[MRCA] AN/PRC-108 Antenna

[Al Klase]

Hi Ray,

I'd be leaning in the direction of the 10-ft whip and spring base used 
with a lot of pack sets, including PRC-25/77 and PRC-104.  Yes, you'd 
have to gin up a base, but the 3/8-24 threads are pretty common in 
civilian antenna parts.  You could "loose" a couple of sections of the 
fishpole if the length is too cumbersome.

Then keep an eye out for a PRC-74 whip.  It's the same thing with a 
jumpered center-loading coil.


The mount is the rare part, but probably wouldn't be usable on a 
different size radio.

Al

On 6/26/2018 8:56 AM, Ray Fantini wrote:
>
> So the question is this, I am in the process of building up some sort 
> of small whip antenna for my PRC-108 transceiver. It has rocks for 
> both 3.885 and 5.357 installed being it operates on both USB and AM. 
> Happy with the way it works when used with its 50 Ohm output driving a 
> dipole or inverted V but the idea now is to have a vertical whip for 
> backpack portable operation over short distances, things like Dayton 
> or other field events.
>
> The radio has an internal loading coil and second output that can 
> drive a short antenna but the problem is that I will have to fabricate 
> the adapter plate, mount and antenna from scratch. I have two choices 
> for the antenna that I am currently looking at. The first choice is a 
> seven foot whip antenna but I do not have a base for that antenna yet, 
> and it appears that it would be a rigid non flexible base if I build 
> one. The second antenna is just a little over three feet long but has 
> a spring base and good attachment point. I would prefer to work with 
> the shorter whip being it’s mechanically better and also would avoid 
> some of the issues that the long antenna with the rigid base may get into.
>
> At the frequencies this radio operates at both antennas would be way 
> short and I think what the radio originally had was a ten foot whip 
> but the possibility of finding that is right up there with Hens teeth. 
> Assuming that any vertical would be a poor compromise would there be 
> any real difference between using the super short three foot vertical 
> as opposed to the seven foot vertical? Can anyone model what the 
> difference would be?
>
> Ray F/KA3EKH
>
>
>
> ______________________________________________________________
> MRCA mailing list
> Home: http://mailman.qth.net/mailman/listinfo/mrca
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:MRCA at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

-- 
Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/mrca/attachments/20180626/1c943502/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: PRC-74 antenna.png
Type: image/png
Size: 1121341 bytes
Desc: not available
URL: <http://mailman.qth.net/pipermail/mrca/attachments/20180626/1c943502/attachment-0001.png>