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

Mon Aug 12 12:08:26 EDT 2019

 You would have to "bypass" those 800 hz transformers and inject the DC where ever it belongs However this requires modification which might be more bulky and difficult than just supplying the 800hz AC. I like the class D with an 800 hz oscillator idea.
What say you, Dave?

    On Monday, August 12, 2019, 11:51:42 AM EDT, D C _Mac_ Macdonald <k2gkk at hotmail.com> wrote:  

 #yiv5553429542 P {margin-top:0;margin-bottom:0;}However, as I suggested, why could not the radio be operated from external supplies that provide the necessary voltages and currents? 
73 de Mac, K2GKK/5Since 30 Nov 1953Oklahoma City, OKUSAF, Retired ('61-'81)FAA, Retired ('94-'10)

From: Meir WF2U <wf2u at ws19ops.com>
Sent: Monday, August 12, 2019 10:15
To: D C _Mac_ Macdonald <k2gkk at hotmail.com>
Cc: ARC-5 list <arc5 at mailman.qth.net>; Milsurplus <milsurplus at mailman.qth.net>; Robert Downs <wa5cab at cs.com>
Subject: Re: [ARC5] [Milsurplus] I Must Have Lost My Mind... 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 BlueMailOn Aug 12, 2019, 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 

{Bart(dot)Lee(dot)K6VK(at)gmail(dot)com}

On Sun, Aug 11, 2019 at 2:05 PM Roy Morgan <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> 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

<hcfebcikfbochamk.jpg>

| 

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