Re: [Repeater-Builder] Duplexer Wanted

Sun, 23 Apr 2006 12:23:09 -0700

Yes, standard 600 KHz split. The antennas are about 25 feet about horizontally and about the same level vertically. And it works very well. The PL on the receiver just helps to prevent the transmitter from getting into the receiver. But I have run it for days without any PL and without any problem. So the sensitivity is just as good as the receiver can be.

Mick - W7CAT

[EMAIL PROTECTED] wrote: 
At 4/22/2006 09:54, you wrote:
  
Hello Randy,

With only 25 watts, the other option is to use two antennas with some 
separation. And it is also helpful to add a filter to the transmit line 
and another to the receiver. At least add one to the transmit side. Adding 
a filter to the transmit side would help eliminate the high power 
interference, and no loss for the receiver.
    

You'd need a lot of antenna separation even with a pass cavity on the TX, & 
it would need to be vertical.  Kind of makes the installation not so portable.

  
 And of course PL on your receiver would help too.
    

...only if you have external co-channel issues or low-level IMD/spurious 
signals to deal with.  If you have desense or RF feedback & are trying to 
use PL to cover it up, your portable repeater will be practically useless 
for low-power HTs.

  
 I've been running a 35 watt repeater with two antennas and a transmit 
filter for more than a year and it works just fine.
    

How far apart are the antennas?  600 kHz split?

Bob NO6B






 
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