Elad FDM S2 weird images.

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Paul_Logan
Posts: 93
Joined: 24 Sep 2014 12:58
Location: County Fermanagh, Ireland

Elad FDM S2 weird images.

Post by Paul_Logan » 13 Jun 2018 20:00

Hi all,

here's an odd question. Ever come home and turn on your Elad SDR to find weird images from your local FM transmitter at lowish but very annoying level all over the place?

I've seen this happen a few times and each time I have stopped the software turned off the rx restarted and it has (sometimes after a few attempts) stopped giving me a clean band again.

Tonight I can't get it to stop.

Anyone else seen this happen? Any ideas how to resolve it?

I ran my SDRPlay rsp1 and it isn't exhibiting the same signals so it isn't a fault at the transmitter.

I'm stumped.

?.
Paul Logan
Lisnaskea, Fermanagh, N. Ireland IO64GG

FMDX: Perseus or Elad FDM-S2 with 5 el Yagi by K6STI

Low VHF: Uniden BCT15X with various loops / Dipoles etc.

MW / SW: Perseus or Elad FDM-S2 with Inverted L wire.

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Paul_Logan
Posts: 93
Joined: 24 Sep 2014 12:58
Location: County Fermanagh, Ireland

Re: Elad FDM S2 weird images.

Post by Paul_Logan » 14 Jun 2018 12:28

And 18 hours later - the images are gone - answers on a postcard please.
Paul Logan
Lisnaskea, Fermanagh, N. Ireland IO64GG

FMDX: Perseus or Elad FDM-S2 with 5 el Yagi by K6STI

Low VHF: Uniden BCT15X with various loops / Dipoles etc.

MW / SW: Perseus or Elad FDM-S2 with Inverted L wire.

Tim Bucknall
Posts: 2045
Joined: 01 Oct 2014 14:55
Location: Congleton, often in the Peak District
Contact:

Re: Elad FDM S2 weird images.

Post by Tim Bucknall » 22 Jun 2018 14:37

no i'm still stumped
one afternoon in 1991 96.4 sprogged across the band on my sony ICF 2001D, i had to do homework so couldn't investigate.
when i came back it was gone
Home:Burkhardt Reuter RDR54D1 SDR V.415,
+ CLP 5130 Log P ant

Mobile: Comm Radio CR-1 + Sharman Skyscan ant, Pira P275

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Paul_Logan
Posts: 93
Joined: 24 Sep 2014 12:58
Location: County Fermanagh, Ireland

Re: Elad FDM S2 weird images.

Post by Paul_Logan » 22 Jun 2018 17:13

And it gets weirder. The images come and go - one thing is clear though - it happens when it rains and when things dry up - gone again. Bizarre.
Paul Logan
Lisnaskea, Fermanagh, N. Ireland IO64GG

FMDX: Perseus or Elad FDM-S2 with 5 el Yagi by K6STI

Low VHF: Uniden BCT15X with various loops / Dipoles etc.

MW / SW: Perseus or Elad FDM-S2 with Inverted L wire.

satnipper
Posts: 884
Joined: 03 Oct 2014 12:58
Location: Western Europe

Re: Elad FDM S2 weird images.

Post by satnipper » 22 Jun 2018 18:01

Ah - you should have said that earlier....

Probably a loose connection somewhere which allows in moisture when raining. If you take out the coax earth connection on Band II signals you get some strange effects due to the high signal strengths.

Stuart

Tim Bucknall
Posts: 2045
Joined: 01 Oct 2014 14:55
Location: Congleton, often in the Peak District
Contact:

Re: Elad FDM S2 weird images.

Post by Tim Bucknall » 25 Jun 2018 13:10

alternatively,
have you got a large metal structure nearby?

Jodrell Bank Radio telescope re-radiates mixing products across the Band when it gets wet, luckily i very rarely get any dx of note in the rain and i can null it out anyway

low level signals and annoying at first when i thought my rx was overloading but now i know what they are they fascinate me

if its this and not a loose connection you may be surprised by some of the signals being reradiated - in my case Tacolneston as well as local crap
Home:Burkhardt Reuter RDR54D1 SDR V.415,
+ CLP 5130 Log P ant

Mobile: Comm Radio CR-1 + Sharman Skyscan ant, Pira P275

User avatar
Paul_Logan
Posts: 93
Joined: 24 Sep 2014 12:58
Location: County Fermanagh, Ireland

Re: Elad FDM S2 weird images.

Post by Paul_Logan » 14 Jul 2018 23:17

And it's at it again tonight. I'm not sure if it's moisture getting in somewhere but the aerial is due a good check up. If i add in the least little bit of attenuation the problem disappears. Odd.
Paul Logan
Lisnaskea, Fermanagh, N. Ireland IO64GG

FMDX: Perseus or Elad FDM-S2 with 5 el Yagi by K6STI

Low VHF: Uniden BCT15X with various loops / Dipoles etc.

MW / SW: Perseus or Elad FDM-S2 with Inverted L wire.

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