For demanding FM DX'er ... (18 bits ADC SDR)

FM receiver discussion
daveB
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Re: For demanding FM DX'er ... (18 bits ADC SDR)

Post by daveB » 08 Mar 2018 13:33

Tim,
SDR# software can 'infinitely' change the bandwidth or you can overtype the bandwidth number. You can also use the supplied plug-in "Zoom FFT" - which I find much more convenient. For FM-DXing I set the bandwidth at 140 kHz which is wide enough not to adversely affect RDS reception - any narrower and the RDS sensitivity goes down. Then if I need to I can slide the either edge of the filter to remove interference - it is amazing how just pulling in one side by 20 kHz or so sufficiently removd interference to allow the RDS to decode.

You must of course install the MPX Output plug-in and Virtual Audio cable in order to pipe a signal to RDSSpy - as it has a much more sensitive PI detector. Then you could consider the RDSDataLogger plug in from Andy Pritchard for unattended monitoring of SpE openings, or Keff Knapps fully fledged scanner......

You are going to enjoy this device immensely.
SDRPlay, AirSpyMini, RTL dongles, SB920s, Yamaha TX930. 5 ele compact yagi on rotator at 18ft agl. FM5 facing east, FM5 facing south, FM3 facing NE, OIRT dipole, 3-ele Moxon vertical facing east.

pe1etr
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Re: For demanding FM DX'er ... (18 bits ADC SDR)

Post by pe1etr » 08 Mar 2018 13:36

Tim Bucknall wrote:
08 Mar 2018 12:41
OK a specific question, with the supplied software can fm b/w be infinitely varied?
30khz would be nice for satcom
i know it seems wierd to buy an sdr for just part of the mil air band but all the ones offering the full band at this price are flawed in some way.
anyway it sound like it will hear more on fm than my elad
and it would be nice to have access to lower oirt on a sdr

ps: apparently its 660khz IQ, don't knock those extra 60k, thats 2 more oirt channels! :D

looks like the weather will keep me stuck inside and bored crazy for at least another 2 weeks so i've bought airspy + and will prob get that data 808 portable
There is no 'supplied' software. You are free to choose.
You can have any IF bandwidth you like up to 250 kHz in the 'recommended' SDR# software.

pe1etr
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Re: For demanding FM DX'er ... (18 bits ADC SDR)

Post by pe1etr » 08 Mar 2018 13:56

Audio clips comparison on HF (& one on MW) of Airspy HF+ (using SDR-Console v3 software) with Elad FDM-S2.
https://dk8ok.org/2017/12/06/airspy-hf- ... t-you-get/

Peter

Tim Bucknall
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Re: For demanding FM DX'er ... (18 bits ADC SDR)

Post by Tim Bucknall » 08 Mar 2018 15:40

thank you both
sounds perfect! and 2+ months to learn how to use it before the E season!
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Patrick73
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Re: For demanding FM DX'er ... (18 bits ADC SDR)

Post by Patrick73 » 08 Mar 2018 15:53

I found the 'R3' mode quite effective on the NDB band, and even more on LF/VLF of course. From what I know, there's no need to perform the mod with the most recent batches (done from factory), but ask to be sure it's OK.
The recent firmware updates also improved the HF+ performance (HF only, not VHF).

My HF+ in action on FM and MW :
https://www.youtube.com/watch?v=bsO99M-Br1c
https://www.youtube.com/watch?v=U98csAB9udo
Patrick
Main interests : NDB, MW & FM DX'ing
REU Editor http://www.classaxe.com/dx/ndb/reu

Tim Bucknall
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Re: For demanding FM DX'er ... (18 bits ADC SDR)

Post by Tim Bucknall » 08 Mar 2018 19:37

I won't be able to use HF/MF/LF functions here anyway because of noise
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zach_m
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Re: For demanding FM DX'er ... (18 bits ADC SDR)

Post by zach_m » 08 Mar 2018 20:41

Tim Bucknall wrote:
08 Mar 2018 15:40
thank you both
sounds perfect! and 2+ months to learn how to use it before the E season!
Tim,

It's nothing to be scary. I had pretty much the same feelings whilst ordering since it's my first SDR ever. Everything is very intuitive. It's very easy to learn how to use the device and how to install plugins etc. Once you do it once, you'll see how easy it can be. I find Airspy HF+ to be excellent SDR, but it has some cons as well. Like every SDR the sound is tiny. I would love to have some more control over the sound tones, but might be it just me? People saying I have audiophile ears and I hear sounds that they don't hear. So it's definitely, me!

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Patrick73
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Re: For demanding FM DX'er ... (18 bits ADC SDR)

Post by Patrick73 » 09 Mar 2018 06:58

Hi Zach ! I don't find the sound to be tiny, especially when running Studio 1 software. It offers superior audio quality compared with SDR# or SDR Console. You shoud give SDRuno a try (same product but with limited features if not used along with a a RSP).
BTW, I own quality headphones (Beyerdynamic DT990) but a 'basic' soundcard
Patrick
Main interests : NDB, MW & FM DX'ing
REU Editor http://www.classaxe.com/dx/ndb/reu

Tim Bucknall
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Re: For demanding FM DX'er ... (18 bits ADC SDR)

Post by Tim Bucknall » 10 Mar 2018 13:25

Thanks for encouraging me gents, its up and running, I notice the extra FM gain.

Its great to have milair/SATCOM back, I lost the band when I traded in my ic-9500 for a new computer, an rdr pocket , & the elad

Well radio maria blowtorches on 245.2 has gone, shame but faithful weak 243.625 Vatican relay is still here - now obscured by legit data traffic from the us military
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Tim Bucknall
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Re: For demanding FM DX'er ... (18 bits ADC SDR)

Post by Tim Bucknall » 10 Mar 2018 14:28

SDR sharp crashes when i try to record audio or iq but the good news is theres working coverage above the stated limit of 260mhz, i haven't found the edge yet

one possible weak intermittent mixing product on 247.05, sounds like Radio stoke + paging tx but its not going to be a problem
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Tim Bucknall
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Re: For demanding FM DX'er ... (18 bits ADC SDR)

Post by Tim Bucknall » 10 Mar 2018 15:32

Coverage up to at least 270mhz noted with no fall off in gain fwiw. SATCOM transponders all where they should be
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Patrick73
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Re: For demanding FM DX'er ... (18 bits ADC SDR)

Post by Patrick73 » 12 Mar 2018 13:39

Tim Bucknall wrote:
10 Mar 2018 14:28
SDR sharp crashes when i try to record audio or iq
Hi Tim !

No such issue here running SDR# v1645 and HF+ with 1.6.2 firmware. OS is W10.
Patrick
Main interests : NDB, MW & FM DX'ing
REU Editor http://www.classaxe.com/dx/ndb/reu

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