Search found 89 matches

by AB2EZ
Sun Jul 22, 2018 10:18 pm
Forum: PowerSDR mRX
Topic: Panadapter level reading when using "tune"
Replies: 3
Views: 145

Re: Panadapter level reading when using "tune"

Based on the behavior that I am observing... I suspect that the step attenuator's actual value (independent of the S-ATT setting shown on the GUI) is being set to 31dB when you first select tune mode. Then, when you change the S-ATT setting (while still in tune mode), the step attenuator 's actual v...
by AB2EZ
Sun Jul 22, 2018 7:08 pm
Forum: PowerSDR mRX
Topic: Panadapter level reading when using "tune"
Replies: 3
Views: 145

Re: Panadapter level reading when using "tune"

Walter Thanks... that works! While in "tune" mode... I changed the S-ATT setting from 19dB to 20dB... and the panadapter reading changed from about 10dB too low to the correct reading. Yes... if I cycle tune off and back on... then the panadapter reading returns to about 10dB too low. Inte...
by AB2EZ
Sat Jul 21, 2018 7:43 pm
Forum: PowerSDR mRX
Topic: Panadapter level reading when using "tune"
Replies: 3
Views: 145

Panadapter level reading when using "tune"

Just a reminder of a problem that first came up several HPSDR releases ago... and still remains in release 3.4.9. I am using an ANAN-10E, but I believe this problem exists on other models as well. In "tune mode" (but not in other modes such as two tone, or normal transmit operation), with ...
by AB2EZ
Mon May 07, 2018 6:20 pm
Forum: Digital ("Virtual") Audio
Topic: Buffert settings just for fun...
Replies: 6
Views: 414

Re: Buffert settings just for fun...

I am using a pair of VB-Audio virtual cables (https://www.vb-audio.com/Cable/) to connect my ANAN-10E's VAC 1 digital i/o to my WSJT-X application's digital i/o. VAC-1: the selected Driver is MME, the Buffer Size is set to 512, the Sample Rate is set to 48000, the Latency is set to 50 (manual) VB Au...
by AB2EZ
Mon Apr 30, 2018 3:37 pm
Forum: Digital ("Virtual") Audio
Topic: VMB Virtual Cables: cross connect or not?
Replies: 3
Views: 224

Re: VMB Virtual Cables: cross connect or not?

Scott Could it be that the block diagram of VMB is not what you are assuming it to be? I.e. Could it be that each of the two virtual inputs of VMB is the input end of a 1-way (unidirectional) virtual cable... with the other end terminating on an associated digital cross-connect (but not directly con...
by AB2EZ
Sun Apr 29, 2018 4:09 pm
Forum: Digital ("Virtual") Audio
Topic: VMB Virtual Cables: cross connect or not?
Replies: 3
Views: 224

VMB Virtual Cables: cross connect or not?

Scott et al. When I use the VMB virtual cables for VAC1, I have used them as recommended by Scott: E.g. VAC1 output from transceiver => VMB virtual channel input. VMB virtual channel => B2 (aux virtual channel output) . WSJT input => Aux VMB virtual channel output But, everything seems to work fine ...
by AB2EZ
Sun Apr 29, 2018 3:37 pm
Forum: Digital ("Virtual") Audio
Topic: Coherent IQ Streams for Adaptive EME
Replies: 33
Views: 1194

Re: Coherent IQ Streams for Adaptive EME

Conrad
et al.

I am very much enjoying reading and following this discussion.

Thank you
Stu
AB2EZ
by AB2EZ
Thu Apr 26, 2018 2:33 pm
Forum: Hermes 14-bit (10E, 100B)
Topic: 10 or 10E
Replies: 2
Views: 262

Re: 10 or 10E

Chuck

If you turn the 10XXX over you can tell if it is a 10E or not. A 10E has a small slide switch in the center of the bottom cover. The 10 does not.

