You should be able to decrease the carrier level and this will not hurt
the rig at all. Tubes are much more forgiving than transistors.
Thank you!
Brett Winchester KD7JN
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-----Original Message-----
From: For blind ham radio operators
[mailto:[log in to unmask]] On Behalf Of Shaun Oliver
Sent: Thursday, May 15, 2008 5:31 PM
To: [log in to unmask]
Subject: Re: power mods for tube rigs.
well,, firstly, I'm waiting for vision australia to transcribe the
manual into daisy format, so don't know if the 201 has a processor on
board.
and I too, would have thought that running your tubes at a lower voltage
would have some kind of effect on them. I'm just not sure it's a good
one. because I suspect that the tuning procedure is as much matching the
radio's impedance to that of your feed line as it is to get the maximum
efficiency out of your tubes.
Shaun
web sites:
http://www.myspace.com/blindmanshaunoliver
http://blindman.homelinux.org/~blindman/
skype: brailledude
On 16/05/2008 1:48 AM, the old scribe known as Colin McDonald was able
to impart this pearl of wisdom:
> hmmm, you should be able to adjust your plate control to reduce power
> without drastically effecting the tubes longevity.
> Also, does the 201 not have a processer onboard? If so, you can use
> the mike gain to reduce power, and the processer to insure maximum
> output at that level without having the inherent problems that low mic
> gain will cause.
> If no processer, then some sort of combination between lowered mike
> gain and adjusting the plate or load controls should help to get your
> power down to the "legal" limit for your license class.
> Of course, the load and plate also effect the receiver so you'll have
> to figure some workable combination out there.
> Also I can't quite understand how running tubes at a fraction of their
> output capability could actually reduce their longevity.
> in the audio world, running tubes at lower voltages and reduced output
> actually makes them last longer.
> regards
> Colin
> ----- Original Message -----
> From: "Shaun Oliver" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Thursday, May 15, 2008 7:33 AM
> Subject: power mods for tube rigs.
>
>
>> Hi guys, I'm just that much closer to gaining my license. sent away
>> for my foundation license manual today. now. the issue is, I wanna
>> run my radio at 10w and simply backing the mic gain off won't cut it.
>> is there a mod I could have a qualified tech do to reduce the output
>> on my old yaesu ft-201? if so, what's involved?
>> thanks in advance guys.
>>
>> --
>> Shaun
>> web sites:
>> http://www.myspace.com/blindmanshaunoliver
>> http://blindman.homelinux.org/~blindman/
>> skype: brailledude
>>
>>
>>
>> --
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>>
>
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