[ARC5] Wow...

[MARK DORNEY]

How available were these transmitter parts from the Australian contractor?  And are these parts still obtainable today? 

Mark D. 
WW2RDO

“In matters of style, float with the current. In matters of Principle, stand like a rock. “.   -   Thomas Jefferson 

Sent from my iPhone

> On Jul 31, 2021, at 10:35 PM, MARK DORNEY via ARC5 <arc5 at mailman.qth.net> wrote:
> 
> 
> 
> “In matters of style, float with the current. In matters of Principle, stand like a rock. “.   -   Thomas Jefferson 
> 
> Sent from my iPhone
> 
>>> On Jul 31, 2021, at 10:26 PM, Brian Clarke <brianclarke01 at optusnet.com.au> wrote:
>>> 
>> 
>> Not quite correct, folks.
>>  
>> And not quite a Jeep. During WWII, the RAAF contracted Amalgamated Wireless of Australia, as its government-contracted maintainer, to convert SCR-274-N equipment to 12 V operation for installation in the Avro Anson aircraft. There were 12 V dynamotors for the receiver and modulator that were the same form factors and connections as the 28 V versions – I’ve had them in my hands. Heaters were wired in parallel. The antenna relay coils in the transmitter and antenna changeover relay box were paralleled. The only new component required was the transmitter cathode relay. No change was made to the control boxes.
>>  
>> Cheers, Brian, VK2GCE
>>  
>> From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On Behalf Of Ken
>> Sent: Sunday, 1 August 2021 12:05 PM
>> To: MARK DORNEY; kk5f at arrl.net
>> Cc: ARC-5
>> Subject: Re: [ARC5] Wow...
>>  
>> No.
>>  
>> The BIG problem is the control boxes.
>>  
>> I thought Mike made that abundantly clear.
>>  
>> From his extensive and accurate knowledge, it is completely clear that the entire SCR-274/N system could not possibly have been converted to operate from 12 VDC by any front-line tech. The necessary parts would have been completely unavailable.
>>  
>> Therefore, the only possible way this equipment could have been operated in a Jeep is via some source of 24 V power.
>>  
>> Ken W7EKB
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