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" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" <[email protected]>
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
______________________________________________________________
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:[email protected]
______________________________________________________________
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:[email protected]
______________________________________________________________
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:[email protected]
