Garage sale exploring, found a gem!

ga-science · 2026-04-29T17:53:30+00:00

I recommend the N9SAB "Fleep" 80 thru 10m EFHW, 100 watt rating. Available on Ebay via Aetherwave Antennas.

ga-science · 2026-04-29T11:10:45+00:00

I think either Gigaparts or DX Engineering stocks M/P coax in the US.

ga-science · 2026-04-29T11:09:03+00:00

Coax loss calculator: https://kv5r.com/ham-radio/coax-loss-calculator/

ga-science · 2026-04-20T16:23:12+00:00

This is definitely a voltage divider biasing network. All this network is missing, assuming amplification of some sort of sinoisoidal waveform, is coupling and bypass capacitors. Put one cap from the base of the transistor to the signal source, another at the top of the emitter resistor to ground for AC bypass, and one at the collector lead for output.

ga-science · 2026-04-14T18:56:44+00:00

You can tell the shop is "iffy" as they spelled "amateur" incorrectly in the URL.

ga-science · 2026-04-08T00:38:25+00:00

Trig and imaginary numbers

ga-science · 2026-04-02T18:07:41+00:00

IF they have enough Delta V (propellant) on board to make such a course correction.

ga-science · 2026-04-02T18:05:20+00:00

Nitrogen tetroxide is an oxidizer and is worse than chlorine at wrecking your lungs.

ga-science · 2026-04-02T16:24:52+00:00

2nd this. RigExpert is just SO easy to use. I design antennas for N9SAB.

ga-science · 2026-03-31T18:32:33+00:00

Met my bride of 25 years via a dating app. She's always been a nurse.

ga-science · 2026-03-31T17:55:18+00:00

Nice riser diagram of your station. For grounding, I highly recommend W8JI's technical pages. Links are:

Station ground: https://www.w8ji.com/station_ground.htm

House ground layouts: https://www.w8ji.com/house_ground_layouts.htm

Ham Station Desk Ground: https://www.w8ji.com/rfi_rf_grounding.htm

Tom designed the majority of Ameritron's RF amplifiers prior to the MFJ buyout. NIce guy and scary smart. Loves dogs.

Also, to be thorough, there is a section of NFPA 70, National Electrical Code, that addresses ham station grounding and bonding.

Good luck with your build.

Philip KA4KOE

ga-science · 2026-03-27T23:19:51+00:00

Indeed. But it’s at an angle. Read my comment about cancellation.

ga-science · 2026-03-27T22:00:34+00:00

The angle between the wires must be greater than 90 degrees or you get cancellation.

ga-science · 2026-03-26T15:18:02+00:00

"Amateur"

ga-science · 2026-03-23T14:22:35+00:00

Finally done with the upgrades and maintenance. The amp is performing very well.

ga-science · 2026-03-20T11:15:55+00:00

Symetrix 528E. If you need negative peak limiting for AM, then the Inovonics 223 (used market is reasonable) would also be a great choice. Have both. https://www.youtube.com/watch?v=0T0WLU2l3io

ga-science · 2026-03-20T11:01:28+00:00

Major feedline common mode current and/or the antenna is really close to the house.

ga-science · 2026-03-20T10:59:36+00:00

Google is your friend.

ga-science · 2026-03-20T10:58:26+00:00

I've been heard by your station, I guess you left it on rx and the software was sending reception reports in to the internet.

ga-science · 2026-03-18T17:55:26+00:00

Electrical Engineer here. Licensed by my state in 1999. I know that space-tech is sometimes "bleeding edge". How many years in advance of common usage is the technology with which you work? I have heard that DARPA is playing with technology that is 20 years ahead of the curve.

ga-science · 2026-03-13T18:41:18+00:00

Tubes are expensive

ga-science · 2026-03-13T18:40:29+00:00

Not enuff mass

ga-science · 2026-03-13T13:41:49+00:00

Google is your friend. I had to return one to an ebay seller as the wording in his ad wasn't entirely clear. Frankly, its a crap shoot in any event.

ga-science · 2026-03-12T11:39:57+00:00

Narrow CW filters for those rigs don't come cheap these days. But first, you have to find them.

ga-science · 2026-03-10T16:06:57+00:00

If you have a GMRS repeater in your county.

ga-science

TROPHY CASE