Recent content by sp5it

Easy way to use socket which disconnect internal meter when the other is connected. I've done it many times in different radios. Mike

For 30+ years technology? Bollocks.

From my old database: Find jumper J2, you will notice that it is on pins P3 and P4 If you remove it you will have coverage from 26.000-29.700 MHz If you place it on pins P1 and P2 you will have coverage from 26.000-32.000 MHz Now reset the CPU by pressing the button below J2 To get a channel...

Be careful. Mic socket is connected directly to the processor. One mistake connecting other mic and cpu is fried. Later they added transistor buffer. Mike

Could you measure their capacitance and post the result? Thank you. Mike

If you just ground pin 10 radio will go up one band. No other mods needed.

Pin 10: Ground goes up 64 Pull high - goes up 128 The rest here: https://www.worldwidedx.com/threads/l21-frequency-mod-for-mb8719.234452/

Thanks Crawdad, but antenna already there. Peak Gain for 21m above ground [dBi]: 17,17 Peak F/B for 21m above ground [dB]: 30,7 Peak Gain for free space [dBi]: 11,4 Peak F/B for free space [dB]: 30,9

Hi. Recently I bought two aluminium 24m towers for peanuts. First project is six element for six. Top element with rotator mount completed. Second project is 27m vertical for 80m. Around 400-500 radials, depend on my patience. Will be ready for winter season. Mike

Ehm.. Just wanted to mention, that resonance usually does not follow lowest SWR :)

That bias is just resistor providing bias voltage or temperature compensated bias circuit as it should be done? :cool: Mike

All of above are C-class splatter boxes, good for FM only. Those builders still didn't learn how to build proper SSB/AM amplifiers? Mike

You don't need Phantom power for this mic. I would rather add RF speech processor. Mike

Switch off monitor

Where can you put the antenna? Roof, ground, tower, mast, city, countryside, HOA, how much land for antennas... ? Mike