[MRCA] Retransmit Project Phase 2

[Ray Fantini]

The AM-7239 two radio adapter along with the AM-7238 amplifier lets you run two RT-1439 radios at the same time, one with the high power amplifier and one direct to its own antenna. In that configuration the two separate antennas are only separated by maybe six or eight feet. The low pass filter for the PRC-138  will remove anything that would be in the VHF radios pass band and the antenna tuner for the HF radio will do a good job of removing any VHF component for that radio. Don't think there will be any issue as long as you don't do anything stupid.
RF

-----Original Message-----
From: mrca-bounces at mailman.qth.net [mailto:mrca-bounces at mailman.qth.net] On Behalf Of W2HX
Sent: Tuesday, September 11, 2012 6:45 PM
To: B Smith; mrca at mailman.qth.net
Subject: Re: [MRCA] Retransmit Project Phase 2

Yes! Very important warning. I plan to use this 200W, 25 MHz low pass filter that came with the PRC-138.  That should help no?

http://www.w2hx.com/x/PRC-138/IMG_9276.JPG

Anyone know what front end protection exists with the RT-1439 using the AM-7238/39 power amp? 


 
73 Eugene W2HX
 

-----Original Message-----
From: B Smith [mailto:smithab11 at comcast.net]
Sent: Tuesday, September 11, 2012 6:29 PM
To: W2HX; mrca at mailman.qth.net
Subject: Re: [MRCA] Retransmit Project Phase 2

Beware of running high power and having two separate antenna systems, an easy way to blow a front end unless the receiver is  protected.  Some systems have built in protection - - - I have an HF  set on the bench that has front end protection up to 50 volts but I prefer not to test it. 
:-)

Z

--------------------------------------------------
From: "W2HX" <w2hx at w2hx.com>
Sent: Tuesday, September 11, 2012 5:47 PM
To: <mrca at mailman.qth.net>
Subject: [MRCA] Retransmit Project Phase 2

> Hi all,
>
> The other day I posted my limited success in getting a 20W HF radio
> (PRC-138) interfaced for retransmit with the low power (4W?) PRC-119.  
> As I move through the phases of getting a whole system up and running, 
> the next step was to get the PRC-119 set up in the vehicle mount using 
> the RF amp for high power output. Although I've owned the VRC mounts 
> and amp for a while, I've never had the chance to test it out. Well 
> today I did, and voila! Everything worked like a charm.
>
> If you are interested, please see the video I made detailing the 
> testing for power out using the RT-1439, AM-7238/39, an AS-3900 
> antenna standing on a tripod.
> Next steps is to get the PRC-138 connected to the 125W power amp, 
> RF-382A antenna coupler and interface the two.
>
> This is where things will get interesting, running two high power 
> radios with antennas in the same backyard! It will be interesting to 
> see what interference arises and what the practical realities are of 
> such a set up in a small backyard.
>
> Enjoy.
>
> http://www.w2hx.com/x/PRC-119/VRC-90-Power-Test/
>
> (hint, watch the videos in numeric order)
>
>
> 73 Eugene W2HX
>
>
>
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