To: rsgb_lf_group@blacksheep.org
References: <1934937394.20160518170418@chriswilson.tv>
 <8D8E6474-E8CF-4C87-B097-6502B8180CE3@talktalk.net>
From: pat <g4gvw@aol.com>
Message-ID: <573D7653.5040902@aol.com>
Date: Thu, 19 May 2016 09:16:19 +0100
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Subject: Re: LF: Can LF damage a mains input filter?
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Status: O

Even better, Try KODI. It is a Free and Open Source internet tv system 
that works across platforms and provides a plethora of tv program 
sources including stuff from NASA (livestreams from ISS) ESA, iPlayer 
etc. Many users simply use a RaspPi.

73 de pat g4gvw

On 18/05/16 22:23, Mal Hamilton wrote:
> 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 <chris@chriswilson.tv> 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:chris@chriswilson.tv
>>
>> My        part        time        LF        grabber       is       at
>> http://www.chriswilson.tv/grabber.html
>>
>>

-- 
73 de Pat G4GVW
QTH Nr. FELIXSTOWE
EAST COAST UK