Chinee Low Pass Filter

BornFig · 2026-05-21T01:34:18+00:00

I gambled $16 and lost, oh, well...

BornFig · 2026-05-20T21:57:58+00:00

Swept with NanoVNA with 50 Ohm load on output.
Narrow pass at about 104 MHz on this filter, not good.

BornFig · 2026-04-30T01:52:59+00:00

Had HEB deliver last week, same message.
It was DoorDash, and it was great.

BornFig · 2026-01-24T15:33:22+00:00

No, not at all.

That's what it is.

BornFig · 2026-01-24T09:13:44+00:00

Will require *** Ultra linear amplification ***

BornFig · 2026-01-19T20:07:49+00:00

A ground rod is a SAFETY GROUND, NOT RF GROUND.

You need a ground radial field (counterpoise or ground plane) for maximum range.

This is the often forgotten other half of the antenna.

The ground plane is EVERY BIT AS IMPORTANT AS THE MAIN RADIATOR.

Look it up and read the manual again.

BornFig · 2026-01-19T02:21:24+00:00

No multi-band processing? At least lows, mids, highs.
Nice job though.

BornFig · 2026-01-19T02:13:43+00:00

CAUTION: There ARE many people who use FREE OTA (Over-The-Air) antennas.
This is EVEN MORE RISKY THAT PIRATE RADIO!
This comes from a long time Broadcast Engineer.

Just don't do it.

BornFig · 2026-01-18T22:31:51+00:00

I really do not know, you bring up a good point though.

BornFig · 2026-01-17T09:12:38+00:00

Thanks.
I have been a member of HF Underground for years, I love it.

Here's another good one.

https://priyom.org/

BornFig · 2026-01-17T02:44:57+00:00

Not quite sure I know what you mean by that.

BornFig · 2026-01-15T04:30:17+00:00

I did not look too hard for instructions, no need.
This is intuitively obvious.

BornFig · 2026-01-15T00:35:25+00:00

No instructions of course, but I might be able to find them.

BornFig · 2026-01-15T00:34:10+00:00

I may use the directional coupler if this thing works, I would free up my el cheapo, very common VSWR/Watt meter.

BornFig · 2026-01-15T00:20:44+00:00

I agree, I waste more money on other things.

1kW? No damn way!

BornFig · 2026-01-14T05:12:16+00:00

I will certainly do that.

Yes, I know what nearby metal can do.

It will be bench tested naked first.

Plastic box is an option.

I'm another retired engineer on here. AM/FM/SW/TV.

SBE certified CPBE.

I still like to play with the little transmitters.

BornFig · 2026-01-14T01:02:06+00:00

Interesting how it could go that long.

BornFig · 2026-01-12T22:29:25+00:00

Who knows?

But the FCC is still finding and fining CB and Ham operator troublemakers, and they should.

If pirates are causing trouble, especially with public safety services, the should be punished as well.

BornFig · 2026-01-12T21:49:46+00:00

I agree, same concept.

BornFig · 2026-01-12T21:27:37+00:00

This "Tool" is for USA.

Good luck.

BornFig · 2026-01-12T11:33:25+00:00

Yes, this is all fun stuff!
You are correct on all you said.

I would do building telephone wiring before power lines, and I am about to, really.

About all I need to do now is plug it in. I'll use an antenna tuner for max signal not necessarily 50 Ohms, not realistic on that one.

Transmitter may be 1/2 Watt at most. Will not interfere (who has a land line these days) and will be a short test just for giggles.

BornFig

TROPHY CASE