I am programming a VHF HT1250 to listen to a local Fire Department, I get everything squared away and program, but when I am listening in on audio, every transmission sounds garbled and has alot of static, is there anything I am doing wrong? The dispatch frequency is just a normal Vhf frequency.
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HT1250 Problem?
- Thread starter FirstDue5
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clbsquared
Member
Make sure you have it set to narrow band. 12.5 spacing, not 25. Double check your frequencies and PL/DPL tones. Do you have the correct antenna? It could be a number if things. Your radio could possibly need to be aligned.
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davidzimmerman
Member
i say its in WIDE BAND not NARROW BAND
Nope, it is at 12.5.
RFI-EMI-GUY
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Normally, if a radio is listening in wideband mode to a narrow band TX, there will be reduced audio level, not distortion. Now if their TX is wideband and the radio set to narrow band, there will indeed be noise and distortion.
1 make sure your local FD has completed narrow banding. If their licence reflects a waiver, they may still be in wideband, or no waiver and they are in violation of FCC NB mandate.
2 make sure your radio is programmed for the appropriate bandwidth. If narrow band, try turning compandoring feature off. Or on if they use compandoring.
3 make sure your radio is operating on frequency. It is surprising how far they might drift in a couple years.
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RFI-EMI-GUY
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Normally, the frequency might drift. Check using a frequency counter in the TX mode. You need the CPS tuner software to adjust it.
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clbsquared
Member
What department are you trying to monitor?
Cherokee County Ga
davidzimmerman
Member
shows 154.220 PL-141.3 shows it is NarrowBand in the data base
clbsquared
Member
As does the FCC ULS system. Emission designator code is 11K2F3E
It's not like it's a low signal, I'm in the county. It's just garbled. It helped a little to turn companding off. It has the NAD6502 Vhf antenna on it.
clbsquared
Member
Does it have this issue no matter where the radio is? If you're outside in an open area with no visible obstructions, does it still have static and sound garbled? VHF handhelds have a lot of RX and TX issues inside structures and in moving vehicles.
Are you sure its garbled? maybe muffled would be a better use? i usually dont associate analog with garbled.
davidzimmerman
Member
i like to know what frequency i did guess but he never said what it is
MTS2000des
5B2_BEE00 Czar
Sounds like it either needs an alignment, or it could have a bad front end filter.
Either way, it needs to be put on the bench and checked out with proper test equipment.
The Cherokee VHF system is pretty robust and you should be getting stellar receive with a decent portable, unless you are deep inside someplace like the outlet mall or in the low spots around Waleska.
12dbsinad
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If they aren't using companding then it should be off or it will not sound good... Have you looked at the RX audio settings? Is it Disabled, Compressed, Low-Level, etc?
It could be something like a bad speaker... do you have a RSM to plug in and try?
RFI-EMI-GUY
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Also try moving the radio to a different location to rule out local interference, like from a PC or plasma TV. Still my money is on the reference oscillator off frequency.
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