[TMC] SBE use on 80 meters

[Tony Faiola]

Hello Andrea and Nick:

During my TMC tenure in the engineering department, I was fairly  
active on the ham bands in the late 1950s and early 1960s.  It was a  
pain to QSY on the ham bands with the SBE-2, so I developed a chart  
to indicate the correct frequency  positions on the VFO and SBE-2  
panel.  You can find this chart for all the bands (except 160 and new  
bands) on John Poulton's web site.  Sorry about the soldering iron  
burn.   Ciao, Tony Faiola, K3WX (ex W2GBS)
On Feb 4, 2012, at 7:30 PM, andrea wrote:

> 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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>
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Tony Faiola
faiola at ieee.org