Search found 36 matches

by vk7jj
Thu Dec 14, 2017 2:24 am
Forum: SDRuno
Topic: sdrUno CAT
Replies: 1
Views: 48

Re: sdrUno CAT

edit: sorry about the spellers and camelcase habit when rendering sdrUno etc, plus baud error in the post above, tried to edit the post but got into some sort of loop asking me for "at least two poll options" and had to back out. Anyway, did a bit more digging during lunch and see that AN;...
by vk7jj
Wed Dec 13, 2017 10:47 pm
Forum: SDRuno
Topic: sdrUno CAT
Replies: 1
Views: 48

sdrUno CAT

Hi; A few thoughts about sdrUno 1.2 CAT • Bug? The IF data that is sent by sdrUno every second by default is sent three times every time it's sent, which appears to be a bug, ie. from my debug console I get three x IF00007090000 in one hit, accompanied by a single SM00002, whereas a single IF would ...
by vk7jj
Wed Dec 06, 2017 5:43 am
Forum: General
Topic: RSP1A: wobbling spurs around 2.335MHz * n
Replies: 13
Views: 875

Re: RSP1A: wobbling spurs around 2.335MHz * n

I don't listen much above 160 m these days, but I think the upper roll-off must be pretty slow as MW and 160 both seem just as lively as ever. Hi again Andy, I must try your approach, extending the bottom rolloff downwards so as to preserve general HF operation is all I've done. Thanks for your com...
by vk7jj
Wed Dec 06, 2017 5:38 am
Forum: General
Topic: RSP1A: wobbling spurs around 2.335MHz * n
Replies: 13
Views: 875

Re: RSP1A: wobbling spurs around 2.335MHz * n

Just tried your websdr on my smart phone (since I'm at work and company firewall blocks non standard ports) and it worked fine. Heard a EA7 station on 40m SSB. Nice! Excellent. Did a bit of fine tuning: - increased the dynamic range of the waterfall and reset it's default level - removed audio and ...
by vk7jj
Tue Dec 05, 2017 1:21 am
Forum: General
Topic: RSP1A: wobbling spurs around 2.335MHz * n
Replies: 13
Views: 875

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: 13
Views: 875

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: 13
Views: 875

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: 13
Views: 875

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: 453

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: 6
Views: 569

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...

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