¿ªÔÆÌåÓý

Date
Re: uBITX on CW
I've never had my uBitx on phone.? CW only. I do have a microphone but I'd have to look for it!
By ke4d@... · #57899 ·
Re: End Fed antennas w/ uBITX #ubitx
Please disregard my previous post as it was a comment on another thread!
By iz oos · #57898 ·
Re: Harmonics measured by Warren. How bad?
What you ask is a tunable pre selector. Simple schematics may be taken from the receiver preselectors by the MFJ. Take the components such as capacitors able to the voltage required. And see whether
By iz oos · #57896 ·
Re: Fried irf510s replaced but
Thanks Allison, haven't checked the coils yet.? Finally got the rig back on line and operating.? I put in an inline fuse and blew four of them adjusting the bias and rv1.? The VERY best advise I
By jfein2000@... · #57895 ·
Re: End Fed antennas w/ uBITX #ubitx
Hi Chuck, indeed I was thinking with the logic of building wideband transmission line transformers which cannot be easily built with such a high transformation ratio. As far as I understand you would
By iz oos · #57894 ·
Re: uBITX on CW
https://www.youtube.com/watch?v=9vhkpnvjBAE
By SV9CVJ Nikos · #57893 ·
Re: 4000 mile phone qso on 20m
I spent the first 10 years as a ham QRP and worked the world and I was lucky to have a dipole and vertical (vertical worked better). Now 40 years later I'm getting back in and going QRP w/ EFHW.
By Alex KA3BQE <alexandre.polozoff@...> · #57892 ·
Re: Let out the magic smoke...
Be very careful playing on 160m in the uBitX stock configuration. The PA easily puts out over 30watts with the second and 3rd harmonics to join the party as well. You should have a fuse in-line to
By Adrian Waiblinger · #57891 ·
Re: Harmonics measured by Warren. How bad?
The problem with relying on tuners to cut harmonics is it is hit or miss. I have a L network tuner I use. Sometimes, on some frequencies, my antenna is in near prefect tune and the matching box is
By Tom, wb6b · #57890 ·
Re: Harmonics measured by Warren. How bad?
Would something like this on the output help?
By Brent Seres/ VE3CUS · #57889 ·
Re: Harmonics measured by Warren. How bad?
Bill K8UH, I think part of the problem here is many get posting one by one in the Email and from moment to moment they have at best a vague notion of whats going on till it grabs there attention. The
By ajparent1/kb1gmx · #57888 ·
Re: Harmonics measured by Warren. How bad?
John: Unfortunately, my uBitx Raduino died,and i haven't had the time to fix it and test my circuits. I should get to it this week.However the simulations are clear, it will work. The fix though is to
By Howard Fidel · #57887 ·
Re: Let out the magic smoke...
I'll check the finals. I have some spares, just in case. I'd love to be able to control the power out on the uBitX without opening it up and turning a trimmer pot. If it had a control for output
By Gwen Patton · #57886 ·
Re: Let out the magic smoke...
Based on what you have told us.? Beats us. Likely finals. First without a load assure yourself the power supply is ok. The easy test for fried finals is pull the wire that power them (and them only).
By ajparent1/kb1gmx · #57885 ·
Re: End Fed antennas w/ uBITX #ubitx
For a parallel-resonant transformer, we don't want an excessively high permeability; what we want is the core material which will provide the highest Q at the frequency(ies) of interest.? The
By Chuck, N1KGY · #57884 ·
Re: BITX QSO Afternoon/Evening, Sunday, August 26, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.
Denis, Lots of static crashes, and very few signals.?? Dan, W2DLC
By Daniel Conklin <danconklin2@...> · #57883 ·
Re: Let out the magic smoke...
Step 1: Out with the DVM. 73 de ZL2DEX
By Dexter N Muir · #57882 ·
Let out the magic smoke...
I was tuning up on 160m, and the poor thing went dead. Won't power back up, either. Looks like I need to tear it down and find what mischief I did. Finals? Or power supply? Suggestions from the
By Gwen Patton · #57881 ·
Re: uBITX on CW
Chris, what¡¯s your antenna setup like? I am also on 40m CW, but in Ohio. 73 -- Adam Goler, PhD Cell: (425) 985-8700 "Fear is the mind killer."
By Adam Goler · #57880 ·
Re: BITX QSO Afternoon/Evening, Sunday, August 26, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.
Dan, I have been calling CQ on and off from 3:00PM CST and nothing. I am not hearing much on 40M. Will look for you later. Denis, WB8SKP
By Denis <wb8skp@...> · #57879 ·