<div dir="ltr">Bleeds over as in desensitizes the receivers or you can actually hear audio?<div><br></div><div>Most modern receiver front-ends have minimal filtering, just a wide pass-band filter and the IF filters which reject the adjacent channels more then channels further off frequency. If you have more than -30 dBm showing up on any antenna regardless of frequency spacing it'll probably cause problems. 150 ft is only ~45 dB of isolation, so if you're transmitting with +45 dBm (32W) less 2 dB of duplexer loss, less 2.5 for cable loss plus 3 dB for repeater antenna, less 45 dB of isolation plus 3 dB for rx antenna gives about +1.5 dBm which is definitely going to mess up a receiver unless more filtering is used. You can play with filters to see what works, but I suspect you'll need two notch filters to get that down to something that doesn't effect your receiver.</div><div><br></div><div>You need to hook the system to a service analyzer and see if it's actually over modulating, it's doubtful unless you've injected audio after any limiter circuits. Running the math it's probably front-end overload, you'd be best to notch out the transmitter on the effected receivers, you may have to put a pass filter (and/or notch filter) on the transmitter too to remove some sideband noise as well, maybe not if it's a clean transmitter. It's usually a good idea to have balanced reject filtering on both your transmitter and receiver.</div><div><br></div><div>Jesse</div><div><br></div><div> </div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Oct 12, 2017 at 1:13 PM, Bob Pyke <span dir="ltr"><<a href="mailto:k6ecm1@gmail.com" target="_blank">k6ecm1@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Our RPi controlled radio has an rf spectrum so wide that it bleeds over in my Yeasu (150 feet between antennas) when I'm working a distant repeater that is more that 200 kHz away from our tx freq. Any suggestions where I can look for info on how to deal with this? Our duplexer is the notch type.<br>
<br>
Thanks,<br>
Bob<br>
k6ecm<br>
73<br>
Sent from my iPhone<br>
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