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Date
Re: Can we start using SUBGROUPS? uBiTX, biTX40, QRPKITS, Original BiTX20, Homebrew, Other?
Amen! Roy WA0YMH wrote:
By Roy Appleton · #58034 ·
Re: Can we start using SUBGROUPS? uBiTX, biTX40, QRPKITS, Original BiTX20, Homebrew, Other?
-- If there were only a couple messages a day it might make sense to keep everything together.? But I have received over 3000 digests, and it has become nearly impossible to determine which flavor
By DuWayne Schmidlkofer · #58033 ·
Re: uBitx Unfiltered
Alison i have put my uBitx on the shelf and plan no further work on it. Just too many issues trying to make a Ford out of a tricycle. I put these up as an assist for those still trying.? WA8TOD
By Warren Allgyer <allgyer@...> · #58032 ·
Re: uBitx Unfiltered
Warren, That is indeed a mess. One place to look is pull power to the amp.? Look at the output of the 9 element 30mhz filter peak level should be under -10dbm.? ?The stuff you will see there is not
By ajparent1/kb1gmx · #58031 ·
Re: Is this IMD?
Distortion is the likely animal.? If its more than 40db down that is not bad and not to worry about it. To see IMD you need two equal tones inside the filter pass band with non harmonic relationship.
By ajparent1/kb1gmx · #58030 ·
Re: ubitx consensus for 2n3904 smt replacement
There are other versions of 2n2222 in SMT, DXT2222. The MMBTh10 is better than the 3904 as is the SMT 2n2369 (mmbt2369) and BFR106. As to voltage that spot (Q90)should not see more than maybe 16V
By ajparent1/kb1gmx · #58029 ·
Re: Wow... 15 volts in and a bunch out..
Mag loops...? Mis named.? ?Resonant small loop. They run about -12db on 40M for a soso one and maybe -10db for a good one compared to a dipole at 40ft or more.? This is for a 1M diameter loop at
By ajparent1/kb1gmx · #58028 ·
Re: #ubitx. Great EFHW group on Facebook
Ajay, The map below shows most of my QSO's with a Myantennas EFHW-8010P fed with 50' RG8X direct from my ?BITX. ? -- www.bitxmap.com ( http://www.bitxmap.com )
By Doug W · #58027 ·
Re: Can we start using SUBGROUPS? uBiTX, biTX40, QRPKITS, Original BiTX20, Homebrew, Other?
IF we don't take advantage of groups.Io for other topic centric groups we end up with mush. Why do that?? Because people interested in antennas and not bitx interest will likely not look here. Might
By ajparent1/kb1gmx · #58026 ·
Re: #ubitx. Great EFHW group on Facebook
Ajay, Just one clarification: You may use a 49:1 transformer or you may use a tuner. You do not need both. Have fun! WA8TOD
By Warren Allgyer <allgyer@...> · #58025 ·
Re: Can we start using SUBGROUPS? uBiTX, biTX40, QRPKITS, Original BiTX20, Homebrew, Other?
There is already a homebrew group and an antennas group. Splitting the radios up would just make a mess of things. Vince - K8ZW. -- Michigan VHF Corp. http://www.nobucks.net/ http://www.CDupe.com/
By Vince Vielhaber <vev@...> · #58024 ·
Re: Right-sided relay harmonic attempted fix for v3/4 ubitx
Breakout boards http://tinyurl.com/yaf8wcdh http://tinyurl.com/y988tcx9 http://tinyurl.com/y7rqndjo http://tinyurl.com/y7be88cf _._
By Arv Evans · #58023 ·
Re: Wow... 15 volts in and a bunch out..
Cheers!
By Gordon Gibby <ggibby@...> · #58022 ·
Re: #ubitx. Great EFHW group on Facebook
What we really need is an antennas group. Oh, wait... Vince.
By Vince Vielhaber <vev@...> · #58021 ·
Re: #ubitx. Great EFHW group on Facebook
Thanks a lot Warren, This sums it all. A EFHW antenna with 49:1 transformer, without radials with a tuner is a simple solution which seems to be workable solution. Encouraged with this enlightenment
By Ajay Kashikar <ajaykashikar@...> · #58020 ·
ubitx consensus for 2n3904 smt replacement
Hi All, What is the consensus for a SMT replacement for the 2n3904? I note the MMBT10 only has Vceo of 25 vs 40 for the 2n3n04. I really do not want to tack leaded parts onto the board. My latest
By Rod Davis <km6sn@...> · #58019 ·
Re: Harmonics measured by Warren. How bad?
ps ofcom reduces qrm by limiting power to 400 watts for a full licence. intermediate are limited to 50 watts and foundation to 10 watts.. i thinkt that is the big linear amps which cause qrm terry
By terry hughes · #58018 ·
Re: Harmonics measured by Warren. How bad?
i agree that this approach is not ideal but without lab test equipment it is the best available and is within the requirements of the uk ofcom. 73 de terry gm4dso
By terry hughes · #58017 ·
uBitx Unfiltered
I made the attached files for my own reference during work on my uBitx which I have now suspended. But I thought they might be helpful for those still engaged in trying to filter the radio with
By Warren Allgyer <allgyer@...> · #58016 ·
Re: Nextion 3.2 for CEC 1.097 #ubitx
Dear John I have already done a image conversionfor for the 3.5" Nextion with *Microsoft Paint* but I do not know how to change the x,y,h,w . If you have the same LCD I can send you the files. Nikos
By SV9CVJ Nikos · #58015 ·