Good evening from chilly Southwest Florida
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I've run into an issue with a relay I wired into an adjustable attenuator board.
The PTT signals coming from both my QMX HB Rev2 and my QDX LB rev 5 aren't sufficient to keep the relay pulled.
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Completely my bad.
I tested my chosen relays on a breadboard and used 5V from an Arduino Uno to confirm I had the correct pinouts and where to tie into the attenuator board (QRPKits - 41dB selectable). Nice solid pull-ins and signals attenuated when expected.
I didn't test with the actual PTT Voltage and current available from the Q's until I had everything tied in.
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I vaguely remember see somewhere that it may be possible to make more +5v current available on these units.?
Hoping someone can confirm that and give me an idea where the find messages/information. And what pitfalls I might run into if there are mods for use with QPR 50W amps that I have.?
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The relay is an HK 19F-DC5V-SHG.? It needs about 0.2W to feed the approximately 125 Ohm coil.?
On the Q's there is no solid, clearly audible relay click-in with PTT but there is faint click when dropping PTT.
I see about 1.8V across the coil when PTT is asserted.
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Thanks in advance,
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GREG KI4NVX
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