A good start might be a "diplexer" at the antenna to terminate the energy you do not want presented at the receiver. Put a termination on the uhf port and stick it in the vhf side of the feedline, assuming you are running two coax cables down to the shack. If the VHF is desensing the UHF, do the same thing in the UHF feedline with a termination in the VHF port. You don't say how much power you were running, but there comes a time when too much is too much.

Using two runs of 100 feet of 9913 on my TS2000, I only need the diplexer on the UHF coax. Funny how the third harmonic on VHF gets to be awfully close to the UHF frequency of interest. My watt meter can't tell the difference in UHF or 3 times VHF when I try to read the power. HI.

73, Jim WA4IVM

On Mon, Jun 30, 2008 at 1:18 PM, Simon Brown (HB9DRV) wrote:

Same here with TS-2000, 6ft *aluminium* boom and SSB Electronics masthead

pre-amps.

I'm thinking about a 6ft to 9ft fibreglass boom anyway, I would be interested also in user comments.

Simon Brown, HB9DRV

-------------------------------------------------- From: "Reicher, James" <[email protected] mailto:[email protected]   mailto:[email protected] >

I got significant de-sensing of my 2 meter downlink from my 70cm uplink at Field Day.  I know a good part of it was due to the short cross-boom (about 4 feet) I was using.  I would like to decrease the de-sense on this set-up before I permanently install it at my home station.  Any and all suggestions are welcome.

_______________________________________________ Sent via [email protected]. mailto:[email protected]   mailto:[email protected]  Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb http://amsat.org/mailman/listinfo/amsat-bb   http://amsat.org/mailman/listinfo/amsat-bb