Chris
Avoid TV amps
Change over to Freesat to avoid all the problems you describe
It is cheap and easy to install yourself
De Mal/g3kev
G3KEV
On 18 May 2016, at 17:04, Chris Wilson <[email protected]> wrote:
> 18 May 2016
>
>
> Long story, but since stopping LF 136kHz TX for a while in lieu of
> some HF working all the digital TV's in the house freeze or totally
> blank on all bands above top band, up to 50MHz when I transmit at more
> than about 5 or 10W. I have a loft mounted UHF TV aerial feeding an
> amplifier cum distribution box. It has an internal mains PSU. Without
> it we receive hardly any channels. It's been fine for years, and I
> have never had TVI. My HF set up is unchanged from when I had no
> issues. I put the TV antenna co-ax direct into my SA and on circa 531
> MHZ see a broad digiTV signal that's strong. If I TX on say 20 meters
> at high power into my antenna I see zero change in the TV signal. I
> have also fed the output of my HF TX (TS-590 Kenwood) into the SA via
> an attenuator and the output looks spotless on all bands. However, if
> I connect the TV aerial amp / distribution box up and look at the
> output from it the TV signal immediately drops into the noise when I
> TX. My neighbours have no issues at all.
>
> This seems to have occurred since I have been active on LF, and I had a
> stage where full power would trip the main RCD in the consumer unit,
> so RF was getting into the mains. Is it conceivable something has
> occurred to perhaps a mains filter in the TV amp? I looked inside the
> plastic case and it has a small mains transformer that feeds feed
> throughs into a screening can with all the RF stuff within it. If
> there is any mains input filtering it must be on the low voltage side
> of the transformer. The unit has a moulded on three pin mains plug, but
> with a plastic earth pin, so the unit is not grounded.
>
> Is it possible to make a mains input filter for a piece of equipment
> that would filter 136kHz but not affect normal 50Hz mains operation?
>
> Has anyone experienced anything like this?
>
> I have ordered a new amp / distribution box of known make, and will
> just try replacing it, but would also like to know if my LF activity
> could have done this?
>
> Thanks.
>
>
>
> --
>
>
> Best regards,
> Chris 2E0ILY mailto:[email protected]
>
> My part time LF grabber is at
> http://www.chriswilson.tv/grabber.html
>
>
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