RedPenguin
Member
- Joined
- Feb 28, 2007
- Messages
- 1,081
Many scanners use a 10.7MHz IF, meaning they have a local oscillator (internal transmitter) that is tuned 10.7Mhz away from the desired frequency to be received and the mixer in the scanner converts the desired frequency to 10.7MHz for further filtering and processing downstream. Its common for many scanners to radiate its internal local oscillator out through the antenna jack and into the air for a short distance.
Let's see, your 464.175 frequency in the Regency, minus 10.7MHz for its internal local oscillator equals 453.475MHz, what a coincidence!
Try disconnecting any external antenna on the Regency and see if the interference goes away. If so you can probably use a very low gain, low noise amplifier in front of the Regency and that will reduce the radiated local oscillator interference quite a bit. There is a good chance its just leaking through a plastic case on the Regency and aside from shielding the case you might not be able to improve things much.
prcguy
Looks like I am probably just out of luck.
It seems the Regency can broadcast the RFI in to different rooms even if you remove the antenna.
EDIT: To "solve" the problem, we just set the Regency to 469.175 (Input) as they really only cared about local traffic not traffic from other areas that comes across the repeater.
So they still get to hear exactly what they want without causing problems on the other channel.
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