开云体育

Hooray!? ? I have finally managed to get both of my V2-versions upgraded with IRF520 mosfets, TVS protection diodes, a separate audio output to external sound card, resistor to drop the mic bias voltage, some protection resistors in various places to ward off my boo-boo's, aluminum nitride insulators, --?

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I'm more and more impressed with the 64-bit code, now that I'm trying it out.? ?LOTS of great features.? ?I really like the wide-screen LSB/USB display.? The Menu-items are great.? ??

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My biggest issue is that my #141 V2 has a lot of ripple in the 40MHz crystal filter (which the #271 does NOT, huh?)? ?and so I have to have a bit of shaping in the FFT transmit response.? ?I noted that JJ had put in a placeholder for that, but my solution was a piecewise linear correction in two segments.? ?Finally, I got my older code next to his newer sbitx.c and put my stuff in and recompiled.? ?As usually, I made a few screwups like accidentally lopping off a zero from the end of the BFO frequency in the hw_settings.ini file (which made the receiver DEAF!!) -- but hooray, it works now on BOTH V2 machines, and just made an FT8 contact on 20 meters using the ancient linear and my sad EFHW antenna at the family retreat home in North Caroline to prove out everything.? SUCCESS!!!? ? Most of the rest of my personal coding was for high school student experiments, so not necessary.? With the #271 I have been checking in most mornings to the Florida Phone Traffic Net at sunrise on 80meters, getting 200W out of the linear and they could HEAR me 500 miles away on 75 meters.? ?Many of them are running a kilowatt....

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Really nice radio!!!? ? One will stay here in the ancient retreat home in Black Mountain, and the #271 goes with me back to Florida.? ? These work SO WELL now that I think I may encourage others in the group to snap up V2's as they become available and we'll retrofit some of these upgrades for very useful emcomm portable radios.? ? While I was here, I use the -25dB high output electret cartridges to make 2 more sbitx microphones.? ? And also built 4 more "polarity protectors" using my remaining stock of 5 milli-ohm P-channel mosfets.? ?

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With all the CW improvements, and JJ's improvements -- this is really a fun radio!

Gordon KX4Z

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I don't know exactly WHY this works, but I found that the icomemulator software that I wrote and compiled in the 32-bit world, is running just FINE on the 64-bit operating system image that I got from JJ.? ?

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Amazing!

I was able to use WINLINK to control the frequency of the sBitx (however it doesn't set the BAND properly in the current code, so I did that manually) and it worked perfectly to make CAT control of the radio and make a Winlink connection -- just the way it used to on the 32-bit architecture.

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Icomemulator: ?/g/BITX20/wiki/36021

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Uart-to-uart cable between sBitx raspberry and a windows pc: ?/g/BITX20/wiki/36015

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That made less work for me!

Gordon KX4Z

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