Stu
by AB2EZ
Sun Apr 01, 2018 7:41 pm
Forum: Digital Mode & Logging Software
Topic: Amplitude modulation on 'constant envelope' modes
Replies: 19
Views: 1177

Re: Amplitude modulation on 'constant envelope' modes

Conrad

Hi!

Any update? E.g power out v. FT8 tune frequency?

Stu
by AB2EZ
Mon Mar 26, 2018 6:45 pm
Forum: Digital Mode & Logging Software
Topic: Amplitude modulation on 'constant envelope' modes
Replies: 19
Views: 1177

Re: Amplitude modulation on 'constant envelope' modes

Conrad If you change the WSJT-X FT8 tune frequency in 500Hz steps... between 500Hz and 2500Hz... what are the corresponding output power readings... relative to the 500Hz reading? Also, have you tried toggling the transmit equalization on and off to see if the transmit equalizer is “stuck” in the ac...
by AB2EZ
Sun Mar 25, 2018 5:40 pm
Forum: Digital Mode & Logging Software
Topic: Amplitude modulation on 'constant envelope' modes
Replies: 19
Views: 1177

Re: Amplitude modulation on 'constant envelope' modes

Conrad Since A) You see no amplude modulation when using WSJT in tune mode ... with a given nominal frequency (e.g. 500 Hz)... but you see a variation in the RF output when you change the nominal frequency. B) You have looked directly at the audio output of your sound card (digital audio interface),...
by AB2EZ
Sat Feb 24, 2018 5:36 pm
Forum: PureSignal Operations
Topic: Accuracy re fidelity on/with the TX display while using PS
Replies: 33
Views: 2266

Re: Accuracy re fidelity on/with the TX display while using PS

Rob Yes... doing this measurement with an auxiliary receiver in the same location as one's transceiver/amplifier is much more complicated than it appeared to be when we first thought about it. Even with the relatively low internal crosstalk levels in the more recent ANAN-XXX products, I remain skept...
by AB2EZ
Tue Feb 20, 2018 7:53 pm
Forum: PureSignal Operations
Topic: Accuracy re fidelity on/with the TX display while using PS
Replies: 33
Views: 2266

Re: Accuracy re fidelity on/with the TX display while using PS

Rob I think your latest posted measurement results are very helpful, but: You wrote "The third-order IMD results were not as good as seen when running the transmitter into the dummy load where the signal strength into the receiver ranged between 20dB to 30dB over S-9. I think I would agree with...
by AB2EZ
Tue Feb 20, 2018 7:32 pm
Forum: PureSignal Operations
Topic: Accuracy re fidelity on/with the TX display while using PS
Replies: 33
Views: 2266

Re: Accuracy re fidelity on/with the TX display while using PS

Gary

You appear to have misunderstood my recent post. Please read it again.

Stu
by AB2EZ
Tue Feb 20, 2018 5:32 am
Forum: PureSignal Operations
Topic: Accuracy re fidelity on/with the TX display while using PS
Replies: 33
Views: 2266

Re: Accuracy re fidelity on/with the TX display while using PS

Rob Scott Thinking about this some more.... The power leaving the transceiver is only around 13dB less than the power leaving the external amplifier. With a dummy load attached to the external amplifier (and with the amplifier input being equivalent to a dummy load at the output of the transceiver)....
by AB2EZ
Mon Feb 19, 2018 9:46 pm
Forum: PureSignal Operations
Topic: Accuracy re fidelity on/with the TX display while using PS
Replies: 33
Views: 2266

Re: Accuracy re fidelity on/with the TX display while using PS

Scott
Rob

Assuming that the software being employed with the RSP1 allows one to increase the averaging time... shouldn't one be able to significantly reduce the effect of phase noise in the panadapter display produced in the 2-tone test by increasing the averaging time to a much larger value?

