Search found 81 matches

by vk7jj
Thu May 24, 2018 2:47 am
Forum: SDR Antennas
Topic: Newbie RF frontend protection Qs
Replies: 12
Views: 1325

Re: Newbie RF frontend protection Qs

If 7 volts is applied to the input (+27 dBm) the bulb will have 6 volts across it and be lit with an on resistance of 40 ohms. Why would there be just 7 volts at the input? Why wouldn't 7,000 volts be any more likely or unlikely? If we accept that the resistance is 40 ohms at 150ms what would it be...
by vk7jj
Thu May 24, 2018 12:49 am
Forum: SDR Antennas
Topic: Newbie RF frontend protection Qs
Replies: 12
Views: 1325

Re: Newbie RF frontend protection Qs

The filament bulb is there to act as a fuse to protect the diodes if the RF level is too high. Hi Roger, I appreciate that is the intention and I won't comment further because we're straying from the SDRPlay sandpit. I wouldn't have commented at all except for my own concern that people might embra...
by vk7jj
Wed May 23, 2018 7:49 am
Forum: SDR Antennas
Topic: Newbie RF frontend protection Qs
Replies: 12
Views: 1325

Re: Newbie RF frontend protection Qs

Sadly, filament globes take ages to achieve maximum resistance and even when they do the resistance value is not even a tiny speed bump from the point of view of the value and time of fast rising voltages as per not so close lightning or PTT keying of transceivers into nearby antennas. https://www.p...
by vk7jj
Sun May 20, 2018 10:23 pm
Forum: SDRplay related
Topic: RSP1A PC software on a Mac-is it possible
Replies: 3
Views: 126

CrossOver Mac

I was wondering if anyone has tried running the PC software on their Mac OSX running the Program called CrossOver Hi Greg, you could try CrossOver for free and let us all know ;-) https://www.codeweavers.com/products/crossover-mac/download As someYguy says some of us use a Windows virtual machine w...
by vk7jj
Thu May 17, 2018 8:21 am
Forum: SDR Antennas
Topic: Cheap broadband planar elliptical dipole antenna
Replies: 5
Views: 529

Re: Cheap broadband planar elliptical dipole antenna

Congratulations on your innovation and thanks very much for your efforts and in sharing, it's interesting and appreciated. Very nice SWR figures too :) I might whip one up using stiff bronze fly-screen material with some sort of simple frame to assist with the radials and have a play. Regards Phil V...
by vk7jj
Thu May 17, 2018 8:03 am
Forum: General
Topic: Clear Recommended Computer requirements (for RSP on a Laptop)
Replies: 9
Views: 4148

Re: Clear Recommended Computer requirements (for RSP on a Laptop)

I definitely think that the manufacturer should give the host PC requirements for every model of the Radio Spectrum Processor. Please don't consider these comments any sort of rebuke but imho the software you use with the RSP and the audio card are significant factors and that makes for such a rang...
by vk7jj
Tue May 08, 2018 10:11 pm
Forum: Spectrum Analysis
Topic: RSP Spectrum analyser software available shortly
Replies: 49
Views: 7005

Re: RSP Spectrum analyser software available shortly

I wonder if a modified RSP could be used to provide the tracking signal. Confessing my utter ignorance of the architecture but supposing it's a single conversion superhet providing direct conversion in zero IF mode, I don't know how the IF offset is generated - whether digitally in the passband or v...
by vk7jj
Mon May 07, 2018 5:51 am
Forum: Spectrum Analysis
Topic: RSP Spectrum analyser software available shortly
Replies: 49
Views: 7005

Re: RSP Spectrum analyser software available shortly

Hi again Steve, looking at your screen dumps makes me actually feel elated ... of course it's your hard work and our pleasure but it sure is pleasure! Brief (selfish) thoughts in response - thanks for the info on noise floor, that's excellent, very satisfying. And it's really good to be able to look...
by vk7jj
Fri May 04, 2018 3:27 am
Forum: SDR Antennas
Topic: Discone Antenna
Replies: 6
Views: 899

Re: Discone Antenna

Try the forum search facilities at the top-right of the page to have a browse, it's a question that's been asked before, eg:

search.php?st=0&sk=t&sd=d&sr=posts&keywords=discone&fid%5B%5D=8&start=10

Cheers,

Phil VK7JJ
by vk7jj
Thu Apr 19, 2018 10:20 pm
Forum: Spectrum Analysis
Topic: RSP Spectrum analyser software available shortly
Replies: 49
Views: 7005

Re: RSP Spectrum analyser software available shortly

That's wonderful Steve, what a surprise. Rather a step up from where we were at on this thread! All of us on the forum will be ecstatic you chose to support SDRPlay hardware. Out of curiosity I wonder how far below the displayed -130dBm before things get too noisey, and if/how you've managed to jugg...

Go to advanced search