[Boatanchors] Surplus Conversion Manual" Volume II

[Sandy]

I'd imagine the reason (for 800hz. power) might be the same as the older 
shipboard transmitters for medium wave.  They were supplied with 800 Hz. AC 
high voltage to eliminate the need for an external modulator for the 
transmitter when it was operated on the 600 meter band. Common practice back 
then.

Mackay Radio New Orleans threw away a big pile of 110 vdc and 220 vdc input 
and high voltage output at 800 Hz. for some of the old transmitters they 
used to have years ago.  The guy that ran the depot was an ex pre WW2 radio 
operator and fiured someone out there would someday need some of those!

73,

Sandy W5TVW

----- Original Message ----- 
From: <WA5CAB at cs.com>
To: <jfor at quik.com>; <w3nu at roadrunner.com>
Cc: <boatanchors at mailman.qth.net>
Sent: Friday, November 27, 2009 7:10 PM
Subject: Re: [Boatanchors] Surplus Conversion Manual" Volume II


> Same reason as for aircraft, to save weight.  The TBW was "portable".
> However, 800 cps apparently proved to be more trouble than the slight 
> additional
> weight reduction offset.  I can't think of anything much after the TBW and
> GO-9 that required it.  Although there was a lot of equipment built that 
> was
> rated to also run on it.
>
> In a message dated 11/27/2009 6:17:23 PM Central Standard Time,
> jfor at quik.com writes:
>> It was certainly used in aircraft, but I'm puzzled why it'd be used on
>> the
>> ground, unless the sets were for both air and ground.
>>
>> -John
>>
>> ================
>>
>>
>>
>> >800 HZ? I know of 400 Hz. for aircraft radios, but never heard of 800.
>> >
>> >wf2u at ws19ops.com wrote:
>> >>I know
>> >>the hurdle is the 115 VAC @ 800 Hz power requirement - provided you
>> >>have the original power supply with it. There are a few solutions.
>> >>Either you find (eBay is a source) of a powerline frequency converter,
>> >>or a suitable generator (usually surplus) you can spin with a 115 VAC
>> >>@ 60 Hz standard electric motor. In the absence of 800 Hz prime power,
>> >>an external power supply can be cobbled together to duplicate the
>> >>power outputs of the original power supply, and feed it into the unit
>>
>
> Robert & Susan Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
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