kits from China, sells the KN-Q7a for $120 plus shipping ($45 more assembled).  5 Watts output, available in several 40 and 20 meter ranges.

Walford Electronics in the UK, sells several SSB and DSB (SSB compatible) kits in various level of difficulty.  I like this guy's website, as he explains each rig in depth.  Check it out!

EA3GCYvfrom Spain sells the ILER line of SSB kits.  These rigs have been reviewed well, and are inexpensive, and expandable.  Available in a couple of frequency ranges in 40 and 20 meters, they sell for €77.50 (Euros).  This might be my next project.  Looks fairly simple, thru-hole construction.

There's also the SDR kits from Tony Parks, although at 1 Watt output, they would be more of a challenge.  Tony is selling them assembled too these days (when available) on his website, as well as a nice little enclosure.

These kits, as well as others can always be found at my Radio Kit Guide directory at

There’s a guy who writes for (Larry W2LJ) who closes his posts with the line:  QRP - When you care to send the very least!  

Enjoy all.  73.

--Neil W2NDG