[ARC5] SCR-183 Manuals GF/RU

[WA5CAB--- via ARC5]

Mike,

I didn't mean that the GF and RU were all 14-volt, but that the 
transmitters and receivers that are a part of those sets are all 14 volt regardless of 
what the nameplate says.  Which is not true of the transmitters and 
receivers used in SCR-A*-183 and SCR-A*-283.  In the GF and RU, the only difference 
between the transmitters and the receivers marked for 14 or 28 VDC is the 
nameplate.  The only three components of the GF/RU that are functionally 
differerent between the 14 and 28 volt sets are the dynamotor, antenna relay (GF 
only), and junction box.  Everything else is just nameplate.  So you could 
(and the Navy at times no doubt did) mix and match RU-11/12 and RU-18/19 
marked receivers regardless of what aircraft they were in.  But you could only 
mix RU-11/18 or RU-12/19 dynamotors and junction boxes.  All (AFAIK) 28 volt 
junction boxes have two externally mounted filament dropping resistors.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 11/11/2014 09:04:54 AM Central Standard Time, 
radiocompass at yahoo.com writes: 
> Robert,
> 
> 
> The GF/RU sets aren't all 14 volt.  The ones with blue name plates are 28 
> volt; the ones with black are 14 volt.  I said "RU-19" when describing my 
> receiver, but it is a 14 volt radio with black tags; so that may make it an 
> RU-18?  It was down in the basement when I wrote the message, so I didn't 
> make the trek to dig it out.
> 
> 
> 73
> 
> 
> Mike
> WA4DLF
> 
> From: WA5CAB--- via ARC5 <arc5 at mailman.qth.net>
> To: arc5 at mailman.qth.net 
> Sent: Tuesday, November 11, 2014 12:24 AM
> Subject: Re: [ARC5] SCR-183 Manuals
> 
> 
> One thing that anyone trying to mix GF/RU and SCR-183/283 components 
> should 
> be aware of is that (like the radio used with and erroneously called 
> SCR-522), all GF transmitters and RU receivers regardless of model number 
> are 14 
> volt sets. Whereas the BC-429 and BC-430 are 28 volt sets (the tube 
> heaters 
> are wired series-parallel). So although you can operate an RU receiver 
> with a 
> BC-230, you cannot operate it with a BC-430 unless you provide two 
> separate 
> DC filament supplies.
> 
> Robert Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480 
> 
> 
> 
> 
>