Is there a cheap way to combine two txcvrs into one antenna... 144.39 APRS
and 145.550 packet?
...@yahoogroups.com] On Behalf Of na4it
Sent: Thursday, July 15, 2010 1:04 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Transmitter Combiner
Is there a cheap way to combine two txcvrs into one antenna... 144.39
APRS and 145.550 packet?
About the only way is via a duplexer. (Cheap? Well... used??? ;- )
Joe M.
na4it wrote:
Is there a cheap way to combine two txcvrs into one antenna... 144.39 APRS
and 145.550 packet?
Maybe a pair of those 6 cavity mobile duplexers with the 5 MHz split
can be configured as 6 notch sections each to reject the opposite
frequency. and then combine them with a T to the antenna.
Lossy, but should be cheap, I've seen those go in the $20 range.
On Thu, Jul 15, 2010 at 1:49 PM, MCH
At 7/15/2010 13:53, you wrote:
Maybe a pair of those 6 cavity mobile duplexers with the 5 MHz split
can be configured as 6 notch sections each to reject the opposite
frequency. and then combine them with a T to the antenna.
Even though they're notch duplexers, each side has a very weak pass
I could live with 3dB of loss which is about what I would expect per
leg. I've ran the UHF notch duplexers back wards and they have ran
ok, but the insertion loss does go up like 1-2dB.
If you want to get picky you would have to modify each set so that the
coupling loops and coaxes are the same,
DCFluX dcf...@gmail.com wrote:
Maybe a pair of those 6 cavity mobile duplexers with the 5 MHz split
can be configured as 6 notch sections each to reject the opposite
frequency. and then combine them with a T to the antenna.
Lossy, but should be cheap, I've seen those go in the $20 range.
On
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