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Old 16th Feb 2021, 10:57 pm   #23
G0HZU_JMR
Dekatron
 
Join Date: Sep 2010
Location: Cheltenham, Gloucestershire, UK.
Posts: 3,077
Default Re: PIN diode band switching yaesu ft-767

Quote:
so should I stick with the Iss83, may as well replace the lot while the board is out, its not like Im paying for my time
I've never worked on one of these radios or played with an ISS83 diode so I can't really say for sure. However, other people on the thread suggest that these 1SS83 diodes are unreliable and you should replace them all.

I'm not sure what you should replace them with though. There's a lot of diodes so you really only want to have to do this once...

I still don't know why the 1SS83 diodes are unreliable. Maybe they can get toasted if high RF power gets into the antenna/receiver from another HF transmitter/antenna at the same location? 1N4148 diodes are very rugged and very cheap but the manufacturer still doesn't fit them as standard.

Did you do the sig gen test to see how deaf the receiver was on the MW band?
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