Yes, it depends on input Z of the amps.? I remember tube amps.?? I built a big stereo in the 60's, they had Hi Z so low values worked.? I have a great story....... My neighbors had a water heater system with a big water holding solar panel on the roof.? When I fired up the SB200 or 220, it cycled their water pump.? They figured it out!?? They heard me Yelling on the Mic during a DX Contest!? They put 2 and 2 together.

I had to go on the roof and put .1uF? on all their control switches and wiring!?? It was a perfect 20 Ant. up there.

73's

Mike

?

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

??

Regards
MVS Sarma
?

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

Regards
MVS Sarma
?

On Wed, Feb 7, 2018 at 7:00 PM, Praba Karan <vu3dxr@...> wrote:

external amplispeaker...

i heard audio even volume down bottom.

Virus-free.

On Wed, Feb 7, 2018 at 6:18 PM, Mvs Sarma <mvssarma@...> wrote:

Is it external speaker or external amplispeaker?

Regards
MVS Sarma
?

On Wed, Feb 7, 2018 at 5:05 PM, Praba Karan <vu3dxr@...> wrote:

This issue is from microbitx

--

D.Prabakaran?

VU3DXR

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...