Captain715
Member
I have a TK-690 mobile installed in a fire truck, that is having some sporadic receive issues. I will give a brief system setup, then explain what is happening.
The following communications equipment is installed in a 2009 Crimson Custom Pumper:
1) TK-690 (programmed in the 33MHz range, primary TX/RX of 33.64)
2) Pyramid SVR-250U (operating 450 - 470MHz)
3) Midland STX (Operating 150.995MHz)
4) WiFi/GPS/Cellular antenna for WiFi Hotspot and GPS receive for Mobile MappingSoftware
5) Panasonic Toughbook laptop in a mobile dock
Antennas are all located on the front of a 22" raised roof cab, giving as much separation as physically possible, locations are as follows (I will attach photo of the roof as soon as I get one):
1) VHF-Lo on driver side rear
2) UHF on driver side front
3) VHF on passenger rear
4) WiFi/GPS/Cellular is on passenger front
Antennas are staggered front to back, front being toward the center and rear to the outside,taking into account the roof mounted air conditioning unit in the center of the roof and the lightbar mounted on the front edge of the roof.
The issue that is occurring is sporadic and so far I can not reproduce it. When the Kenwood is set to receive on 33.64, it has been receiving 33.72 clearly. This has occurred about 4 times in the past 6 months or so. I had the radio tech out 3 times for this issue so far, and we have nothing out of spec. We currently have the squelch open just slightly below being deaf (.32uV I believe), and the front end is as tight as it will go. deviation is very low (below Kenwood factory spec's). We have even gone as far as to feed 33.72 directly into the radio using a service monitor, and still were not able to reproduce the problem. I am sure the signal is being received through the Kenwood, as each time this has occurred, the Pyramid repeater has been powered off.
Any suggestions as to where to look next, or what to try, I am open for ideas.
The following communications equipment is installed in a 2009 Crimson Custom Pumper:
1) TK-690 (programmed in the 33MHz range, primary TX/RX of 33.64)
2) Pyramid SVR-250U (operating 450 - 470MHz)
3) Midland STX (Operating 150.995MHz)
4) WiFi/GPS/Cellular antenna for WiFi Hotspot and GPS receive for Mobile MappingSoftware
5) Panasonic Toughbook laptop in a mobile dock
Antennas are all located on the front of a 22" raised roof cab, giving as much separation as physically possible, locations are as follows (I will attach photo of the roof as soon as I get one):
1) VHF-Lo on driver side rear
2) UHF on driver side front
3) VHF on passenger rear
4) WiFi/GPS/Cellular is on passenger front
Antennas are staggered front to back, front being toward the center and rear to the outside,taking into account the roof mounted air conditioning unit in the center of the roof and the lightbar mounted on the front edge of the roof.
The issue that is occurring is sporadic and so far I can not reproduce it. When the Kenwood is set to receive on 33.64, it has been receiving 33.72 clearly. This has occurred about 4 times in the past 6 months or so. I had the radio tech out 3 times for this issue so far, and we have nothing out of spec. We currently have the squelch open just slightly below being deaf (.32uV I believe), and the front end is as tight as it will go. deviation is very low (below Kenwood factory spec's). We have even gone as far as to feed 33.72 directly into the radio using a service monitor, and still were not able to reproduce the problem. I am sure the signal is being received through the Kenwood, as each time this has occurred, the Pyramid repeater has been powered off.
Any suggestions as to where to look next, or what to try, I am open for ideas.