[Milsurplus] AN/URT-18 transmitter??

[John Vendely]

Hi Jim,

Thanks for the reply.  Yes, the AN/GRR-13 has exactly the same style of 
construction as all the KWT-6 variants--the familiar light gauge metal 
covers with toggle snaps, with the entire set mounted in an open relay 
rack.  The individual chassis are designed to unlatch and swing out for 
servicing.  The frequency selector unit looks a bit different from the 
310F-6, as does the number and arrangement of subassemblies.  I always 
assumed it was merely a military nomenclatured version of a standard 
product, but I don't see anything in the Collins catalogs of the time 
which looks identical.   I really have never spent much time analyzing 
it, though I'm sure it must be just another variation on the KWT-6 
theme.  Manuals for the other variants might well serve as a guide.  
This discussion has certainly piqued my interest, and I could furnish 
some pix in case you're curious about it...

73,

John K9WT

On 11/13/2010 12:04 PM, Jim Whartenby wrote:
> Hi John
> I have not heard of this one either.
> Looking through the Collins Collector Association site, I found no mention of it
> in the 1959 Catalog index, PTO specifications or Mechanical Filter
> specifications.  Does it have the same type of dust cover with the toggle snaps
> and / or Collins style sub assemblies?  My only suggestion is to down load the
> KWT-6 Components catalog at:
>
> http://collinsradio.org/archives/manuals/KWT-6_Components.pdf
>
> and see if any of the modules used in the GRR-13 are mentioned.  Perhaps your
> set is another one of a kind Collins production unit that saw limited use or was
> succeeded by another set from a different manufacturer?
>
> In looking through the 1959 catalog, I did see mention of the 310U exciter which
> is a possible answer to Nick's question about what exciter was used with the
> URT-18.
> Just another piece in the puzzle,
> Jim
>
>
> ----- Original Message ----
> From: John Vendely<jvendely at cfl.rr.com>
> To: milsurplus at mailman.qth.net
> Sent: Sat, November 13, 2010 9:45:05 AM
> Subject: Re: [Milsurplus] AN/URT-18 transmitter??
>
> Is anyone familiar with the AN/GRR-13 receiver, another fixed-station
> ARC-58/KWT-6 family derivative, though somewhat different from the 310F-6
> discussed below.  Back in 1980, I acquired a bunch of GRR-13 stuff, probably
> enough for at least one receiver with spares left over.  I'd love to restore it,
> but have rarely even seen mention of it, let alone schematics for it.  It's been
> on the back burner all these years for lack of documentation.  Does anyone have
> a line on manuals for it?
>
> 73,
>
> John K9WT
>
> On 11/10/2010 4:40 PM, Jim Whartenby wrote:
>> Hi Nick
>> The 310F-6 is a manually tuned receiver / exciter which uses the same modules
>> as
>> the KWT-6.  The autotuned version is the 310F-1 which is essentially an ARC-58
>> repackaged with a motor-generator producing the 115vac 400~ needed for
>> autotune.  Both are listed in the document below along with several other
>> variants.  If you leave off the HVPS and PA of a KWT-6 you then have the
>> 310F-6.
>>
>> http://www.collinsradio.org/archives/manuals/KWT-6_Components.pdf
>>
>> Regards,
>> Jim
>>
>> ----- Original Message ----
>> From: Nick England<navy.radio at gmail.com>
>> To: navy.radio at gmail.com; Military Surplus Mail List
>> <milsurplus at mailman.qth.net>
>> Sent: Wed, November 10, 2010 12:32:15 PM
>> Subject: [Milsurplus] AN/URT-18 transmitter??
>>
>> The AN/URT-18 HF transmitter comprises an exciter plus 2.5 kw linear
> amplifier.
>> The amplifier is an AM-2374/URT (Collins 204F-1)
>> So what is the exciter nomenclature? - it has some common components
>> with AN/URC-32 is the only clue I have.
>> Was this transmitter used by the Navy?
>> cheers,
>> Nick K4NYW
>> www.navy-radio.com
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