I'm sorry if this isn't allowed
#forsale
EBAY LISTING FOR B210 ( https://www.ebay.com/itm/314034462509 ) But I have a nice B210 SDR with accessories for sale on ebay if anyone is interested!
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ETAPRIME
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#93474
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Re: uBitX problem
Don, you are spot on! The guys providing common sense support are excellent. And I can¡¯t say enough about the time and effort that Evan puts in. It has to be a true labor of love! Thanks to all!
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Allen Hill
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#93473
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Re: uBitX problem
Evan + Others ¡ª your help desk like support enables MANY of us to accomplish what, on our own, we could never do. Evan¡¯s observations ¡®bout where to find help on a specific topic/issue are spot
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Don - KM4UDX
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#93472
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Re: AGC
#v4
Now that I think about it I have many rigs without apparent agc. The list is huge. A prime reason for agc is to reduce need to adjust the volume control. For many classic cw qrp rigs, for example
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Curt
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#93471
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Re: AGC
#v4
Dave, Thanks for the report. Didnt know if the mod on the mic amp helped at all.I changed r126 to 4.7 k and r123 to 10 ohms. might put it back to original and add an rf amplifier to it. maybe 25 to 40
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david todd
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#93470
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Re: uBitX problem
I should add that the information posted gets lost on the Groups.io site.? Even when put in the "files" or WiKi sections, no one seems to be able to locate the information.? Most of my replies are
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Evan Hand
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#93469
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Re: uBitX problem
I use a Siglent SDS 1102CML+ 100MHz scope. I have posted some of the other test points in prior emails.? The ones recently are for testing the transmitter.? I have not looked at the IF stages but
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Evan Hand
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#93468
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Re: uBitX problem
I could sure use it also.
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Bill Robbins <wa8cdu@...>
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#93467
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Re: uBitX problem
Evan, I forgot, specify the bandwidth and model of your oscilloscope, the measurements can be different depending of our oscillo. Thank's
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Gerard
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#93466
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Re: uBitX problem
Evan, You¡¯ve done a fantastic job with these oscilloscope screen copies. But would it be even more interesting to actually have a scope screen of all the test points?? (20 i think) It¡¯s a little
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Gerard
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#93465
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Re: uBitX problem
Vic, Your power supply is also low,please check voltage. You should get more voltage on the collector.
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Raj vu2zap
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#93464
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Re: AGC
#v4
David I heard you check in to midcars from Mo. -- 73 Dave ADOB ( https://www.qrz.com/db/AD0B ) Raduino bracket and Ham_Made_Keys ( http://veloliner.com/ham/k0mbtkey.pdf )
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_Dave_ AD0B
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#93463
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Re: uBitX problem
Vic, As promised, here are the scope captures of the test points TP2 through 7. Hope this helps. 73 Evan AC9TU
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Evan Hand
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#93462
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Re: AGC
#v4
Im looking forward to the sbix also. Ashhar always has a good product. agc for the bitx40,i havent installed yet on a unit i recently purchased off QTH.Ive installed the the harmonic fix, usb mod,and
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david todd
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#93461
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Re: uBitX problem
I've got a v3, but I believe all versions are just 2 layer boards. Adding internal layers would be a considerable jump in price. Could well be that the issue is around T9, and the discoloration you
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Jerry Gaffke
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#93460
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Re: uBitX problem
Vic, I am 99% sure it is only two layers for the board. I will look at my v4 again to see what I get for voltages using my oscilloscope 73 Evan AC9TU
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Evan Hand
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#93459
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Re: uBitX problem
More probing...voltage checks on transistors Q92-3, Q95-7, Q911-912 all read C:10.0, B:0.9, E:0.2 today RF probe checks: TP2: 103 TP3: 231 TP4: 5? <== so this is the oddball TP5:152 TP6:142 TP7:445
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Vic WA4THR
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#93458
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Re: Some capture from sbitx
I would recommend keeping the sBitx discussion here until the extra traffic is a problem, if that is ever the case. Those who are somewhat interested can keep up with news on how it's going. And the
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Jerry Gaffke
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#93457
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Re: AGC
#v4
I think ND6T's design has the most promise as it's designed for the BITX platform. The only seller I could found has stated they are on their " last batch (
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W1BTR
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#93456
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Re: Some capture from sbitx
Ashhar Farhan, I am interested in purchasing one of the hacker units.? Can you say what the price will be? Another Groups.io list for the sBitx would be a good idea until it is mainstream on the
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Evan Hand
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#93455
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