[Boatanchors] Re: [FLBOATANCHORS] Re: 160 Meter AM Question -Transverter

[Gary Schafer]

> -----Original Message-----
> From: boatanchors-bounces at mailman.qth.net [mailto:boatanchors-
> bounces at mailman.qth.net] On Behalf Of kd4e
> Sent: Monday, January 29, 2007 1:26 PM
> To: FLBOATANCHORS at yahoogroups.com
> Cc: Boatanchors at mailman.qth.net; BOATANCHORS at LISTSERV.TEMPE.GOV
> Subject: [Boatanchors] Re: [FLBOATANCHORS] Re: 160 Meter AM Question -
> Transverter
> 
> > You don't want to run it Class C, as it will distort the SSB signal.
> > To run AM, it would be better to build an exciter with Class C finals
> > and Class B Audio. It would be an inefficient way to run AM using
> > such a transverter, because you would have to drop the drive from 40m
> > to drive the transverter, and then you would be looking at
> > inefficiency of the 6146 as a linear(AB1). Joe W4AAB
> 
> I thought that I had read of designs where a switching
> mechanism would allow the amp to run in Class C or AB1
> mode.  Is the reality that attempting that not recommended?

All you need to do is put a switch in to increase the bias and change the
screen voltage for class C. You then increase the drive to get into class C.
Your mixer/driver will have to have enough extra output to drive them into
grid current for class C. Look in some of the mid 60's handbooks for
universal amplifiers with a pair of 6146's. It will give all the info for a
dual mode amplifier.

73
Gary  K4FMX