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 AT 5555N weird mic wiring issue

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26uk81
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Call Sign : 26UK81
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Join date : 2020-06-06
QTH or Location : Oxford
Equipment Used : ss 6900N, AT5555N, President McKinley
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AT 5555N weird mic wiring issue Empty
PostSubject: AT 5555N weird mic wiring issue   AT 5555N weird mic wiring issue Icon_minitimeFri Mar 12, 2021 4:16 pm

Some of you may have seen in "information and guides" how I got the channel buttons on my Adonis M308 working with this radio.    The channel down button bridges the channel select common to the TX wire via a 2200 ohm resistor, and channel up does the same thing with an 11 ohm resistor.   When I wired up the Adonis mic, I nicked the resistors from the stock mic and wired them into the mic connector.  Channel select works just great on the Adonis.

I photographed the resistors so that I could order some for the stock mic and replace them.   Got a new 2200 ohm wired in and channel down works.   However any 11 ohm resistor I try just seems to create a dead short, ie. when you press ch. up, it acts as a TX key, rather than changing the channel.   The original is definitely an 11 ohm, I checked it with a multi meter as well as checking the stripes on a resistor calculator tool online.   The new resistor colours match up.   They are rated for 1/4 of a watt, which surely is fine for a simple push button circuit.    The 2200 is only that I think.

It's not a big issue for me really as I don't plan to use the stock mic but it's something which is bugging me and teasing my curiosity.  It would be good to find out what the issue is in case I want to wire up any other mics with channel buttons.   Does anyone have any idea what is so special about the 11 ohm resistor which I took out of the stock mike?
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DAVE_R
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AT 5555N weird mic wiring issue Empty
PostSubject: Re: AT 5555N weird mic wiring issue   AT 5555N weird mic wiring issue Icon_minitimeTue Jan 11, 2022 11:10 am

They could be 11uH chokes...
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