I was bored last night and looked through the FCC records for bands commonly used for "link extenders" for WV agencies who are on lowband.
Typically these are 72-75 Mhz frequencies and 450-460 Mhz frequencies. The 70 Mhz frequencies aren't monitorable by all scanners... a lot of Uniden scanners have coverage on 70 Mhz, but typically the GREs and RSs do not.
These "link extenders" are similar to the UHF annd 70 Mhz extenders you see on the WVSP. They aren't "repeaters". You typically are not going to hear all traffic (mobiles and bases) on one frequency, alhough there are reports that the Berkeley extender is actually a repeater that repeats base/mobile traffic on one frequency.
Anyway, back on track... Typically the WVDOH has a site up on a hill with good coverage. It is capable of listening and transmitting on the 47 Mhz low-band DOH frequencies. When it hears traffic on the 47 Mhz frequencies it can retransmit that traffic on 70 Mhz or UFH back to the base using one of the two channels in the pair. The bases transmit back to the mountaintop location using the other half of the pair and then the mountaintop site retransmits the traffic from the base back out on the 47 Mhz frequencies.
So you could hear traffic on either side of the pair of frequencies, but you likely won't hear both sides of the conversation. It can be helpful for those listen to DOH if they program in the extender frequencies in their area, as they may be close enough to the "relay" site that they can hear the mobile activity being transmitted back to the bases even if they can't hear the mobiles directly on 47 Mhz.
I'm sure I didn't explain that very clearly.... of course most people would find no interest in this anyway.
If anybody is interested in the list of "relay" pairs culled from FCC records, you can find the listing in the RadioReference Wiki at the following link:
Department of Highways (WV) - The RadioReference Wiki
NOTE: None of these are confirmed to be in use except for those which are specifically listed in the WVDOH section of the RadioReference database. If you do hear traffic on any of these frequency pairs that you confirm is DOH activity, you might want to consider collecting the PL tones used and hten submit that information to the WVDOH section of the RadioReference DB for others to benefit from that knowledge.
Thanks
Mike
Typically these are 72-75 Mhz frequencies and 450-460 Mhz frequencies. The 70 Mhz frequencies aren't monitorable by all scanners... a lot of Uniden scanners have coverage on 70 Mhz, but typically the GREs and RSs do not.
These "link extenders" are similar to the UHF annd 70 Mhz extenders you see on the WVSP. They aren't "repeaters". You typically are not going to hear all traffic (mobiles and bases) on one frequency, alhough there are reports that the Berkeley extender is actually a repeater that repeats base/mobile traffic on one frequency.
Anyway, back on track... Typically the WVDOH has a site up on a hill with good coverage. It is capable of listening and transmitting on the 47 Mhz low-band DOH frequencies. When it hears traffic on the 47 Mhz frequencies it can retransmit that traffic on 70 Mhz or UFH back to the base using one of the two channels in the pair. The bases transmit back to the mountaintop location using the other half of the pair and then the mountaintop site retransmits the traffic from the base back out on the 47 Mhz frequencies.
So you could hear traffic on either side of the pair of frequencies, but you likely won't hear both sides of the conversation. It can be helpful for those listen to DOH if they program in the extender frequencies in their area, as they may be close enough to the "relay" site that they can hear the mobile activity being transmitted back to the bases even if they can't hear the mobiles directly on 47 Mhz.
I'm sure I didn't explain that very clearly.... of course most people would find no interest in this anyway.
If anybody is interested in the list of "relay" pairs culled from FCC records, you can find the listing in the RadioReference Wiki at the following link:
Department of Highways (WV) - The RadioReference Wiki
NOTE: None of these are confirmed to be in use except for those which are specifically listed in the WVDOH section of the RadioReference database. If you do hear traffic on any of these frequency pairs that you confirm is DOH activity, you might want to consider collecting the PL tones used and hten submit that information to the WVDOH section of the RadioReference DB for others to benefit from that knowledge.
Thanks
Mike
Thanks for the info!
