Thank you. I turned on global attenuation this morning and DID receive the signal I've been having trouble with but I haven't been able to listen long enough to see if it is consistent. I'll listen some more, then try to add attenuation to just the frequency I'm trying to receive and see what happens. Thanks.
Sudden Loss of Reception
- Thread starter emsflyer84
- Start date
I believe pressing Func + 7 turns on ATT for that frequency, correct me if I'm wrong. Is IFX something different?
ecps92
Member
IFX might eliminate your issue (if it is mixing/image) without filters, but I will let those who have that make/model give you directions.
Thanks, just looking into this, I'll figure out how to try IFX on that specific frequency. Wonder if it's worth trying IFX AND the global ATT since that's seemed to help a bit.
I am 1/2 mile from a very powerful rail base station. when they TX, all my VHF is gone.
I set up a 4 element Yagi toward the station and fed that 180 degrees out of phase to my discone.
VHF is back but still not perfect.
6 Db attenuator helps excep for very distant signals.
I set up a 4 element Yagi toward the station and fed that 180 degrees out of phase to my discone.
VHF is back but still not perfect.
6 Db attenuator helps excep for very distant signals.
Ubbe
Member
I foolishly thought it was the same 7 on all Uniden scanners, but it is Fn+4 on the 996.
You shouldn't have to use Att at all on 996 if a 436 didn't overload, although it where using a smaller antenna.
/Ubbe
Ubbe
Member
Are you using a noise eliminator type of device that have an adjustable phase control? Try separating antennas as much as possible to make it cancel in as a small angle width as possible. You can also insert different lengths of small coax cables to one antenna to fine adjust the 180 angle for that specific frequency wavelength. Look at the signal strength of the rail base to adjust for minimum signal. The signal from both antennas from the rail base needs to be at as equal signal level as possible to eliminate it the most, but perhaps just reducing it to half might be sufficient.
/Ubbe
There has been a VHF band opening the last few days here in the Midwest , not sure if your area is included which may enhance your troubling frequency, you press F+4 for IFX on the frequencys in question,....
OP has been chasing this issue since the new year.
It is nothing fancy, the critical part is the tuned length of coax to a T connector. Up or down in frequency is a different phase shift so not so much 'bucking'.
This is the same technique I used on cable head ends to eliminate ghost.
It is effective enough reducing that unwanted signal by about 7 Db.
That base station is pumping no less than 150 watts to a super station master, I get about a +40 Db with no antenna connected.
Hey all, just curious about this because I'm in the process of trying to mitigate some strong pager signals that seem to be overloading my scanners when using my rooftop antenna. So, just curious more then anything.... the strong pager noise I'm hearing on 152.600 and 157.740 at my house in central NH, what is the noise I'm hearing? What are those signals used for? Video for reference. Thanks!
mmckenna
I ♥ Ø
Text/numeric pagers. Many users still out there. Hospitals really like them. Some paging carriers still exist.
Using an SDR and free software such as PDW along with Virtual Audio Cable or VB Audio Cable, you too can decode this jibberish on your computer! Then you'll know exactly what pagers are used for these days. 
I periodically monitor 157.740 using PDW and VB Audio Cable. It's a mix of automated systems "phoning home" and medical facilities passing intradepartmental messages. From my QTH near Albany, NY, I pick up hospitals in southern Vermont. Since you consider this to be "interference", be thankful that pagers aren't being used with the frequency they used to be many years ago! You'd be tearing your hair out, LOL!
I periodically monitor 157.740 using PDW and VB Audio Cable. It's a mix of automated systems "phoning home" and medical facilities passing intradepartmental messages. From my QTH near Albany, NY, I pick up hospitals in southern Vermont. Since you consider this to be "interference", be thankful that pagers aren't being used with the frequency they used to be many years ago! You'd be tearing your hair out, LOL!
With atrocious ERP's.
ecps92
Member
did you confirm it is actually BOTH 152.600 and 157.7400 or just one of them??
I know in the prior thread(s) we suggested checking those two as they are the more Common VHF in your area.
Yes, confirmed, I think it was you who made the recommendation to check these, thanks for that. I even pick these up almost as strong using the rubber antenna on my handheld scanner driving around town. Very strong signals. See videos below.
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mmckenna
I ♥ Ø
Yep, because of the:
Some of these paging transmitters are running 300+ watts (transmitter x antenna gain) from very good locations.
They're trying to get a good signal way into the basement of the hospital, behind the Xray machine to a device with a little tiny antenna.
Your scanner doesn't stand a chance if you are close to these guys.
ecps92
Member
let's back up a bit, are you 100% certain you are getting them BOTH at the identical time ??
Asking as these are two different Paging Carriers/Provider and which one did you match up to hearing in the background
when you are monitoring Conway PD
Asking as well as a 152 Filter is not the same as the 157 filter and you may only need one of them
Thanks, seems like everyone in the country would be having the issues I'm having! I think it's a combination of my rooftop antenna, my houses physical elevation on a hill with direct LOS to several towers around the area, the local hospital only a mile away, also with direct LOS to my antenna....
No, I have NOT been that scinetific yet. It just seems like both of those pager transmitters are basically always transmitting 24/7. I haven't matched them up with the noise I heard in the static on the Conway frequency.
