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by Mike2459
Tue Apr 30, 2019 12:45 am
Forum: SDRuno
Topic: Errors when queuing output buffers
Replies: 3
Views: 1107

Re: Errors when queuing output buffers

I got this same error yesterday. It happened when I switched users on my PC. I never logged out of the account that had SDRUno running. I simply switched users to the Admin account. When I logged off the Admin account and returned to the account that was running SDRUno I got this error. It's impossi...
by Mike2459
Mon Apr 29, 2019 11:20 pm
Forum: SDR Antennas
Topic: PA0RDT Antenna
Replies: 11
Views: 3235

Re: PA0RDT Antenna

I saw a significant increase in signals and a reduction in noise when the coax shield was connected to a good earth ground and an RF isolation transformer was installed. I believe the current version has the isolation transformer already installed.
by Mike2459
Mon Apr 29, 2019 10:39 pm
Forum: SDRuno
Topic: RSP2 AND SDRuno V1.3/1.31
Replies: 5
Views: 1183

Re: RSP2 AND SDRuno V1.3/1.31

No, it works on both versions. This is the primary reason I don't use 1.31: viewtopic.php?f=11&t=4369
by Mike2459
Mon Apr 29, 2019 4:49 pm
Forum: SDRuno
Topic: RSP2 AND SDRuno V1.3/1.31
Replies: 5
Views: 1183

Re: RSP2 AND SDRuno V1.3/1.31

Yes, everyday. Version 1.3 but NOT 1.31
by Mike2459
Mon Apr 29, 2019 3:45 am
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 78
Views: 6146

Re: Receive Antenna & Impedance "Matching"

SDROM, You never cease to amaze me. Increasing gain or adding attenuation does one of two things only: It either increases signal AND noise in the case of gain and reduces signal AND noise in the case of attenuation. There is a big advantage to maintaining a low noise floor but adding attenuation is...
by Mike2459
Sun Apr 28, 2019 11:32 pm
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 78
Views: 6146

Re: Receive Antenna & Impedance "Matching"

IF YOU CAN HEAR A DIFFERENCE IN THE NOISE LEVEL OF YOUR RECEIVER BETWEEN AN ANTENNA BEING CONNECTED AND ONE NOT BEING CONNECTED, YOU HAVE ALL THE RECEIVER GAIN YOU CAN USE! Let me add to what the author of the above is saying in my own words. "OPTIMIZE THE SIGNAL TO NOISE RATIO NOT THE RECEIVE...
by Mike2459
Sat Apr 27, 2019 9:52 pm
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 78
Views: 6146

Re: Receive Antenna & Impedance "Matching"

The first two Antscope screenshots you posted at the link show Z deviating from 50Ω by 42% @5.475 Mhz and 40% @5.650 Mhz. In my world a 42% deviation is significant.

Cheers
by Mike2459
Fri Apr 26, 2019 9:36 pm
Forum: Spectrum Analysis
Topic: Virtual Trackgen
Replies: 30
Views: 10467

Re: Virtual Trackgen

Uploading hex files with XLoader.exe is much much simpler than using the command line tool.
by Mike2459
Fri Apr 26, 2019 10:18 am
Forum: Spectrum Analysis
Topic: AD9850-ARDUINO Interconnect
Replies: 16
Views: 2908

Re: AD9850-ARDUINO Interconnect

Steve posting this for your information, hope it can help.: Also tried uploading the trackgen Arduino hexfile to a Mega 2560R3, same result - which I expected!! I did note that the 2560's Rx LED flashed as if it was receiving data when I clicked on the Arduino COM ports number in trackgen, the blink...
by Mike2459
Tue Apr 23, 2019 9:13 pm
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 78
Views: 6146

Receive Antenna & Impedance "Matching"

Reprinted from Discussion in 'Ham Radio Discussions' started by KL7AJ, Nov 30, 2009. https://forums.qrz.com/index.php?threads/the-importance-not-of-matching-receiver-impedance.227442/ Technical topics on QRZ seem to cycle through periodically. The topic of the week seems to be impedance matching of ...

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