Search found 42 matches

by vk7jj
Tue Dec 05, 2017 1:21 am
Forum: General
Topic: RSP1A: wobbling spurs around 2.335MHz * n
Replies: 17
Views: 2595

Re: RSP1A: wobbling spurs around 2.335MHz * n

They do if you get the right ferrite. I'm a low frequency enthusiast and I feed my Wellbrook 1530 loop to the High-z input via a homemade balun made from a ferrite binocular core of 'mix N30', RS part no 212-0617. This couples really well down to a few KHz (virtually lossless down as far as 20 KHz ...
by vk7jj
Sun Dec 03, 2017 10:24 pm
Forum: General
Topic: RSP1A: wobbling spurs around 2.335MHz * n
Replies: 17
Views: 2595

Re: RSP1A: wobbling spurs around 2.335MHz * n

These components are marked SKY 3416 Ironic, being an antenna switch, can't see what function three of them perform given their useful spec is well above HF. Well sleuthed, but one suspects that's the end of that, it's hard to see a user-based solution. Otherwise I prefer the RSP1A to the RSP2 on t...
by vk7jj
Sun Dec 03, 2017 6:23 am
Forum: General
Topic: RSP1A: wobbling spurs around 2.335MHz * n
Replies: 17
Views: 2595

Re: RSP1A: wobbling spurs around 2.335MHz * n

they show up more at low gain settings and almost disappear into the noise as you turn the gain up. That's not the case here, sadly; cooling the RSP1A down a little forced it's 3rd harmonic up into the 40m band. You can see it wandering down past 7.120MHz as the RSP warms up. It's quite intrusive, ...
by vk7jj
Sat Dec 02, 2017 1:58 am
Forum: General
Topic: RSP1A: wobbling spurs around 2.335MHz * n
Replies: 17
Views: 2595

Re: RSP1A: wobbling spurs around 2.335MHz * n

I detected a wobbly (unstable) spur in the 7MHz amateur band which is not present with the RSP1. Tuning through the HF band, I found the fundamental frequency at about 2.335 MHz. Thanks for that; yes. RSP1A - from a cold start the fundamental here is at 2.27MHz and drifts down to settle close to 2....
by vk7jj
Wed Nov 29, 2017 7:51 am
Forum: General
Topic: SDRplay questions
Replies: 3
Views: 803

Re: SDRplay questions

Some really broad generalisations to get the thread started: 1) You can have a look for yourself at 3-10Mhz propagation, check at different times of day: http://wsprnet.org/drupal/wsprnet/map 2) I hope to build a PA0RDT mini whip antenna soon: a very poor antenna for the above, you're bumping your b...
by vk7jj
Mon Nov 27, 2017 10:37 pm
Forum: SDR Antennas
Topic: Why you should avoid RG-58
Replies: 8
Views: 1896

Re: Why you should avoid RG-58

What about lan cable? Any experience in that? I happened to read something about twisted pair for rx antenna feed. In a 5mm cable you can have 4 twisted pair... it could do the work of 4 coax. I've experimented with it, if it can conduct multiple gigabit square waves over a hundred meters - and squ...
by vk7jj
Mon Nov 27, 2017 9:59 pm
Forum: SDR Antennas
Topic: Why you should avoid RG-58
Replies: 8
Views: 1896

Re: Why you should avoid RG-58

Sorry, can't help myself, great topic ;-) There's other factors that influence this. If it was ladder line or a twisted pair instead of coax it wouldn't have any "coax shielding" yet we all know it still has just fine noise immunity because the wanted signal is present as a differential be...
by vk7jj
Sat Nov 25, 2017 11:00 pm
Forum: SDRplay related
Topic: RSP2 USB failure?
Replies: 7
Views: 1012

Re: RSP2 USB failure?

Hi Lou, Sorry if my post sounded cryptic, the answer is warranty ... https://www.sdrplay.com/community/viewtopic.php?f=6&t=2695 I didn't think about warranty; after the RSP2 died I missed it so much I ordered an RSP1A from Strictly Ham which I now have and can say it performs beautifully. Meanwh...
by vk7jj
Sat Nov 25, 2017 7:25 am
Forum: SDRplay related
Topic: RSP2 USB failure?
Replies: 7
Views: 1012

Re: RSP2 USB failure?

Just a closing note to say thank you so much to everyone at SRDPlay who were not just quick and efficient but went out of their way to be as helpful as possible, and thank you for the unanticipated resolution, it is much appreciated.

Sincerely,

Phil
by vk7jj
Thu Nov 23, 2017 1:48 am
Forum: SDRplay related
Topic: RSP2 USB failure?
Replies: 7
Views: 1012

Re: RSP2 USB failure?

Thank you, done.

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