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www.broadcastify.com
Do you have an SDS100?
Wow and you still get nothing on Philly? Use the Wide Invert filter and squelch 0?
Yes I see that spot on Google Maps. It's about 11 miles from the Roxborough towers but due to their weak output and despite their height I believe your signal would be coming from Squrt 9 station at Germantown and Carpenter which is 12 miles away. From Ridge & Trooper if my theory is correct, Philly would now be like the bottom of the stairwell and within line of sight. It looks like thats a pretty open area with few trees to block the signal. That's important. You should also be on a slight downslope towards Philly with a big hill back to the NW which could enhance signal strength. If you're using a rooftop 800mhz antenna on your vehicle you should really see these principles play out. For everyone else reading this, we're not just bantering back and forth, this may be a good teaching moment to help us understand what makes our P25 systems so spotty based on raw signal strength. But remember, with most receivng devices (besides the Uniden SDS model and the Unication pagers) you also have to worry about simulcast distortion - where if there is more than one transmitter within range of the same site (set of frequencies) coming in to the scanner at slightly different time intervals, that will throw off your scanner and you will not receive the signal at all, or not well enough.
True. But in another direction and flatter terrain I have successfully monitored the same system on an SDS100 from as far as 24 miles out. So in the right conditions it is possible.
