I was planning on using a DPDT Minature switch to do this. SO that I could change it on the fly if need be by other software. Thanks so much for the reply...
72290
g3vnc
Feb 17, 2013 8:52 pm
... Hmm. It all depends how you define Dynamic Range and Overload Signal Level! The ARRL Handbook 2011 para 12.4.3 discusses different measures of dynamic...
72291
warrenallgyer
Feb 17, 2013 11:26 pm
Hi Nick It all makes perfect sense if I can accept the lack of logic in having readable signals below the noise floor. However the ARRL Handbook says this in...
72292
warrenallgyer
Feb 18, 2013 12:18 am
OK Nick ..... got it! I re-read our post, all the way to the last line this time. - The signal that doubles the noise power output (causes a 1.414 VRMS...
72293
Dennis
denlap99
Feb 18, 2013 2:47 am
John, I am running the Ensemble II Receiver connected to my FT-1000MP Mk V with HDSDR and Omnirig software and it works fine. Connect the SDR antenna input to...
72294
g3vnc
Feb 18, 2013 11:12 am
... I don't understand this statement. Although the MDS and noise are spectrally quite different, if the MDS power and the noise power in the resolution...
72295
warrenallgyer
Feb 18, 2013 4:01 pm
Completely agree.... the RMS value as measured on a voltmeter at the speaker terminals is the same. However, if you look at the two signals superimposed on a...
72296
vbifyz
Feb 18, 2013 4:37 pm
Spaced at exactly 1kHz. Definitely local, maybe even generated inside the soundcard. Does it disappear when the antenna is disconnected? Or when the Softrock...
72297
Chris Wilson
chrismwilsonuk
Feb 18, 2013 5:39 pm
... 18/02/2013 17:35 Yes, it must be local, but what gives exact 1 kHz signals? I have done nothing at all, the Softrock's been powered up all the time since...
72298
vbifyz
Feb 18, 2013 6:53 pm
I still suggest you increase the gain of your soundcard. Even your "clean" spectrum would be much nicer. It looks like you are using "Line In" instead of the...
72299
Alan
alanzfq
Feb 18, 2013 7:04 pm
... Subject: Re: [softrock40] Re: What might be the cause of this HDSDR display please? ... Chris, I think I've seen people say that the USB can cause this....
72300
vbifyz
Feb 18, 2013 7:06 pm
I was intrigued by this: https://en.wikipedia.org/wiki/Long_delayed_echo I have heard the long path echoes and around-the-world signals from nearby stations...
72301
g3vnc
Feb 18, 2013 7:58 pm
Warren I just measured the 2 Tone Dynamic Range of my Softrock Ensemble Rx and Delta 44 sound card. TEST SETUP TenTec Delta 580 VFO set to 5057kHz. Power...
72302
Anthony Casorso
mux_folder2001
Feb 18, 2013 8:55 pm
I hope that this is not redundant since I have not read all of the posts in this thread. The conventions that have evolved for defining SNR, MDS etc have all...
72303
Milt Cram
w8nue
Feb 18, 2013 9:30 pm
... Hi all, In all of the discussion thus far, I have heard no mention of "power spectral density". In SDR applications, where an FFT is usually used to ...
72304
warrenallgyer
Feb 18, 2013 9:43 pm
Thank you Milt and Tony! A wonderful explanation of the phenomenon I have been observing. My follow-on question would be: Could we incorporate the spectral...
72305
Jerry Haigwood
w5jhjerry
Feb 18, 2013 10:11 pm
Hi All, I am trying to install the USB driver for my XP machine. I downloaded the driver from here: http://pe0fko.nl/SR-V9-Si570/index.shtml#install And...
72306
John Williams
jswillms
Feb 18, 2013 10:24 pm
Backup one directory to where the pe0fko.inf file is located. John - ke5ssh ... -- John Williams KE5SSH - ham since 2007 WQKA523 - GMRS for family use on the...
72307
warrenallgyer
Feb 18, 2013 10:28 pm
Chris I am guessing you are suffering overload from a very strong local signal that is in the filter bandpass of the receiver. I see a very similar display on...
72308
warrenallgyer
Feb 18, 2013 10:39 pm
Chris One additional thought that came shortly after hitting "SEND".... If it is overload, and if you have a scope, you can probe the crossover jumpers on the...
72309
Jerry Haigwood
w5jhjerry
Feb 18, 2013 10:40 pm
Yep, just figured that out a few minutes ago. The Si570 is working fine! Thanks. Jerry W5JH "building something without experimenting is just solder practice"...
72310
Chris Wilson
chrismwilsonuk
Feb 18, 2013 10:42 pm
... 18/02/2013 22:36 I need to do some more testing. I got a similar signal on 10 meters this afternoon. Disconnecting the antenna at the Softrock antenna ...
72311
Milt Cram
w8nue
Feb 18, 2013 10:55 pm
... Hi Guys, Re: Minimum Detectable Signal and Minimum Discernable Signal If you haven't already read this--take a look. ...
72312
Jakub Sarna
jakubsarna
Feb 19, 2013 12:47 am
Hello Gentlemen I have a question if someone could help me in this topic Well, I have my desktop radio FT-1000D as well as Softrock I use, and I would like at...
72313
Jerry Dunmire
jedunmire
Feb 19, 2013 12:52 am
Hi Jakub, I have a similar setup and here is what is working for me: http://rockingdlabs.dunmire.org/projects/antenna-isolator 73, ...jerry KA6HLD...
72314
edingraham
Feb 19, 2013 12:58 am
When operating at Full Speed, USB sends a Start Of Frame each millisecond. With light buss traffic (and poor USB shielding) this might be visible. Try a new...
72315
Jakub Sarna
jakubsarna
Feb 19, 2013 1:20 am
Hi Jerry thanks for the info, this with you using a TS-440 and PTT took control of the REMOTE jack, I have a FT-1000D and in me there is no such slot ...I'm...
72316
Alex
malard...
Feb 19, 2013 2:35 am
I also figured out that using a poor audio cable [from rxtx to soundcard] for the input from the rxtx to soundcard will cause a problem. I replaced both tx and...
72317
Alan
alanzfq
Feb 19, 2013 8:25 am
... Subject: [softrock40] Re: Softrock Dynamic Range and MDS Redux Nick, Is this using 16 or 24 bits? Your figure relates closely to what has been said to be a...
72318
warrenallgyer
Feb 19, 2013 8:41 am
You guys have cleared up a couple of mysteries for me. The "RBW" control on HDSDR controls the resolution bandwidth which, I believe, equates to the FFT bin...