Stu
by AB2EZ
Mon Feb 19, 2018 6:58 pm
Forum: PureSignal Operations
Topic: Accuracy re fidelity on/with the TX display while using PS
Replies: 33
Views: 2266

Re: Accuracy re fidelity on/with the TX display while using PS

Rob The 2-tone spectrum looks reasonably clean on the RSP1 display... but it is difficult to confirm that the IMD products are more than 40dB below the principal tones. I.e. -53dm - (-93dBm). On the SSB displays... its appears (with some interpretation to ignore the 2nd peak on the RSP1 display) tha...
by AB2EZ
Sun Feb 18, 2018 7:19 pm
Forum: PureSignal Operations
Topic: Accuracy re fidelity on/with the TX display while using PS
Replies: 33
Views: 2266

Re: Accuracy re fidelity on/with the TX display while using PS

Rob I'm thinking of buying an RSP1A from HRO If you are transmitting with your ANAN + external AMP... and also using your RSP1 for monitoring your amplifier's RF output spectrum... How do the 2-tone spectrum readings of IP3 compare (ANAN DUP vs. RSP1) when you have a) Pure Signal turned off b) Pure ...
by AB2EZ
Sat Feb 17, 2018 6:06 pm
Forum: PureSignal Operations
Topic: Accuracy re fidelity on/with the TX display while using PS
Replies: 33
Views: 2266

Re: Accuracy re fidelity on/with the TX display while using PS

One of the things that could cause a disparity between the DUP display and the actual RF output spectrum of the amplifier is non-linearity being introduced by the the coupler. I.e. if the output of the coupler's sampling port is not linearly proportional to the RF output of the amplifier* Therefore,...
by AB2EZ
Thu Feb 15, 2018 5:38 pm
Forum: PowerSDR mRX
Topic: Transmit signal levels on panadapter
Replies: 19
Views: 1325

Re: Panadapter & waterfall settings

Gary

Don't forget to check the SMA jumper cables between the coupler, attenuator(s) and the radio for: connector=>connector center conductor and ground DC connectivity, and no shorts between center conductor and ground.

Stu
by AB2EZ
Wed Feb 14, 2018 12:56 am
Forum: PureSignal Operations
Topic: Panadapter "view" in TX with DUP on - using PS
Replies: 7
Views: 647

Re: Panadapter "view" in TX with DUP on - using PS

Gary It is also possible that the sample of the RF being produced by the Xtronics XDC-4SO coupler is a distorted (non-linear) sample of the RF. There are a number of things that could cause this. For example, the coupler contains ferrite-core transformers. If one of the cores has been damaged by ove...
by AB2EZ
Tue Feb 13, 2018 8:24 pm
Forum: PureSignal Operations
Topic: Panadapter "view" in TX with DUP on - using PS
Replies: 7
Views: 647

Re: Panadapter "view" in TX with DUP on - using PS

Adding to my post (above) ... it is my understanding that some ANAN 8000 owners have reported an assembly error... in which the two internal Pure Signal cables that attach to the Pure Signal in and Pure Signal out connectors on the rear of the transceiver are swapped.

Stu
by AB2EZ
Tue Feb 13, 2018 6:29 pm
Forum: PureSignal Operations
Topic: Panadapter "view" in TX with DUP on - using PS
Replies: 7
Views: 647

Re: Panadapter "view" in TX with DUP on - using PS

Gary When transmitting... with DUP active.... the panadapter displays the spectrum of the total signal arriving at the input to RX1. This consists of the sum of two RF voltages: a(t): The sample of the amplfier's RF output that is being fed into RX1 from the coupler at the output of the amplifier b(...
by AB2EZ
Fri Feb 02, 2018 6:28 pm
Forum: PowerSDR mRX
Topic: Feature interaction between monitor and AM
Replies: 11
Views: 842

Re: Feature interaction between monitor and AM

Scott Good suggestions! I had never used the ALC Comp meter reading... but I have now switched to that... and turned up the microphone gain to obtain about 1dB on peaks. I was curious about the changing output level behavior of the MON functionality (as explained by Warren)... and I am still curious...

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