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Groups > uk.tech.broadcast > #57226
| From | "J. P. Gilliver (John)" <G6JPG@255soft.uk> |
|---|---|
| Newsgroups | uk.tech.broadcast |
| Subject | Re: Weird pulsating carrier on fm |
| Date | 2021-04-27 15:14 +0100 |
| Organization | 255 software |
| Message-ID | <5c2O8$z3wBigFw9z@255soft.uk> (permalink) |
| References | <s677jq$pki$1@dont-email.me> <q7P6lBjesyhgFwUo@255soft.uk> <s68i2q$631$1@dont-email.me> |
On Tue, 27 Apr 2021 at 09:30:16, "Brian Gaff (Sofa)" <briang1@blueyonder.co.uk> wrote (my responses usually follow points raised): >OK Here is Chessington in Surrey or London depending on your view. Is there no local amateur radio (or similar) group you could team up with to go hunting with? > Its less than ten seconds and does not vary. I'm using an Icom Is it 24h? (If not, that might affect whether people can join you hunting it - it'd have to be on when they're free.) >communications receiver so its pretty accurate. As accurate as its various crystals; I doubt they're ovened, so - I'm out of touch, but from what I remember non-ovened will get you something like 5-10 ppm (before ageing). (Unless it's locked to a broadcast standard.) 10ppm at 88 MHz would be 8.8 kHz. Though this doesn't really matter for the purpose of this exercise. > I've listened to it in am and FM, That is how I know there is a pirate >under it, but weaker, as I had considered a jammer. > The wobble is as you would get if you were powering something up and then >turning it off, it eventually stabilises and there is very little if any hum >in am or fm. I see. > >No the 88Mhz is far the most powerful carrier. I'm using a discone aerial, >which has no particular preference in its receiving properties between a >whole range of vhf frequencies, but may of course have some lobes at >different frequencies that you may not be ale to discern. > If you really can't find someone to go DFing with you (I'd have thought it'd be quite fun, in this sunny weather): has your discone any nulls you can determine? Failing that, can you make up something - a dipole on a pole, if nothing else? Note that nulls are often much sharper than maxima, certainly with a dipole. > Have you established whether it's vertical, horizontal, slant, or mixed (such as circular)? > > >Its right on the edge or indeed inside the fm band, so is hardly going to be Inside: IIRR, band II starts at 87.5 MHz. >coms related, unless it is some spurii generated by some piece of equipment >locally, but to have such a wide coverage it sounds like it has a proper >aerial or it would be patchy. Trying it on a cheapo portable fm set its >still present, so is not some artefact in the receiver either. I have proved Can you put your "cheapo portable" in a metal box (old Christmas sweet tin, biscuit tin, etc. - at 88 MHz, the seal wouldn't have to be that good), and connect it to the directional aerial, so you can go hunting? >its not in my place by walking some distance away down the back ally. > Brian > Could you go further - e. g. accompanied by a dog walker or similar, to help you with trip hazards, traffic, protection, etc., or is your health not up to that? All assuming you can't find a local ham group or similar who I'd have thought _ought_ to be very interested in tracking it down. -- J. P. Gilliver. UMRA: 1960/<1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf How do you govern a country that seems to have decided that facts are the work of the devil? - Andy Hamilton on HIGNFY, 2010
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Weird pulsating carrier on fm "Brian Gaff \(Sofa\)" <briang1@blueyonder.co.uk> - 2021-04-26 21:25 +0100
Re: Weird pulsating carrier on fm "J. P. Gilliver (John)" <G6JPG@255soft.uk> - 2021-04-26 22:05 +0100
Re: Weird pulsating carrier on fm "Brian Gaff \(Sofa\)" <briang1@blueyonder.co.uk> - 2021-04-27 09:30 +0100
Re: Weird pulsating carrier on fm liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2021-04-27 10:50 +0100
Re: Weird pulsating carrier on fm MB <MB@nospam.net> - 2021-04-27 11:17 +0100
Re: Weird pulsating carrier on fm "Brian Gaff \(Sofa\)" <briang1@blueyonder.co.uk> - 2021-04-28 22:56 +0100
Re: Weird pulsating carrier on fm williamwright <wrightsaerials@f2s.com> - 2021-04-28 23:56 +0100
Re: Weird pulsating carrier on fm "J. P. Gilliver (John)" <G6JPG@255soft.uk> - 2021-04-27 15:14 +0100
