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zBit thoughts


 

I know the zBit hasn't been delivered yet.? From what little firm information we have, it looks as if this radio would make an excellent unit as a tunable IF to work into a transverter for operation on frequencies above 30 Mhz.? I won't be doing this with mine, but it's a thought.? One thing I do want to do when I get mine is to install a couple of PDF files that I have prepared as databases for DX work.? Those of us who work the satellites might want to install GPREDICT.? This is a tracking program, and it is available for Linux.? I don't know if it is available for the Pi, but it is for Intel/AMD CPUs.? These thoughts might also be good for the sBit.

Gerry Sherman

Sent by the Windows 11 Thunderbird


 

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From: Gerald Sherman via groups.io
Sent: Tuesday, March 18, 2025 3:49 AM
Subject: [BITX20] zBit thoughts
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I know the zBit hasn't been delivered yet.? From what little firm
information we have, it looks as if this radio would make an excellent
unit as a tunable IF to work into a transverter for operation on
frequencies above 30 Mhz.? I won't be doing this with mine, but it's a
thought.? One thing I do want to do when I get mine is to install a
couple of PDF files that I have prepared as databases for DX work.?
Those of us who work the satellites might want to install GPREDICT.?
This is a tracking program, and it is available for Linux.? I don't know
if it is available for the Pi, but it is for Intel/AMD CPUs.? These
thoughts might also be good for the sBit.
?
Gerry Sherman
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Sent by the Windows 11 Thunderbird
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Yes, Gerry, I agree.? ?I don't know the particulars of the not-yet-released zBitx, however, presuming it either has a "send relay output" (or equivalent) or one can be added, it should be a fine option for the exciter transceiver for a transverter (as I have recently tested using the sBitx V2 in such a role).
The electrically controlled transmit/receive switching appears to be important for satellite work (though I have no personal experience) because the "vox" type control just doesn't "hold in" with SSB speech (which I verified with one of the Ukranian-sourced transverters).? ?If the send output doesn't exist, it should be easily added as some of us have already done on the sBitx.
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And you are right about gpredict.? Ashhar Farhan suggested this software, apparently using it himself for this purpose.? ?I downloaded it and installed it on an sBitx and it ran well once I used a display with enough pixels to be able to see the entire page (some of the dialog boxes have fixed dimensions and without being able to get to the buttons at the bottom, you couldn't get out of the choices).? ?I also found that the sBitx 32-bit firmware could be listed as a radio interface under "preferences" and perfectly accepted the calls to port 4532 from gpredict operating on the same device.? ?and obeyed the commands to track Doppler shift, without the need for rigctld (the function is provided right within sBitx).? ? This was quite nice!? ?gpredict allows you to enter the local oscillator of a (mixer-type) transverter.? ? Now not having the unit in hand I can't prove that all will fit and work acceptably on the zBitx but if there is space and speed, it should work.? ??
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73
Gordon KX4Z
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