[TMC] SBE use on 80 meters

[Nick England]

Many thanks, Tony - it is great to have confirmation from someone with
your firsthand knowledge and experience. I expected that I understood
how it should work, but just figured I would ask the group since there
was that difference in operation between the SBE-2 and SBE-9 manuals.
73 & Have Fun,
Nick K4NYW
www.navy-radio.com

On Sat, Feb 4, 2012 at 9:40 PM, Tony Faiola <arfaiola at erols.com> wrote:
> 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
>
>
>
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