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Author Topic: Repeater and APRS  (Read 8879 times)
KA5IPF
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« on: May 15, 2013, 11:11:13 AM »

Our club repeater has been configured for separate rx and tx sites. This leaves the duplexers unused. They now want to add a 25w APRS radio at the TX site. My first thought was to re-tune the duplexers to the tx freq (146.9) and the APRS (144.39) and put the repeater tx on one port and the APRS on the other both feeding the antenna. I know the APRS rx is not a problem. How about when both transmitters are up?Huh There shouldn't be a problem but I thought I had better ask.

Anybody done this?

Clif
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K4JJL
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« Reply #1 on: May 15, 2013, 11:22:46 AM »

Just make sure that your antenna can handle the combined TX power output. Other than that you should be good to go.
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KA5IPF
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« Reply #2 on: May 15, 2013, 12:09:42 PM »

No problem there, DB224. fed with 7/8" Heliax.

Thanks,
Clif
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W5LZ
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« Reply #3 on: June 30, 2013, 11:46:34 AM »

And then... you could just use that separate antenna for both APRS TX/RX.  That'd 'save' the use of the duplexer for something else.
 - Paul
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K4JJL
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« Reply #4 on: June 30, 2013, 02:58:27 PM »

And then... you could just use that separate antenna for both APRS TX/RX.  That'd 'save' the use of the duplexer for something else.
 - Paul


Separate antennas?   He didn't mention having 2 antennas. He's basically turning his duplexer into a transmitter combiner.
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W5LZ
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« Reply #5 on: July 08, 2013, 05:52:17 AM »

'Separate antennas', meaning APRS digi and repeater antennas.  I figure the APRS digi was used with it's own antenna so it's available.  Right?  Keeping both systems separate makes for a simpler way of making changes to either system.  One won't affect the other.  It's basically a 'what's available' kind of thingy.
 - Paul
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KA5IPF
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« Reply #6 on: July 08, 2013, 08:17:47 AM »

'Separate antennas', meaning APRS digi and repeater antennas.  I figure the APRS digi was used with it's own antenna so it's available.  Right?  Keeping both systems separate makes for a simpler way of making changes to either system.  One won't affect the other.  It's basically a 'what's available' kind of thingy.
 - Paul


Quote from my original post "Our club repeater has been configured for separate rx and tx sites" Yes, we have 2 vhf antennas, one at the rx and one at the tx site at which I used the duplexers to combine the repeater transmitter and APRS rx/tx radio. Each site also has a UHF linking antenna.

Clif
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