Regarding the Filters, PAR is making me one filter that is somehow going to address both frequencies, but you're right, I don't know which one is causing me issues, or if it's both. Anyway, he is making me a dual-stage filter that will target both frequencies. We'll see what happens. If that doesn't create enough of a "notch" for each frequency to help with my issues, the filter can be re-tuned so both stages are focused at only one offending frequency.
Sudden Loss of Reception
- Thread starter emsflyer84
- Start date
ecps92
Member
You are under 2mi from the Hospital which would be a common transmitter site for a paging vendor.
ecps92
Member
time for me to bow out of these multiple threads for the same issue, as you can't fix something till you know where the actual offender (freq) is
Yes, I'm on a bit of a hill and there is a valley between me and the hospital, so we are basically LOS between us. I can't seem to find what paging system or frequencies they might be using at that particular hospital though...
No problem, thanks for your input. This thread was only meant as a curiosity for me regarding what the pager transmitters were actually used for.
ecps92
Member
(i know I should just hang it up) you need to listen to the Conway Channel and then on a second radio determine which of the two possible frequencies is the offender -yes these page out a lot, but there is down time, so nailing it down is cruicial)
Will try to do this and see what happens. Thanks.
Several of them near me have a 1 kW ERP.
Don't know where exactly @emsflyer84 is located in NH, but check out this license for 157.740...
ERP of 2800 watts.
FCC Callsign WPPG455 (Central Vermont Communications, Inc.)
FCC Callsign WPPG455 (Central Vermont Communications, Inc.)
www.radioreference.com
ERP of 2800 watts.
That’ll kick the tires and light the fires!Don't know where exactly @emsflyer84 is located in NH, but check out this license for 157.740...
FCC Callsign WPPG455 (Central Vermont Communications, Inc.)
FCC Callsign WPPG455 (Central Vermont Communications, Inc.)www.radioreference.com
ERP of 2800 watts.
- Joined
- Aug 17, 2010
- Messages
- 1,338
when we had our vhf paging system we had ERP close to or over 3000 watts at main towers and 1000 at hospital sites. either one at your range will easily overload you. heck i could watch our modulation on a couple of tv channels when the cable was still analog around here. it put wavy vertical lines in the picture that almost looked exactly like the horizontal mod line on the service monitor. bad thing was the worst channel was the one The Weather Channel was on and was our busiest carrier that during the day rarely unkeyed for more than a second at a time.
BinaryMode
Blondie Once Said To Call Her But Never Answerd
Good god! Talk about part 15 of the FCC rules... LOL!
Go ahead, talk about it...
Tell us you know nothing about what 47 CFR Part 15 covers, without telling us you don't know what 47 CFR Part 15 covers. I see you've gone first.
I'll link 47 CFR Part 1, Part 15, and finally Part 22 so you can do the research you have clearly never done.
John_S
Member
I found a list of all the pager VHF and UHF frequencies and programmed them into a spare scanner and let it go. I didn't even need the antenna plugged in to get 157.740 making a racket. That and all the data links around 454 mHz. It's a wonder I can get anything on the scanner at all.
chrismol1
P25 TruCking!
- Joined
- Mar 15, 2008
- Messages
- 1,310
in saratoga springs you will get slammed on 157.74. that is local high power paging and also used for the area hospital pagers. The 454s is the trunked DMR system putting out good power as well.
Hey all, rehashing an old topic here one more time just to see if maybe there is some fresh insight. I've got a two-scanner setup at my house for a couple Broadcastify feeds I maintain. They are fed by a rooftop antenna which is a good location at my house with long lines of site in all directions and pretty good elevation.
Something seems to be knocking down my reception as I can't get a couple frequencies that I CAN get when I'm down at ground level in my car with a mobile antenna. I believe it's a very strong pager signal or something similar, possibly from the hospital nearby. I say this because on some of the weaker frequencies I can hear the pager noise in the background sometimes. Also, on the rare occasion that my reception is NOT being affected by this, I can pick up more stuff, farther way with much stronger signals. During those times I've manually tuned my scanner to the pager frequencies and I don't hear them. This hasn't happened in a while though, the pager signal has been consistent, 24/7.
I've tried the following:
- Different antenna's at different heights
- Different types of coax (LMR400 vs RG6, etc)
- Attenuation settings in my scanners
- In-line adjustable attenuator
- PAR filters for the specific pager frequencies
None of these things have made any difference. Before I just resort to the fact that I'll need to live with hampered reception, I just want to see if there is anything else I can try, or any other ideas out there or equipment to try to help mitigate this problem.
Now, I'm still not 100% sure it's these pager signals that are causing the problem. But everything I've been able to test has pointed that way.
Thanks in advance for reading and for all the great info on these forums. Of course questions are welcome.
Something seems to be knocking down my reception as I can't get a couple frequencies that I CAN get when I'm down at ground level in my car with a mobile antenna. I believe it's a very strong pager signal or something similar, possibly from the hospital nearby. I say this because on some of the weaker frequencies I can hear the pager noise in the background sometimes. Also, on the rare occasion that my reception is NOT being affected by this, I can pick up more stuff, farther way with much stronger signals. During those times I've manually tuned my scanner to the pager frequencies and I don't hear them. This hasn't happened in a while though, the pager signal has been consistent, 24/7.
I've tried the following:
- Different antenna's at different heights
- Different types of coax (LMR400 vs RG6, etc)
- Attenuation settings in my scanners
- In-line adjustable attenuator
- PAR filters for the specific pager frequencies
None of these things have made any difference. Before I just resort to the fact that I'll need to live with hampered reception, I just want to see if there is anything else I can try, or any other ideas out there or equipment to try to help mitigate this problem.
Now, I'm still not 100% sure it's these pager signals that are causing the problem. But everything I've been able to test has pointed that way.
Thanks in advance for reading and for all the great info on these forums. Of course questions are welcome.
tvengr
Well Known Member
I had a similar problem with scanners in our newsroom. We got a tunable notch filter. I tuned it to the pager frequency and put it in the antenna line. Problem solved!
Thanks, I’ve tried pre-tuned notch filters with no luck, can you give me an idea of what filters you used? And how you determined what frequency was the problem?
ecps92
Member
You need to listen/search with a 2nd radio to find the similar interference occurring to nail down the culprit
Or get a Spectrum Analyzer and look at the band to see if you see any correlated spikes to when you have issues.
