Search found 22 matches

by vk3alb
Wed Jan 31, 2018 7:27 pm
Forum: General
Topic: Enough protection with antenna switch?
Replies: 5
Views: 430

Re: Enough protection with antenna switch?

I think it's important that every user take heed of what radioham has found. Doing a measurement like this put him in control of protecting his own gear and gives him some understanding of his own systems performance. One thing he could do is add a second changeover relay in the RX leg that switches...
by vk3alb
Sun Dec 24, 2017 11:24 pm
Forum: General
Topic: RSP2 RF Protection Question
Replies: 11
Views: 1510

Re: RSP2 RF Protection Question

Thanks Support, It strikes me that 75W is quite a bit of power for satellite work but I don't know Jim's situation. I suggested low power TX because that will offer Jim nearly 19dB of extra protection during testing. Assuming no losses in the system(s) 1W = 30dBm add 50dB attenuation = -20dBm = a sa...
by vk3alb
Sun Dec 24, 2017 9:38 pm
Forum: General
Topic: RSP2 RF Protection Question
Replies: 11
Views: 1510

Re: RSP2 RF Protection Question

Hi Jim, I think you first need to assure yourself that your scenario won't blow out your RSP. In this situation +10dBm is a HUGE signal and if S9 = -93dBm then according to support S9 + 103dB is the absolute maximum signal level you should ever measure at the input to the RSP. If you don't have meas...
by vk3alb
Sun Nov 26, 2017 7:20 pm
Forum: SDRplay related
Topic: RSP2 USB failure?
Replies: 7
Views: 1027

Re: RSP2 USB failure?

Hi Phil,

Indeed a good result.
by vk3alb
Sat Nov 25, 2017 12:22 pm
Forum: SDRplay related
Topic: RSP2 USB failure?
Replies: 7
Views: 1027

Re: RSP2 USB failure?

Hi Phil,

Can you share the solution with us?
by vk3alb
Fri Nov 10, 2017 9:51 pm
Forum: New Users' experiences
Topic: RSP-2 with TS590SG
Replies: 7
Views: 1483

Re: RSP-2 with TS590SG

Hi Robert,

This morning I had a chance to review my previous statement. A 100W CW signal shows -92dB (~S6) on the SDRUno S meter.
by vk3alb
Wed Nov 08, 2017 2:17 am
Forum: General
Topic: Can you use the SDRPlay2 as a pan adapter?
Replies: 8
Views: 1503

Re: Can you use the SDRPlay2 as a pan adapter?

Hi James, The answer is yes. Just remember 0dBm max at the input of the RSP. I'm not familiar with the TS-870 but I imagine at worst you could tap off some of the IF or use an external antenna switch. There is plenty of info in this group. I did a search for Panadapter and got 132 hits. http://www.s...
by vk3alb
Tue Oct 31, 2017 9:21 pm
Forum: General
Topic: Automated Field Strength Measurements
Replies: 2
Views: 562

Re: Automated Field Strength Measurements

Hi Stereo100, Sorry for not answering your question directly. If you are the support person for these stations then I recommend you try Radio Mobile . If you have the TX details (PWR, antenna height, feedline loss) it will plot a very accurate coverage map of the terrain surrounding the site. The pl...
by vk3alb
Sun Oct 29, 2017 2:11 am
Forum: SDR Antennas
Topic: Best gauge of wire
Replies: 2
Views: 938

Re: Best gauge of wire

Hi WV8DOF,

The most important thing about wire gauge for a receiving antenna is to ensure it strong enough to survive out in the elements without breaking. I use stranded copper wire 7x0.029" strung between trees. It survives for years without breaking.
by vk3alb
Tue Oct 24, 2017 8:37 am
Forum: General
Topic: Another odd signal (or signal-like phenomenon)
Replies: 4
Views: 1007

Re: Another odd signal (or signal-like phenomenon)

It's probably a chirp used to measure ionospheric conditions.

Google "chirp sounder radio" to learn a bit more about them. As a traditional radio listener you'd just hear a quick squeak as it swept through the pass band.

The magic of SDR that you can see these things as well as hear them.

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