[Lowfer] Wolf with SDR-IQ

[Nick Nicholson]

The ham radio story iS A hoax


----- Original Message ----- 
From: "Laurence BY3A-KL1X China" <hellozerohellozero at hotmail.com>
To: <k3siw at sbcglobal.net>; <lowfer at mailman.qth.net>
Sent: Thursday, April 09, 2009 9:31 AM
Subject: Re: [Lowfer] Wolf with SDR-IQ



No problems decoding WOLF 10 on LF with my SDR-IQ - it isnt the best 
stability wise at HF (but still meets spec) when subject to heat and 
cold...around and up to 10Hz - mine in calibrated at 21C..



The divide by offset when it gets down to LF means mine holds pretty well 
and I dont see any short term jitter as long as I dont run too many apps 
(the WSPR map really does screw it up if I try to get the latest map of 
contacts) - I can run Argo plus WOLF and it doesnt seem to complain - but it 
is and does use up a lot of brain power



Filter setting - well doesnt make too much odds but for LF I keep around 
500Hz BW SSB USB cos of my bad hearing, min AGC 100mS (wish it was less) and 
Zero delay settings is a must. No noise blanker on and 0db RF and IF gains 
otherwise in my case it gets messy. Dual channel mono output to keep things 
simple.



PC is a Dell with basic mem and speed. Im running 2.34 at the moment but 
thanks for the heads up on Spec 3



Regards

Laurence KL1 X in BY3A



> Date: Thu, 9 Apr 2009 08:10:32 -0500
> From: k3siw at sbcglobal.net
> To: lowfer at mailman.qth.net
> Subject: [Lowfer] Wolf with SDR-IQ
>
> Short-term frequency jitter precludes copy of narrowband signals like
> Wolf using the SDR-IQ. Does anyone have a different experience? Have
> users found other SDR equipment that works with Wolf?
>
> My SDR-IQ experience is as follows:
>
> While trying to get Winrad to work with the SDR-IQ, an email exchange
> with Jeffrey Pawlan indicated that due to the use of separate
> oscillators for the SDR-IQ and the PC sound card, narrowband signals
> like WSPR, PSK31, etc. would have too much jitter to be copied. Despite
> this issue, the latest SpectraVue and Spectrum Laboratory codes do allow
> copy of narrowband modes down to QRSS-60 with the SDR-IQ and ARGO.
> Perhaps that's because ARGO/QRSS is so forgiving. Although the waterfall
> does display Lowfer sources running QRSS, the displays are
> thinner/weaker than those obtained using an analog radio. That's a hint
> that all is not perfect and software attempts to match the frequencies
> perfectly from two separate sources are noticeable. When a GPS-locked
> reference frequency is measured with Wolf, the output variations over
> time are so large it's clear Wolf can't work well.
>
> Incidentally, a number of problems were encountered using the SDR-IQ
> with SpectraVue 2.34 code. All were solved by the latest beta code,
> SpectraVue 3.
>
> 73,
> Garry, K3SIW, EN52ta, Elgin, IL
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