[Lowfer] Wolf with SDR-IQ

Thu Apr 9 09:31:06 EDT 2009

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
> ______________________________________________________________
> Lowfer mailing list
> Home: http://mailman.qth.net/mailman/listinfo/lowfer
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Lowfer at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

_________________________________________________________________
Rediscover Hotmail®: Get e-mail storage that grows with you. 
http://windowslive.com/RediscoverHotmail?ocid=TXT_TAGLM_WL_HM_Rediscover_Storage1_042009