[AMRadio] RE: r390a, sx17, t4xb for sale

[Gary Schafer]

The characteristic impedance of the cable is of little importance at 
audio frequencies. It is the capacitance that matters. If the circuit is 
a low impedance one then the capacitance does not matter much either. 
But in a high impedance circuit the capacitance becomes important.

73
Gary  K4FMX

Mike Dorworth K4XM wrote:
> 50 ohms is 50 ohms, plus 20 pf per foot cap all are killers! Mike,K4XM
> ----- Original Message ----- 
> Subject: Re: [AMRadio] RE: r390a, sx17, t4xb for sale
> 
> 
> 
>>>>>I have had a few reports of my audio not having a lot of highs,
>>>>
>>>even though I boost the mid and upper voice frequencies.
>>>There is nothing to limit the highs in any of the rigs, other
>>>than the mod iron, and even crappy mod iron will typically pass
>>>high enough frequencies to sound good, and found the cord between
>>>the mike preamp and the power amp was the problem.
>>>It was a 15 foot piece of rg8m, the little coax, with phono
>>>ends on it.
>>>You would think something that works for RF service up into VHF
>>>would be able to pass high audio frequencies, but no.
>>>I wonder why it was so poor for audio, cutting stuff above
>>>about 3000 cycles a lot????
>>>
>>>Brett
>>>N2DTS
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>>-----Original Message-----
>>>>From: amradio-admin at mailman.qth.net
>>>>[mailto:amradio-admin at mailman.qth.net]On Behalf Of Brett Gazdzinski
>>>>Sent: Monday, January 12, 2004 11:13 AM
>>>>To: amradio at mailman.qth.net
>>>>Subject: RE: [AMRadio] RE: r390a, sx17, t4xb for sale
>>>>
>>>>
>>>
>>>
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>>>
>>
>>
>>
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> 
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