Re: Audio in speakers during Tx
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Mice,
?I had these experiences that old? Inveterted audio electronic telephones instruments called secraphones installed for VIPs? close to Radio Transmitters? used to misbehave. ?We immediately used to have a capacitor across the Mic module and telephone line Inop=put close to active components to byepass RF. ?You are right that even 1000pF would do. ?But afterall the audio at Volumen control point is coupled with 1 to 5uF capacitors. ?hence i thought even 0.1uF would not deteriorate audio.? The induction could be internal to amplispeaker also and thro power mine that powers the ampli speakers. ?Thu8s? I suppose that byepaasing audio at volume cotroll stage is better.
?regards
?sarma
?vu3zmv
??
On Wed, Feb 7, 2018 at 8:53 PM, Michael Hagen <motdog@...> wrote:
Might try looping lead
(leads?) to amp thru a ferrite, or get the split clamp on
ones, close to were it goes in the amp?
Wrap up in a coil any
extra length of the cable.? Makes a common mode choke.
As Sarma says, maybe a
100 - 1000 pF bypass on each input?
73's
Mike, WA6ISP
On 2/7/2018 6:45 AM, Mvs Sarma wrote:
i imagine that Prabha jee
?Pleace a 01.1uF capacitor on ech channel, at the middle
pin of Violume control to ground. It would byepass the
RF induced in the speaker connecting cable.
? Aduio would disappear.
All the best
?sarma
?vu3zmv
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
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