30-01-2017, 07:21 PM
Rob
I wasn't sure how valuable a low cost ( < $20) SDR dongle would be before I bought it but, with the right software and figuring out how to use that, it is beginning to look better all the time. It will never replace a proper spectrum analyser but doesn't do a bad job for what it cost. Just as an aside, I fed my sig gen into it yesterday and it was seeing well better than -120dBm at 70CM.
The QRM saga continuing:
I contacted Doug VK4OE by phone this morning and asked him to connect his spectrum analyser to an antenna and check for the travelling spurious. He got back to me this afternoon to advise that the paging carrier was about -30dBm and the spurs were about 30dB below that (ie -30dBc).
I tried phoning the Mater Hospital after that and received no information but did ask for my contact details to be passed on to the people who looked after their pocket pager system, the same ones who were apparently there trying to fix pager issues (but probably not the RF ones). No phone calls back yet.
Will update further as things become closer to resolution, meanwhile the pager continues to hammer the three voice repeaters.....
I wasn't sure how valuable a low cost ( < $20) SDR dongle would be before I bought it but, with the right software and figuring out how to use that, it is beginning to look better all the time. It will never replace a proper spectrum analyser but doesn't do a bad job for what it cost. Just as an aside, I fed my sig gen into it yesterday and it was seeing well better than -120dBm at 70CM.
The QRM saga continuing:
I contacted Doug VK4OE by phone this morning and asked him to connect his spectrum analyser to an antenna and check for the travelling spurious. He got back to me this afternoon to advise that the paging carrier was about -30dBm and the spurs were about 30dB below that (ie -30dBc).
I tried phoning the Mater Hospital after that and received no information but did ask for my contact details to be passed on to the people who looked after their pocket pager system, the same ones who were apparently there trying to fix pager issues (but probably not the RF ones). No phone calls back yet.
Will update further as things become closer to resolution, meanwhile the pager continues to hammer the three voice repeaters.....
Doug VK4ADC @ QG62LG51
http://www.vk4adc.com
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If you have a comment or question, post it as it may trigger or answer the query in someone else's mind.
http://www.vk4adc.com
This Forum is only going to be as interesting as the posts it contains.
If you have a comment or question, post it as it may trigger or answer the query in someone else's mind.