[AMRadio] Re: B&W 5100B Audio Mods


Larry Szendrei ne1s at neandertech.com
Sun Jan 2 22:14:56 EST 2005


I think it would have to be, Tom. Then there should be an audio choke 
between the screen supply and the screens.

-Larry/NE1S

Tom Elmore wrote:
> The unit I have has a separate B+ supply for the screens. So would this be
> self-modulating then?
> 
> -Tom
> ----- Original Message ----- 
> From: "ne1s" <ne1s at neandertech.com>
> To: "Discussion of AM Radio" <amradio at mailman.qth.net>
> Sent: Wednesday, October 20, 2004 8:56 AM
> Subject: [AMRadio] Re: B&W 5100B Audio Mods
> 
> 
> 
>>i am not familiar with the 5100B, but I would be VERY surprised if the
>>screens weren't modulated as well as the plates - it is absolutely
> 
> necessary
> 
>>to achieve 100% modulation of tetrode, pentode, or beam-power calss C RF
>>stages. This is usually done with this class of transmitters (~100W
>>commercially-manufactured ham AM rigs)with a screen droping resistor from
>>the modulated plate supply. It can also be done with a dropping resistor
>>from the unmodulated B+, or an audio choke from a voltage source equal to
>>the desired screen voltage; in these cases, the screens self-modulate.
>>
>>GL,
>> -Larry/NE1S
>>
>>Tom Elmore writes:
>>
>>
>>>    Does, anyone know of a source for audio mods for the B&W 5100B
>>>transmitter. I wonder if anyone has tried to modulate the screens in
>>>addition to the plate of the finals. It appears the screens use a
> 
> different
> 
>>>power supply than the plates of the finals.
>>>
>>>Thank You
>>>Tom Elmore KA1NVZ
>>>Anchorage  Alaska
>>>
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>>
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> 
> 
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