On 1/9/2011 10:09 PM, John Geiger wrote:
> I know that HF and 6m can cause pretty good cases on TVI, even with someone
> on cable TV due to overloading the front end of the TV, but how does 2m and
> 70cm tend to affect TVI? Does TVI tend to be less at the higher frequencies?
The only TVI (from home) I've ever had was from 2-meters on channel 12.
with no direct harmonic relationship.
OTOH when mobile watch out for leakage on cable Ch 18 as the audio
subcarrier is 145.25. If we can here them the likely hood they will hear
us is very high. This can be particularly bad if some one hooks up
cable and leaves the outside antenna hooked up directly instead of
through an A/B switch.
So far I've been lucky on 6-meters as channel 2 adjoins 6-meters
directly and any nearby 2-meter receiver, including using ch 2 for
linking VCRs and DVRs is likely to be easily overloaded. Newer DVRs
allow using UHF channels up to 73 or 76. Older ones use both ch 2 and ch
3. Switching to ch 3 should alleviate *some* 6-meter problems. Cable
channel 65 is the same as OTA channel 2. So a set top box listening to
ch 65 and sending to the TV set on Ch 2 would be hit on both the input
and output.
OTA UHF channels 45 is 438-444 MHz with channel 44 being just below the
433 link frequencies. I've not heard of problems with these but it's
not unlikely. Cable channels 101 and 102 are in the 432 to 450 range.
(IOW in or partly in the 440 band)
73
Roger (K8RI)
> 73s John AA5JG
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