Quantar Howl
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Quantar Howl
Having some issue with the Quantar howl at the end of some transmissions. If you have not heard this sound then please Youtube "Motorola Quantar Howling" and you can hear it very clear and this is exactly what mine sounds like at times randomly. Any fix?!?
Re: Quantar Howl
A little help
http://www.youtube.com/watch?v=SRfvh0UTFHw
I've worked a problem like the video before. It's simulcast howl caused by local desense in the antenna. In our case, the antenna was too close to other structures. Busy site, and all antennas were in the same horizontal plane. Stupidest mess I had ever seen. So, if you have THAT howl, you probably have a bad antenna or duplexer someplace.
http://www.youtube.com/watch?v=SRfvh0UTFHw
I've worked a problem like the video before. It's simulcast howl caused by local desense in the antenna. In our case, the antenna was too close to other structures. Busy site, and all antennas were in the same horizontal plane. Stupidest mess I had ever seen. So, if you have THAT howl, you probably have a bad antenna or duplexer someplace.
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motorola_otaku
- Posts: 1854
- Joined: Tue Jan 13, 2004 7:03 am
Re: Quantar Howl
Using braided coax on the full-duplex side (i.e. anywhere between the duplexer output and antenna) will also cause that. BTFDT.
Re: Quantar Howl
huh?motorola_otaku wrote:BTFDT.
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motorola_otaku
- Posts: 1854
- Joined: Tue Jan 13, 2004 7:03 am
Re: Quantar Howl
been there effing done thatd119 wrote:huh?motorola_otaku wrote:BTFDT.
IMD and desense from braided coax on a repeater feed line is a sore subject for me.
Re: Quantar Howl
I agree. It can be anything in the transmission chain from the duplexer input to the antenna.
Re: Quantar Howl
Window filters are your friend