I found the comments about versions "1.4" vs. "1.5"
interesting. Initially those version numbers threw me
for bit of a loop, but I believe they are actually
1.140 and 1.150 respectively as diplayed in the Help
About box of either Ten Tec's or Carl's software.
Since I don't have a Jupiter please confirm if that's
true or not, perhaps the Jupiter displays them
differently.
Regardless what I found tonight after loading all the
DSP versions I have here (1.139, 1.140, 1.150, 1.160,
and 1.170) is that there is indeed a distinct
difference between 1.140 and 1.150, the tones are
somewhat less in 1.140 than 1.150 and later, the
relative level difference of the tones is about 10 -
15 dB as measured by using Argo (Beta 1 build 128)
software. I used the exact same control program
(Carl's V1.52) for all of these tests, this was mainly
to assure a consistent line out setting between DSP
firmware loads.
I also checked to see exactly what effect the RF gain
control has on the tones and found that the tones
remain at essentially the same level regardless of the
RF gain setting. I also fiddled a bit with the IF gain
pot and saw similar behavior, these two discoveries
further convince me that the problem is in the DSP
code itself. I've also noted that most any decent
signal will make the tones diminish or nearly
disappear, I would guess it is the AGC action that is
playing a roll in that particular behavior.
Duane
N9DG
--- Dan.Newby@cti-pet.com wrote:
>
>
>
> I found those tones, or birdies ( if what you guys
> are talking about is the
> same thing I hear), on my Jupiter when I first
> loaded ver. 1.5 of Ten Tec's
> software. What I noticed is if I reloaded version
> 1.4 they were gone. What
> I hear is a tone every 2.5 khz as you spin the dial.
> I hear them on bands
> that are very quite like 10 meters, or when I hook
> up the dummy load. Some
> times even 20 meters gets quite enough to hear them,
> but not very often.
> Normal atmospheric noises cover them up, especially
> below 20 meters.
>
> I took mine to Ten Tec and showed them what I was
> talking about and how
> reloading ver. 1.4 would make them go away. They
> acknowledged they where
> there but made measurements and said the birdies
> where below the noise
> floor and within spec and I believe them. Just kind
> of annoying on 10
> meters.
> I enitialy thought I would just run with ver. 1.4
> software, but later
> decided the added features of the noise blanker and
> speech processor out
> weighed the birdie issue.
>
> I must say though, that over all I am extremely
> pleased with the Jupiter.
> In my case, there isn't another rig out right now
> that I would rather have,
> even at 3 times the price. The versatility of the
> Jupiter is fantastic.
>
> I wonder if they are addressing this in the newer
> software they must be
> working on that incorporates the LDG auto tuner in
> the Jupiter?
>
> Dan
> WD4LUR
>
>
>
>
>
>
>
> Duane Grotophorst
>
>
> <n9dg@yahoo.com> To:
> Mark Erbaugh <mark@microenh.com>,
> tentec@contesting.com
> Sent by: cc:
>
>
> tentec-admin@cont Subject:
> Re: [TenTec] Tone(s) on Pegasus receive
>
> esting.com
>
>
>
>
>
>
>
>
> 01/05/2002 07:20
>
>
> PM
>
>
>
>
>
>
>
>
>
>
>
>
>
> Yes these tones are present, I see (and hear) them
> in
> both of my Peg's, no discernable different between
> the
> two radios. I'm told that they exist in Jupiter's
> too.
> Interestingly though I have never found them in the
> RX-320, at least any that are above the noise floor.
> I
> have also been wondering about the RX-340 and the
> RX-350, is there anyone with one or both of those
> radios who wants to check it out and then comment? I
> am also curious about the 526? All you need to see
> those tones is one of the audio processing programs,
> actually most PSK31 programs would likely do. Just
> fire up the program with the antenna connected to a
> dummy load (or simply just disconnected), then look
> for the really narrow faint lines to scroll down the
> waterfall.
>
> What you will also find about those tones is that
> there is always one right smack in the middle of
> whatever filter you have selected. Then there is a
> second tone that will step across the filter pass
> band
> as you tune in frequency steps that match the tuning
> step size you are using. My relative measurements
> here
> have put them at 10 ? 20 dB above the noise floor of
> the RX pass band. This is a real shame for an RX
> that
> is otherwise really quiet and has minimal filter
> pass
> band ripple. But I also have to believe though that
> the problem would correctable if it is given the
> attention it is due.
>
> "If I tune to a 2.5 kHz multiple and the tone is
> present, then tune 1 Hz away to get the beating
> tones
> and then tune back to the 2.5 kHz when the beat
> tones
> are at a null period, I can end up with the tone
> greatly reduced or eliminated."
> Interesting, I had never tried this before today, I
> was able to reduce the tone in the middle of filter
> pass band by 5dB or so. I also think your
> observations
> about the 2.5 KHz is correct, these tones I suspect
> are an artifact of the somewhat peculiar tuning
> scheme
> used in the Pegasus. The only operational wart that
> I
> can really attribute to the tuning scheme is these
> tones.
>
> "Has anyone else noticed this or is this problem
> unique to my Pegasus, indicating that something is
> out
> of alignment?"
> I doubt if it is out of alignment. It is also
> strictly
> in the firmware, the control program has no bearing
> at
> all on it. It is one of the first things I look at
> whenever a new firmware version comes out.
>
> "Or is this just a case of me being too critical in
> my
> analysis?"
> I would say not, this issue is really no less
> important than smooth QSK operation is for example.
> For most day to day SSB, CW, and PSK31 (or SSTV?)
> work
> they will not too likely be noticeable, however what
> I'm finding with WSJT meteor scatter software is
> that
> they are proving to be troublesome. WSJT will
> frequently interpet one of those tones as being one
> of
> its 4 tones that it is looking for in the meteor
> pings. I have not yet tried working with JT43 (a
> PUA43
> variant) but I am afraid that those tones will make
> the Pegasus unusable, JT43 is designed to work with
> signals ~20dB BELOW the noise, needless to say a
> spurs
> 40dB higher will be a problem. And as Larry, VA3LK
> has
> pointed out in his response this problem is not
> totally unique to the Pegasus/Jupiter, I found tones
> and other obnoxious stuff in some the other radios I
> have here, and many of those rigs have significant
> pass band ripple as well.
>
> 73,
> Duane
> N9DG
>
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