[Milsurplus] Japanese TRP-4 Information Needed.

[Mike Morrow]

Breck wrote:

>This is my annual request for any information on this special
>ops radio.

While searching for info on the little-known AN/TRC-88 recently, I found reference to the TRP-4, the AN/TRC-77, the AN/TRC-88, and the AN/PRC-74 in the following IEEE publication:

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Title:  "Comments on the performance of selected low-power HF radio sets in the tropics"
By Hagn, G.H., Vincent, W.R.   

This paper appears in IEEE Transactions on Vehicular Technology
Publication Date: May 1974  Volume: 23,  Issue: 2  Page(s): 55-58

Abstract
The performance of five low-power HF radio sets was measured at 3.6 MHz under field conditions in Thailand. Variations in performance were noted for CW and voice transmissions as a function of type of set, type of antenna, time of day, and communication range (5-100 mi) in tropical forest (jungle), mountain, and delta terrain. Radio teletype (RTTY) tests over longer paths (out to 1320 km) were made using a jeep-mounted set. The results showed that relatively good communications can be achieved in the tropics on short and intermediate length paths with low-power sets--especially when the proper antenna is used and when the operating frequency is properly chosen.  
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Unfortunately, my IEEE membership doesn't let me download the pdf of this article without additional charges.

It looks like your TRP-4 is of the same vintage, and would fill the same role, as the rarely-seen RT-655/TRC-88.  This is the USB/CW version of the RT-654/TRC-77.  I have one, serial number 9, electrically complete but missing some mechanical items.  It's the only one I've ever seen in the flesh.

Mike / KK5F