Category Archives: General

Articles about Amateur Radio and the Nashua Area Radio Society. This is a general category which includes most articles on our website.

2016 NEQP Report from N1FD/M

We operated as N1FD/m (Mobile HF) in the New England QSO Party (NEQP) this past weekend. We began our operation on Saturday afternoon on the Massachusetts – New Hampshire State line where we activated two counties and two states.

N1FD/m (Mobile HF) New England QSO Party Multi-Op Team
N1FD/m NEQP Multi-Op Team

We entered the 2016 NEQP Contest in the High Power Multi-Op Mobile HF Category. We operated using SSB phone mode mostly on the 20m and 40m bands. Wayne AG1A, Jamey KC1ENX, and Fred AB1OC were the operators. We took turns operating, driving and navigating. We used Fred, AB1OC’s mobile HF station in his truck.

Mobile HF QSO Party - CQ NEQP from N1FD/m
CQ NEQP from N1FD/m

We operated Saturday and Sunday for nearly the entire contest period. We spent most of our time calling CQ and we had several nice pile-ups to work.

Mobile HF QSO Party - Counties Activated by N1FD/m in the 2016 NEQP
Counties Activated by N1FD/m in the 2016 NEQP

The map above shows the counties in Massachusetts, New Hampshire, and Vermont that we activated during the contest. Anita, AB1QB helped us to create a route of counties to activate which included some of the more rare counties in Vermont and New Hampshire.

Mobile HF QSO Party - Operating On a County Line in Vermont
Operating On a County Line in Vermont

We tried to focus on activations where we could be in two counties as once. These activations produced some nice pile-ups for us to work.

Mobile HF QSO Party - Operating On a County Line in NH
Operating On a County Line in NH

We parked on county lines with 2 wheels of N1FD/m in one county and 2 wheels in another. This gave us two QSO points (one for each county) for each contact that we made.

Mobile HF NPOTA Activation - Marsh-Billings-Rockefeller NHP in Vermont
NPOTA Activation – Marsh-Billings-Rockefeller NHP in Vermont

We also activated two National Parks along our route as part of ARRL’s NPOTA program. We activated Saint-Gaudens NHS (NS60) in New Hampshire and Marsh-Billings-Rockefeller NHP (HP26) in Vermont. The HP26 activation produced the best response – we made about 50 contacts while we were there.

Mobile HF QSO Party - Solar Weather for NEQP 2016
Solar Weather for NEQP 2016

We had a few challenges along the way. We had some antenna related problems with our Mobile HF setup to deal with. Fortunately, we had some spare parts with us and we adjusted our operating style to overcome them. We also had to operate through a major solar event on Sunday. This made contacts very difficult but we still logged over 235 QSOs that day in spite of the conditions.

Mobile HF QSO Party - Wayne, AG1A Operating in NEQP 2016
Wayne, AG1A Operating in NEQP 2016

All in all, we had a great time in the contest. We logged a total of 631 QSOs and we worked 58 Multipliers. Our claimed score was 36,598 – not bad given that this was our first entry as a mobile and our first time in NEQP. We worked 43 of 50 states and we had quite a few stations from Canada and Europe call in to answer our CQs.

There was some discussion on the way home about the Maine and New Hampshire QSO parties which will be held later this year. We hope to be N1FD/m again in one or more of those as well.

The N1FD/m Multi-op Team,

Fred (AB1OC)
Wayne (AG1A)
Jamey (KC1ENX)

KB1OIQ – Andy’s Ham Radio Linux download on SourceForge.net

KB1OIQ – Andy’s Ham Radio Linux download. KB1OIQ – Andy’s Ham Radio Linux CD free download. KB1OIQ – Andy’s Ham Radio Linux Ubuntu Linux remastered for Amateur Radio users

Source: KB1OIQ – Andy’s Ham Radio Linux download on SourceForge.net

Andy attended our Club Meeting on Tuesday, May 4th to talk with us about using Linux and various HAM Radio applications which run on it. The page mentioned above contains links to Andy’s Linux HAM Radio files. You can see a copy of Andy’s presentation here.

Rig Audio Interfacing and Low Cost PC Headsets

First I want to promote some excellent papers on rig interfacing and grounding produced by Jim Brown K9YC.  There is a wealth of information there, produced by a very talented and experienced engineer.

Now…on to the topic of interfacing PC headset to ham rigs…

Heil Headsets get a lot of support and advertising in the amateur community.  But they are expensive.  The W2SZ VHF/UHF contest group that I belong to uses mostly Heil headsets, so I have a lot of experience with them.  The problem is that a lot of them are broken.  We only use them two weekends a year for about 36 hours but they fail in a variety of ways.

I don’t own a Heil headset (I’m too cheap), but wanted a more reliable headset for my own use on the mountain.  In this case, reliable means I can bring several for a reasonable price.  So, this led to a series of experiments with PC headsets that are available for prices that range from about $13 to $50.

PC headsets and Heil headsets operate differently.  Heil headsets use a dynamic microphone and cannot tolerate any DC current through the microphone.  PC headsets require a DC bias voltage to operate their electret microphone.

The diagrams below (copied from a great presentation on rig interfacing by AudioSystemGroup)  shows the two ways a PC puts electret bias on the ring terminal of the 3.5 mm microphone jack.

Rig Audio Interface Schematic

All PC headsets have the ring terminal for bias…that is the key to this design.

Rig Audio Interface Schematic

The box below takes 8 volts from the ICOM microphone connector and uses it to power the PC headset.  The circuit has…

  • 3.5 mm (1/8th inch phone) jack for the microphone
  • 0.47 uFd series cap on the microphone, pass audio and block DC
  • 2.2K resistor to pass DC from the 8V pin to the ring terminal
  • 1/4 inch phone jack for rig keying
  • Cable and ICOM microphone plug

Rig Audio Interface Circuit

Rig Audio Interface Circuit

It was important to ensure the Heil headset doesn’t see any DC if plugged into the microphone jack of this adapter.  The design put bias on the ring terminal to feed the PC headset.  But, the Heil microphone connector does not have a ring terminal so it simply grounds the bias voltage… so, no bias gets to the Heil.   The dynamic microphone in the Heil couples audio through the series cap.

Here’s another design.  This one has two 3.5 mm connectors, one jack, one plug plus a battery.  The battery supplies power to the PC headset without the need for power from the transceiver.  This also supplies power to the ring terminal and block DC to the microphone on the tip terminal.  This took about 5 minutes, the components are under the tape.

Rig Audio Interface Circuit

One of our W2SZ members, Tom Price KC2PSC, designed of a PC board to implement this idea.

  • RJ-45 connector for rig microphone interface
  • Converts to 3.5 mm microphone and line out
  • Converts 1/4 inch phone for rig keying
  • Includes option for battery

Rig Audio Interface Circuit

There are a number of web sites that discuss the same thing

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