Re: Audio in speakers during Tx
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Perhaps we need to have a sep[erate power wired from the building input thro a metal conduit and provicde an additional emi filter for that right at the load point.. Obviously the equipment ground would be connected to that .
?? Perhaps these are general precautions even the manufacturer prescribes. sarma vu3zmv
On Thu, Feb 8, 2018 at 10:23 PM, Dave Bottom <ars.kd6az@...> wrote: Even my Novice 75W transmitter would light the hall light at night each time I keyed the rig. Reversing the switches at each end of the hall made it non resonate on 40M. ?
Probably saved some RF to be radiated too.? LOL
Dave WI6R On Feb 7, 2018, at 9:15 AM, Michael Hagen < motdog@...> wrote:
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
?
On 2/7/2018 8:44 AM, Mvs Sarma wrote:
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
??
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
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