PSR500/PSR600: Hanging VHF Freq (1 only) in PSR-600

[Car150]

I have a Grecom PSR-600 that is programmed with 5 VHF freq and a variety of P25- Type 2 trunk systems. Trunk working fine, but 1 of the VHF freq is showing up on screen "stalling or hanging there for 3-5 sec) with no audio. Any suggestions how to eliminate this occurring ?? Using ARC500 program.

 

[ScannerSK]

Did you remove the delay for that channel? Can you add a PL/CTCSS tone to that channel? When you manually enter that frequency and monitor it with the squelch turned down do you hear anything other than static (try AM mode if possible)? It sounds like there is some type of signal present on that frequency or possibly adjacent to that frequency that is stopping the scan cycle. If you lockout the offending channel does another VHF channel start to act up and do the same thing?

 

[Car150]

Did you remove the delay for that channel? Can you add a PL/CTCSS tone to that channel? When you manually enter that frequency and monitor it with the squelch turned down do you hear anything other than static (try AM mode if possible)? It sounds like there is some type of signal present on that frequency or possibly adjacent to that frequency that is stopping the scan cycle. If you lockout the offending channel does another VHF channel start to act up and do the same thing?

Thanks for the response. Yes, I did remove the delay for that channel.....but did not seem to make a difference. I did think that maybe it was some ghosting ....I have 3 scanners stacked (2 operating) but it appeared to be a problem only when I added the Trunk Freq/codes . It serves as my Broadcastify feed. Never thought of the AM mode...will try that. Maybe the old fashioned tin foil wrapping of the coax...who kows. And no...when it locks on that freq no sound and when I opened up the squelch...just static..nothing else. Thanks for the response...will try change to "AM" mode and see if it continues to work with no interference.

 

[a417]

IMHO, this sounds like your scanner is picking up a birdie or an oscillation from one of the other units in the stacked configuration.

1. Is it always the same unit with the same frequency?
2. Are they all attached to the same signal path (antenna & feedline)?
3. If 1 is yes, if you move the offending scanner away from the other two, does the problem persist?
4. If 1 & 2 are yes, can you separate them out to separate antenna/feedlines?
5. If 1 is yes, and 2 is no, does physically separating the units help the problem?
6. If 1 is no, then you could have a locally overpowering frequency that is mixing with something else at your location causing the units to all desense on that frequency.

This is the road I'd be heading down.

 

[wtp]

it could be a birdie,
from the manual,
Birdie Frequencies Every scanner has birdie frequencies. Birdies are signals created inside the scannerʼs receiver. These operating frequencies might interfere with transmissions on the same frequencies. If you program one of these frequencies, you hear only noise on that frequency. If the interference is not severe, you might be able to turn SQ clockwise to omit the birdie. To find the birdies in your scanner, begin by disconnecting the antenna and moving it away from the scanner. Make sure that no other nearby radio or TV sets are turned on near the scanner. Use the TUNE function and scan every frequency range from its lowest frequency to the highest. Occasionally, the searching will stop as if it had found a signal, often without any sound. This is a birdie. Make a list of all the birdies in your scanner for future reference.

and it could be picking up the I.F., or a mix product, of another radio, especially if they are close.
the I.F. is a very low power transmission inside every radio.
so if you hear is on one radio, is another radio stopped on something at that time ?
and even the reverse is possible, that the signal is present when scanning and gone when stopped.
in other words, watch the other radios.

https://www.rigpix.com/gre/psr600_manual.pdf

 

[ScannerSK]

I don't believe it would be a birdie as that would be a constant signal.

If it is from the other scanners, then it should cease to be a problem when the other scanners are turned off.

In the Denver area, my PSR-600 shows a signal present on the signal strength meter across the entire 160-174 MHz band due to interference from a television signal just above 174 MHz. The PSR-600 suffers from many different RF issues much more so than Uniden scanners. It may be temporary intermod (from the mixing of two other signals) or an out of band transmission that is spiking the RF signal meter when no signal is actually present on that frequency. You may be able to hear the interference in AM mode if the frequency is monitored for a while with the squelch turned down.

At times, I've had an issue very similar occur, maybe identical, when a specific frequency is the very first frequency to be scanned after the scanner has completed scanning a digital trunked system. Does your trouble frequency have the lowest numbered object ID of all the conventional objects? If yes, I would duplicate the conventional object and then delete the original conventional object. This will have the effect of rearranging things so a different frequency (conventional object) will become the first one to be scanned in the scan cycle which may eliminate the problem.

I'm surprised the scanner is hanging on the frequency for 3-5 seconds when no delay is assigned and the squelch is not breaking. It could be an adjacent frequency up or down .0125 MHz or so. You might try narrow band FM for that conventional object if not already set to narrow band FM.

I hope something here helps and you are able to solve the mystery.

Shawn

 

[wtp]

he does not say he turned off the other scanners...