Search found 14 matches

by W6LVP
Fri Nov 11, 2022 7:58 pm
Forum: piHPSDR
Topic: Panadapter Line Width
Replies: 0
Views: 1999

Panadapter Line Width

I made a very simple modification to the source so that I could run piHPSDR on an RPi connected to a 1024 x 600 display. When the resolution of the display increases, line widths scale down which makes it difficult to see the panadapter signal line. I can fill in the panadapter which helps but I pre...
by W6LVP
Thu Sep 08, 2022 4:00 pm
Forum: Digital ("Virtual") Audio
Topic: Thetis 2.8.11-21+++ VAC advanced controls: results and discussion
Replies: 175
Views: 228277

Re: Thetis 2.8.11-21+++ VAC advanced controls: results and discussion

More progress. If you tick the Auto box above the two graphs in the lower right corner, there is a good depiction of the state of the resampler servo. The amplitude of the variation is a direct indication of the Doppler shift caused by the pointer moving. I haven't yet determined the maximum accepta...
by W6LVP
Thu Sep 08, 2022 2:49 pm
Forum: Digital ("Virtual") Audio
Topic: Thetis 2.8.11-21+++ VAC advanced controls: results and discussion
Replies: 175
Views: 228277

Re: Thetis 2.8.11-21+++ VAC advanced controls: results and discussion

Is there a way to determine when the resamplers are stable and ready to use? I have seen situations with no over or underruns but with the audio output frequency still slewing. Would no over/underruns AND the ring buffers fairly stable near the middle be a good indicator? Does reducing the ring buff...
by W6LVP
Thu Sep 08, 2022 1:22 pm
Forum: Digital ("Virtual") Audio
Topic: Thetis 2.8.11-21+++ VAC advanced controls: results and discussion
Replies: 175
Views: 228277

Re: Thetis 2.8.11-21+++ VAC advanced controls: results and discussion

Thanks. Your last point is interesting. I don't have ASIO hardware so will try the WDM-KS drivers and point A! to it.

My Mini PC is small and probably too lacking in clock stability for this task. However, the little box uses just 5% of its CPU
to run Thetis, VARA, and VarAC.

Larry
by W6LVP
Thu Sep 08, 2022 2:17 am
Forum: Digital ("Virtual") Audio
Topic: Thetis 2.8.11-21+++ VAC advanced controls: results and discussion
Replies: 175
Views: 228277

Re: Thetis 2.8.11-21+++ VAC advanced controls: results and discussion

The second PC above with less desirable results is a newer Mini PC - basically a laptop without the keyboard, display, or battery in a 4 inch square box. The resampler servo needs to mate the PC and radio digital audio sample rates so PC digital audio static and dynamic clock rate are issues. It is ...
by W6LVP
Wed Sep 07, 2022 2:56 am
Forum: Digital ("Virtual") Audio
Topic: Thetis 2.8.11-21+++ VAC advanced controls: results and discussion
Replies: 175
Views: 228277

Re: Thetis 2.8.11-21+++ VAC advanced controls: results and discussion

I have two PCs both relatively quick with Passmark CPU ratings in the 13,000 range. I have tried different buffer sizes between 64 and 256. I have one PC connected to my 7K which is what I had been focused on. I decided to try to apply what I had learned to my ANAN 100 attached to a different and sl...
by W6LVP
Tue Sep 06, 2022 9:30 pm
Forum: Digital ("Virtual") Audio
Topic: Thetis 2.8.11-21+++ VAC advanced controls: results and discussion
Replies: 175
Views: 228277

Re: Thetis 2.8.11-21+++ VAC advanced controls: results and discussion

I know it is not best form to reply ones own post. However, I have made some progress. My setup is my ANAN 7000DLE and Icom IC-7300 both connected to dummy loads for an antenna. Separate instances of VarAC and VARA control the two radios. Transmit power from each radio into its dummy load determines...
by W6LVP
Tue Sep 06, 2022 4:47 pm
Forum: Digital ("Virtual") Audio
Topic: Thetis 2.8.11-21+++ VAC advanced controls: results and discussion
Replies: 175
Views: 228277

Re: Thetis 2.8.11-21+++ VAC advanced controls: results and discussion

As background, I am a retired electronics engineer and have an appreciation for the task at hand, albeit a foggy one. Fifty years ago, I designed a time base corrector that stabilized the analog video stream from a video tape recorder to within broadcast video standards. I am encouraged. The way Win...
by W6LVP
Mon Sep 05, 2022 8:32 pm
Forum: Digital ("Virtual") Audio
Topic: Thetis 2.8.11-21+++ VAC advanced controls: results and discussion
Replies: 175
Views: 228277

Re: Thetis 2.8.11-21+++ VAC advanced controls: results and discussion

I hope this is right place for this post. I have a simple objective. I want to connect Thetis 2.9.0 using VAC to a VARA digital modem. Actually a VARA modem is a consortium of 17 different modems that are dynamically selected to deliver the best throughput possible depending on chosen bandwidth, rec...
by W6LVP
Sun Sep 04, 2022 9:13 pm
Forum: Digital ("Virtual") Audio
Topic: VAC Doppler Shift
Replies: 1
Views: 2550

VAC Doppler Shift

I own two great ANAN radios with the latest P2 firmware that run Thetis V2.9.0. Most all of my operation is digital modes with recent focus on VarAC and its underlying VARA modem. As part of trying to optimize Thetis VAC, I think I have discovered an interesting anomaly. WARNING: What follows may be...
by W6LVP
Sat Sep 03, 2022 6:57 pm
Forum: Apache Labs Radios: Buy/Sell/Trade
Topic: WTB ANAN 100 or 100B
Replies: 0
Views: 2920

WTB ANAN 100 or 100B

Wanted to Buy: ANAN 100 or 100B.

Best contact is via QRZ email.

Larry
W6LVP
by W6LVP
Fri Apr 03, 2020 10:01 pm
Forum: Everything Else: Antennas, Relays, Switches, Power, Grounding, Cooling, etc.
Topic: DC on Input
Replies: 1
Views: 2033

DC on Input

I may have connected 12 volts DC (power for an active receive antenna) to the RX1 input on my 7000DLE. Transmit and RX2 works correctly. RX1 from any hardware antenna port is down at least 30 dB from what it should be.

Larry
W6LVP
by W6LVP
Tue Aug 28, 2018 11:31 pm
Forum: PowerSDR mRX
Topic: Wave Record and Play
Replies: 2
Views: 3639

Re: Wave Record and Play

I know it's not good form to reply to your own post but I figured out the solution to my earlier question. I use two antennas connected to both receivers for diversity. I listen to one antenna on the left and the other on the right. Transmit only uses left audio which was the side I was using for RX2.
by W6LVP
Tue Aug 28, 2018 9:06 pm
Forum: PowerSDR mRX
Topic: Wave Record and Play
Replies: 2
Views: 3639

Wave Record and Play

Sometimes it is nice to be able to record a receive audio snippet and then play it back so another op can hear how they sound. I am new to this radio and software so I am sure the answer to my question is simple. Using the REC and PLAY buttons in the upper left block, I can record audio and the play...

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