Elad FDM-S2 actual freq range

SDR receiver discussion
Post Reply
Tim Bucknall
Posts: 3296
Joined: 01 Oct 2014 14:55
Location: Now stranded in Congleton
Contact:

Elad FDM-S2 actual freq range

Post by Tim Bucknall »

I'm posting this as its the sort of thing i'd have liked to know

The VHF portion will work down to 71.67mhz with no loss of gain and up to at least 179.325 but with a drop off in sensitivity
lack of local signals in the 180-184 range means i can't be more precise but by 185mhz you're seeing spurious images

seems like the whole vhf airband is useable despite the "out of band" message no loss of gain noted
Rx: Burkhardt Reuter RDR54D1, Elad FDM-S2, Airspy HF+ w/ HS Publications 6 Element R3 -R5 Yagi on rooftop rotator V/H polarization options. Pira P275 RDS analyser

User avatar
John Faulkner, Skegness
Posts: 7178
Joined: 19 Sep 2014 15:55
Location: Skegness, Lincolnshire. JO03dd
Contact:

Re: Elad FDM-S2 actual freq range

Post by John Faulkner, Skegness »

Interesting. I have never explored this on the FDM-S2. I guess most SDRs will tune outside their stated range to some degree.

satnipper
Posts: 1260
Joined: 03 Oct 2014 12:58
Location: Western Europe

Re: Elad FDM-S2 actual freq range

Post by satnipper »

The S2 uses the undersampling technique for vhf bands but not the air band from 108-135. Though the performance is not too degraded apparently.

Tim Bucknall
Posts: 3296
Joined: 01 Oct 2014 14:55
Location: Now stranded in Congleton
Contact:

Re: Elad FDM-S2 actual freq range

Post by Tim Bucknall »

should i start another thread for the airspy HF+ or use this one?

i haven't found the upper limit yet but its at least 270mhz (official upper limit is 260) i use it for the entire satcom band.
never had reason to tune above 270 so far

i'd love to know if it will go down to 55.25 but i don't have an rf source to test on and carriers on that freq are rare these days
Rx: Burkhardt Reuter RDR54D1, Elad FDM-S2, Airspy HF+ w/ HS Publications 6 Element R3 -R5 Yagi on rooftop rotator V/H polarization options. Pira P275 RDS analyser

Jim (Bournemouth)
Posts: 441
Joined: 18 Sep 2014 05:59
Location: Bournemouth, Dorset IO90BR
Contact:

Re: Elad FDM-S2 actual freq range

Post by Jim (Bournemouth) »

My antenna analyser will produce a signal.. I'll experiment with both SDRs when I get time
Jim, Bournemouth, Dorset. IO90BR.

Elad FDM-S2, Perseus/FM+, Airspy HF+, SDRPlay, Funcube Dongle SDR Rx; 8-ele OP-DES for Band 2, 8-ele LFA 2m, 3 ele LFA for 6m, 20/15/10m dipole, VHF vertical
.

Image

Tim Bucknall
Posts: 3296
Joined: 01 Oct 2014 14:55
Location: Now stranded in Congleton
Contact:

Re: Elad FDM-S2 actual freq range

Post by Tim Bucknall »

thanks mate
Rx: Burkhardt Reuter RDR54D1, Elad FDM-S2, Airspy HF+ w/ HS Publications 6 Element R3 -R5 Yagi on rooftop rotator V/H polarization options. Pira P275 RDS analyser

Tim Bucknall
Posts: 3296
Joined: 01 Oct 2014 14:55
Location: Now stranded in Congleton
Contact:

Re: Elad FDM-S2 actual freq range

Post by Tim Bucknall »

no idea what i was doing before when it only tuned down to 71.67
I'm now listening to the 70 mhz buxton beacon on the Elad
Rx: Burkhardt Reuter RDR54D1, Elad FDM-S2, Airspy HF+ w/ HS Publications 6 Element R3 -R5 Yagi on rooftop rotator V/H polarization options. Pira P275 RDS analyser

Post Reply

Return to “SDR Receivers”