You might want to post the frequencies. Chuck WB2EDV
----- Original Message ----- From: "tritium242" <[email protected]> To: <[email protected]> Sent: Saturday, May 22, 2010 3:30 PM Subject: [Repeater-Builder] Crossband Repeater - Desense? High Pass Filter Needed? > Hello all. We have a cross band repeater (Midland 100W VHF low w/ 1W VHF > high band repeater built in). > > What we noticed is that in the High Band --> Low Band direction, the high > band side will receive the signal, then the low band Tx will key up to > repeat the signal. Normally, all works just fine. But at extended > distances, the low band TX keying up will deafen the high band side trying > to copy the faint signal (from an HT), resulting in a choppy, > unintelligible signal at the max distance. > > This is only with a faint/distant enough signal, like a HT at a distance. > In the other direction (low band --> high band), there is a HUGE increase > in maximum distance, even with just 1W from the high band Tx going out, > since it seems to be not enough power to desense the low band Rx. > > Long story short, will adding a high pass filter to the high band side to > shield the high band Rx from the powerful low band Tx do the trick? Where > can one find such a thing? It just has to pass from say, 100-120 Mhz, and > block everything below it, and tolerate 1W of Tx power is all. > > We'd like to avoid using a big, bulky cavity filter if possible, since we > don't need monster isolation figures, or high power handling capabilities. > Thanks in advance for any ideas! > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > -------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.819 / Virus Database: 271.1.1/2890 - Release Date: 05/22/10 14:26:00
