[Milsurplus] PRC-25 Antenna

[Alan Tasker]

At 10:14 AM 6/18/2007, you wrote:
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>Hi All,
>
>Just wondering about which adapter,  the AB591 or the spring has the 
>tip that changes the tuning so that the radio will load into the 3 
>ft whip.  I think that it is the AB591 and that I believe is used 
>with the 9 ft AT 271.

The PRC-25/77 radio is set up to load into the 3' whip with is 
"gooseneck" base. Without an antenna present, it will feed the 50 Ohm BNC.

The long whip has a "flexi" base with an extension below its base 
threads that projects deep enough into the PRC-25/77 to switch the 
antenna loading circuit to the long whip mode.

The PRC-117/RT-3090 will be damaged if you use the long whip base, as 
it is not set up for that. As I understand it, most RT-3090 have an 
antenna loading circuit for the standard PRC-25/77 short antenna with 
its gooseneck base, while the PRC-117 and certain RT-3090 use instead 
a longer whip. This longer whip is equivalent in length to a standard 
PRC-25/77 short blade antenna, including its gooseneck base, plus an 
additional gooseneck section. The length is also equivalent to the 
PRC-128 long low band antenna (a blade only which is as long as a 
standard PRC-25/77 short antenna with gooseneck base), plus a gooseneck base.

Hopefully, this is understandable. Please ask if you need additional info.

Alan

>
>Also, can these be used with the PRC-117 RT-3090 radios, and if so, 
>which will pass the self test.
>
>Inquiring minds want to know.
>
>Cheers,
>
>John  WD5ENU/A45XV
>
>
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