Re: Weird pulsating carrier on fm "J. P. Gilliver (John)" <G6JPG@255soft.uk> - 2021-04-27 15:19 +0100
Re: Weird pulsating carrier on fm MB <MB@nospam.net> - 2021-04-27 15:33 +0100
Re: Weird pulsating carrier on fm tony sayer <tony@bancom.co.uk> - 2021-04-28 10:50 +0100
Re: Weird pulsating carrier on fm MB <MB@nospam.net> - 2021-04-28 12:48 +0100
Re: Weird pulsating carrier on fm John Williamson <johnwilliamson@btinternet.com> - 2021-04-28 12:52 +0100
Re: Weird pulsating carrier on fm charles <charles@candehope.me.uk> - 2021-04-28 13:35 +0100
Re: Weird pulsating carrier on fm MB <MB@nospam.net> - 2021-04-28 14:31 +0100
Re: Weird pulsating carrier on fm MB <MB@nospam.net> - 2021-04-28 14:28 +0100
Re: Weird pulsating carrier on fm charles <charles@candehope.me.uk> - 2021-04-28 15:01 +0100
Re: Weird pulsating carrier on fm williamwright <wrightsaerials@f2s.com> - 2021-04-28 18:15 +0100
Re: Weird pulsating carrier on fm charles <charles@candehope.me.uk> - 2021-04-28 18:47 +0100
Re: Weird pulsating carrier on fm williamwright <wrightsaerials@f2s.com> - 2021-04-28 23:51 +0100
Re: Weird pulsating carrier on fm "J. P. Gilliver (John)" <G6JPG@255soft.uk> - 2021-04-28 20:26 +0100
Re: Weird pulsating carrier on fm williamwright <wrightsaerials@f2s.com> - 2021-04-28 23:55 +0100
Re: Weird pulsating carrier on fm "J. P. Gilliver (John)" <G6JPG@255soft.uk> - 2021-04-29 02:52 +0100
Re: Weird pulsating carrier on fm williamwright <wrightsaerials@f2s.com> - 2021-04-29 19:58 +0100
Re: Weird pulsating carrier on fm Dave W <davewi11@yahoo.co.uk> - 2021-04-28 11:16 +0100
Re: Weird pulsating carrier on fm charles <charles@candehope.me.uk> - 2021-04-28 11:43 +0100
Re: Weird pulsating carrier on fm "Brian Gaff \(Sofa\)" <briang1@blueyonder.co.uk> - 2021-04-29 10:20 +0100
Re: Weird pulsating carrier on fm "J. P. Gilliver (John)" <G6JPG@255soft.uk> - 2021-04-29 16:04 +0100
Re: Weird pulsating carrier on fm charles <charles@candehope.me.uk> - 2021-04-29 16:51 +0100
Re: Weird pulsating carrier on fm "J. P. Gilliver (John)" <G6JPG@255soft.uk> - 2021-04-29 21:16 +0100
Re: Weird pulsating carrier on fm williamwright <wrightsaerials@f2s.com> - 2021-04-29 21:34 +0100
Re: Weird pulsating carrier on fm "J. P. Gilliver (John)" <G6JPG@255soft.uk> - 2021-04-29 21:55 +0100
Re: Weird pulsating carrier on fm "Brian Gaff \(Sofa\)" <briang1@blueyonder.co.uk> - 2021-04-30 08:07 +0100
Re: Weird pulsating carrier on fm MB <MB@nospam.net> - 2021-04-29 21:52 +0100
Re: Weird pulsating carrier on fm "J. P. Gilliver (John)" <G6JPG@255soft.uk> - 2021-04-29 22:05 +0100
Re: Weird pulsating carrier on fm Dave W <davewi11@yahoo.co.uk> - 2021-04-29 16:54 +0100
Re: Weird pulsating carrier on fm "Brian Gaff \(Sofa\)" <briang1@blueyonder.co.uk> - 2021-04-30 08:09 +0100
Re: Weird pulsating carrier on fm Dave W <davewi11@yahoo.co.uk> - 2021-04-30 17:36 +0100
Re: Weird pulsating carrier on fm "Brian Gaff \(Sofa\)" <briang1@blueyonder.co.uk> - 2021-04-30 12:27 +0100
Re: Weird pulsating carrier on fm "J. P. Gilliver (John)" <G6JPG@255soft.uk> - 2021-04-30 12:49 +0100
Re: Weird pulsating carrier on fm "Brian Gaff \(Sofa\)" <briang1@blueyonder.co.uk> - 2021-04-30 14:13 +0100
Re: Weird pulsating carrier on fm williamwright <wrightsaerials@f2s.com> - 2021-04-30 14:16 +0100
Re: Weird pulsating carrier on fm "Brian Gaff \(Sofa\)" <briang1@blueyonder.co.uk> - 2021-05-01 07:44 +0100
Re: Weird pulsating carrier on fm Dave W <davewi11@yahoo.co.uk> - 2021-04-30 17:53 +0100
Re: Weird pulsating carrier on fm charles <charles@candehope.me.uk> - 2021-04-30 18:20 +0100
Re: Weird pulsating carrier on fm "Brian Gaff \(Sofa\)" <briang1@blueyonder.co.uk> - 2021-05-01 07:48 +0100
Re: Weird pulsating carrier on fm "Brian Gaff \(Sofa\)" <briang1@blueyonder.co.uk> - 2021-05-01 07:46 +0100
Re: Weird pulsating carrier on fm "Brian Gaff \(Sofa\)" <briang1@blueyonder.co.uk> - 2021-05-01 11:51 +0100
Re: Weird pulsating carrier on fm "J. P. Gilliver (John)" <G6JPG@255soft.uk> - 2021-05-01 12:57 +0100
Re: Weird pulsating carrier on fm Dave W <davewi11@yahoo.co.uk> - 2021-05-02 09:51 +0100
Re: Weird pulsating carrier on fm MB <MB@nospam.net> - 2021-05-02 10:11 +0100
Re: Weird pulsating carrier on fm Laurence Taylor <laurence@nospam.plus.com> - 2021-05-02 16:21 +0100
Re: Weird pulsating carrier on fm Dave W <davewi11@yahoo.co.uk> - 2021-05-03 17:43 +0100
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