[TMC] SBE use on 80 meters

[andrea]

Hi Nick

The SBE-9 is used also with the GPT750G-2.
and the NAVSHIPS 0967-214-5010 is the manual for the GPT750F-2 GPT750G-2
and GPT750H-2.

In this manual at page 4 is written: 

"RADIO TRANSMITTER
MODELS GPT-750 F-2, GPT-750 G-2 AND GPT-750 H-2
With the exception of the sidebandexciters, Radio Transmittes
GPT-750 F-2, GPT-750 G-2 AND GPT-750 H-2 are similiar to Radio
Transmitters
GPT-750  D-2 and GPT-750 E-2.
The existing technical manual (IN-315) for GPT750 D-2 and GPT-750 E-2 
will apply as written with the following exceptions:

1. GPT-750 F-2 uses Sideband Exciter SBE-8.

2. GPT-750 G-2 uses Sideband Exciter SBE-9.

3. GPT-750 H-2 uses Sideband Exciter SBE-10. "

So you can use the VFO with the SBE-9 in the same way as used with the
SBE-2.
in 80 meters I use the VFO from 3230 to 3530  for and output frequency
of 3500 - 3800 Khz.

73 from IK5NXD Andrea

p.s. you can download the manual at
http://bama.edebris.com/manuals/military/gpt750/






Il giorno ven, 03/02/2012 alle 12.11 -0500, Nick England ha scritto:
> Hi gang - if you have a TMC VOX (VMO Variable Master Oscillator), how
> do you use your SBE to cover 80 meters?
> 
> The VMO covers 2000-4000 kc and gets mixed with the 270kc sideband
> signal in the SBE (SBE-2, -3). Normally the VMO is set 270kc higher
> than the desired output frequency and the lower mixer product (VMO
> -270) is tuned for amplification. For desired outputs of 3730-4000 kc,
> the VMO is set 270kc lower and the upper mixer product is tuned
> (VMO+270) - and the sidebands are reversed of course.
> 
> I have an SBE-9 which has a 250kc local osc - the manual blithely says
> tune the VMO from 2000-4250 kc for output frequencies 1750-4000 kc,
> with no mention of the flip-flop as in the earlier SBE manual. But my
> VMO don't tune up to 4250 (unless I double from 2125). This would be a
> major PITA when moving from below to above 3750kc (not just retuning,
> but turning the VMO dial about 15,000 turns).
> 
> So, with that background, does anyone see any reason I can't just
> cover the whole 80 meter band by tuning the VMO from 3250-3750 and
> always tuning to the high side of the mixer product? Yeah the
> sidebands are flipped and the MF tuning dial will be off, but so what.
> 
> And yeah, I know I could just hook up my HP signal generator and
> forget about the VOX, but what's the fun in that? The whole point of
> TMC-ness is Heavy Metal and lots of it!
> http://www.navy-radio.com/misc/shack.htm
> 
> cheers,
> Nick K4NYW
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