Search found 36 matches

by vk3alb
Sat Nov 10, 2018 11:04 pm
Forum: SDR Antennas
Topic: A FOOLPROOF ANTENNA SWITCH
Replies: 26
Views: 7158

Re: A FOOLPROOF ANTENNA SWITCH

Thank you to Glovisol for his excellent and elegant circuit. As he says in his text there is a way to protect the receiver in case of failure of the 12 volt supply to the circuit. I think my version of his circuit was his intention. RX Isolator.png Consider the modifications of his circuit as shown ...
by vk3alb
Sat Oct 13, 2018 9:23 pm
Forum: SDRplay related
Topic: RSP1A - RF Damaged?
Replies: 5
Views: 3178

Re: RSP1A - RF Damaged?

Hi John,

How do you know it is damaged?
What tests have you carried out?
Most things are repairable - for a price.
If it really is damaged your first stop is to seek advice from SDRplay support
by vk3alb
Sun May 20, 2018 8:54 am
Forum: SDRplay related
Topic: HOW ABOUT A TRACKING GENERATOR?
Replies: 3
Views: 2486

Re: HOW ABOUT A TRACKING GENERATOR?

One of our group is working on a spectrum analyzer package for the SDRplay. He talks about the challenges of including a tracking generator.

viewtopic.php?f=12&t=3164
by vk3alb
Wed Apr 11, 2018 6:43 am
Forum: General
Topic: Creating a 12 volt bias T for any RSP model
Replies: 2
Views: 2232

Re: Creating a 12 volt bias T for any RSP model

I don't understand your concept of reverse in this description. It sounds like you are simply planning to use the bias tee the correct way. The tee has a DC supply input. This DC is fed to the coax/socket that goes to the preamp/antenna system. The remaining coax/socket has a DC block (capacitor) an...
by vk3alb
Wed Jan 31, 2018 7:27 pm
Forum: General
Topic: Enough protection with antenna switch?
Replies: 10
Views: 6356

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: 8319

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: 8319

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: 4824

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: 4824

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: 6028

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.

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