[Milsurplus] GRT-21/23

[D C *Mac* Macdonald]

Hi, Glenn.
 
I'm not familiar with that part number, but will try to
remember to research it Monday when I go back to work.
 
I overhaul probably 20 or more of the 8006081G1 VHF
Driver/Power Amplifiers for the AN/GRT-21 modules
(VHF 118-136 MHz) every month.
 
>From your description, you probably have the UHF
(225-400 MHz) modules for the AN/GRT-22 (NOT GRT-23).
I don't work those, but another tech in our shop does
overhaul those.
 
The VHF amp has two flat circuit boards and the first
of the two uses one PT-6702 as its output stage to
drive a PT-6708 with a PT-6709 the final stage.
 
BTW, the companion receivers (VHF and UHF) are the
AN/GRR-23 and AN/GRR-24.
 
73 - Mac, K2GKK/5
(Since 30 Nov 53)
OKlahoma City, OK



> Date: Sat, 1 May 2010 10:12:19 -0400
> To: Milsurplus at mailman.qth.net
> From: glennmaillist at bellsouth.net
> Subject: [Milsurplus] GRT-21/23
> 
> I have a module that I got at a hamfest.
> It is ITT assy 8004890G1.
> It is a Driver/Power Amplifier, RF.
> Can anyone verify that this is part of the GRT-21 or GRT-23 transmitter?
> These only put out 10 Watts.
> This amplifier looks like it is capable of much more with the proper heatsink.
> The output modules (3) are assy number 8004892G1 and each have two RF 
> power transistors.
> The transistors are TRW PT6702.
> The transistors have a date code of 7451.
> The PA modules look like this 
> http://www.bpbsurplus.com/lc/cart.php?target=product&product_id=16983&category_id=256
> 
> Google just finds voltage regulators and people that want you to get 
> a quote for the transistors.
> 
> Any help as to what this came from and the device ratings greatly appreciated.
> 
> 73
> Glenn
> WB4UIV