[ARC5] [Milsurplus] I Must Have Lost My Mind...

Mon Aug 12 11:15:21 EDT 2019

The whole power supply (HV, etc) works off 800 Hz, because of the 800 Hz transformers.
The design rationale was weight and size saving on the transformers as opposed to 60 or even 400 Hz line. The motor-generator is lighter also, as the generator needs less iron. The primary current to run the motor-generator was DC.
Later development standardized the AC current on aircraft at 400 Hz.

73, Meir WF2U
Landrum, SC

⁣Sent from BlueMail 

On Aug 12, 2019, 10:53 AM, at 10:53 AM, D C _Mac_ Macdonald <k2gkk at hotmail.com> wrote:
>While I am not at all familiar with this equipment, how much ACTUAL 800
>Hz AC is required?  Can the high voltages be supplied with power
>supplies running on "normal" 60 Hz AC and the actual portions that
>require the 800 Hz supply run from a much less robust source?
>
>The same question and suggestion above could easily be applied to other
>military gear that requires a high frequency supply for small portions
>of its overall load.
>
>73 de Mac, K2GKK/5
>Since 30 Nov 1953
>Oklahoma City, OK
>USAF, Retired ('61-'81)
>FAA, Retired ('94-'10)
>________________________________
>From: arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> on
>behalf of Robert Downs via ARC5 <arc5 at mailman.qth.net>
>Sent: Monday, August 12, 2019 00:24
>To: 'ARC-5' <arc5 at mailman.qth.net>; 'milsurplus at mailman'
><milsurplus at mailman.qth.net>
>Subject: Re: [ARC5] [Milsurplus] I Must Have Lost My Mind...
>
>
>Unfortunately, 400 watts is inadequate.  600 watts is about the minimum
>if you don’t want to have to nursemaid the inverter.  I have some
>PE-206-C’s that are rated 500 watts continuous output and am told that
>they won’t quite run a GP-6, -6a or -7 to full output on high power.
>
>
>
>Robert Downs
>
>
>
>From: arc5-bounces at mailman.qth.net
>[mailto:arc5-bounces at mailman.qth.net] On Behalf Of spr at earthlink.net
>Sent: Sunday, August 11, 2019 20:27
>To: Bart Lee; Roy Morgan
>Cc: ARC-5; milsurplus at mailman
>Subject: Re: [ARC5] [Milsurplus] I Must Have Lost My Mind...
>
>
>
>
>
>400W class D (switching) audio power amps are not hard to find. Audio
>oscillators likewise.
>
>
>
>/scott
>
>
>
>-----Original Message-----
>From: Bart Lee
>Sent: Aug 11, 2019 3:54 PM
>To: Roy Morgan
>Cc: ARC-5 , "milsurplus at mailman"
>Subject: Re: [ARC5] [Milsurplus] I Must Have Lost My Mind...
>
>"Unobtainium 800 cycle inverter possible."
>
>
>
>Has anybody created use-able 800 cycle power other than by
>motor-generator?
>
>Maybe aviation maintenance equipments?
>
>A high power audio amp with a 555 oscillator?
>
>Frequency Doubler-Double-Doubler high power diode circuits?
>
>
>
>A couple of AN/APA-38 Panoramic Adaptors (30 MHz) would like to know...
>
>
>
>73 de Bart, K6VK ##
>
>-- --
>
>Bart Lee, K6VK, CHRS, AWA, ARRL
>
>
>
>Texts only to: 415 902 7168
>
>www.bartlee.com<https://eur04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.bartlee.com%2F&data=02%7C01%7C%7Cbe3350f59eb24875cf1608d71ee55efa%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637011842804059277&sdata=dcYHttWX0YH4kDm0VAO45F5SNj%2BwbDG24T6pJK8hcn8%3D&reserved=0>
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>
>{Bart(dot)Lee(dot)K6VK(at)gmail(dot)com}
>
>
>
>
>
>
>
>On Sun, Aug 11, 2019 at 2:05 PM Roy Morgan
><k1lky68 at gmail.com<mailto:k1lky68 at gmail.com>> wrote:
>
>If there is someone out there who REALLY wants one, talk to me.
>
>
>
>Aircraft sourced separately.
>
>Unobtainium 800 cycle inverter possible.
>
>Roy sends.
>
>On Aug 11, 2019, at 12:16 PM, David Stinson
><arc5 at ix.netcom.com<mailto:arc5 at ix.netcom.com>> wrote:
>
>It's a Westinghouse GO-9 U.S. Navy Liaison transmitter, circa 1940.
>100 Watts out, CW Only, runs on 800 cycle AC like the later GP-7.  |
>On the left is the Power Supply, 2000V and 500V.
>On the right is the High Frequency transmitter module, 3-18 MC.
>Missing to the left of the power supply is the Longwave transmitter
>module.   Often installed in pre- and early-war PBY patrol aircraft.
>Most PBY Radio photos you find at Google are from later, with
>the AN/ARC-8 installed.
>
>Good overview on Mike Hanz's excellent site:
>http://aafradio.org/flightdeck/go9.htm<https://eur04.safelinks.protection.outlook.com/?url=http%3A%2F%2Faafradio.org%2Fflightdeck%2Fgo9.htm&data=02%7C01%7C%7Cbe3350f59eb24875cf1608d71ee55efa%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637011842804059277&sdata=aHuIi0%2FnOZV67Xfl5rnUMsqNwTQ3DEcrlyoKa1BwKJY%3D&reserved=0>
>
><hcfebcikfbochamk.jpg>
>
>
>
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