What limits the speed of the Peg/Jup's band scope? When I used the Jupiter's bandscope it was fairly fast but when using it in Peg mode, it is really s l o wwww. Is this the fault of the rig, firmwar
Steve, I experimented with this a lot in developing the software. The limiting factor is the speed of the AGC. If I run the sweep faster, the AGC does not change quickly enough to give any decent res
Thanks Carl. It makes sense. When the Jupiter does it's own scan, it's much faster. 2 questions: Does the agc not affect the Jupe in standalone mode scanning? Could a firmware change take care of thi
I don't know. It sounds like the internal sweep can read signal strength directly. The program can only read S meter level which is really the AGC level and not true signal strength. I would guess th
If you want to see the effects of this AGC speed limitation download Ten Tec's control program and run it on a decently fast PC of 2GHz or so. Set the band to say 40M at night and then bring up the s
Does the bandwidth of the dsp affect the definition of the peaks on the scope? If so, wouldn't you need to do some demodulating? Steve Ellington N4LQ@iglou.com -- Original Message -- From: "Duane - N
Yes I'm sure that's true. If need be the filtering could be rather broad in the interest of maintaining high speed sweeping. I wouldn't say demodulating as much as simply taking the 16 bit A to D val
What about bringing out the IF signal to the computer's sound card and doing the band scope processing on the soundcard. You can bring out the 12khz pre-DSP signal like was done with the DRM mod. You
I asked Gary Barbour at TenTec the same questions a while back. In sweep mode, the Jupiter firmware does bypass the AGC and it would be possible to add that mode (AGC off) as a setting for use with
The 12 khz IF only moves in 2.5 khz steps. There would be no way to be more accurate in the sweep display than 2.5 khz. You would end up with a plot of vertical blocks, each 2.5 khz wide. Having the
I suppose you can use the 2.5 kHz steps as a design point. Have the external sound card program take 2.5 kHZ wide "snap shots" of the 12 KHz IF signal at each 2.5 kHz step. Then just tune the first L
I had a Flex SDR here for a while and it has the most beautifully defined bandscope I've ever seen It makes the ICOM PROs look like trash. It takes the I and Q signals from the "Tayloe" detector, whi
The FlexRadio has an advantage over the Pegasus / Jupiter in that the Tayloe detector produces both an I (in-phase) and Q (quadrature) signal which are fed to the two channels of a stereo sound card.
more of Not necessarily, the software could compensate. I'm envisioning a setup where the software does frequency analysis of the incoming data (i.e. FFT) - similar to what is done in a PSK31 "Water