Re: Power for continuous digimode
With standard gain settings I would not suggest it stock on FT8 which is a 50% run time. With a small fan blowing over the stock heatsinks the output transistors get hot on FT8 after 8 cycles I have
By
_Dave_ AD0B
·
#62220
·
|
Re: Totally Absurd -- Farhan being questioned in a police station about doctored sat picture
Happens in every country. However if you feel hurt and you are convinced they did not act properly you may have the possibility to report this to other departments so they may see to investigate
By
iz oos
·
#62219
·
|
Re: Spectrum purity of uBITX and BIT40
Warren discussed this in detail. TX IMD are quite bad, however it does not sound bad at all. Keep in mind it splatters if you shout into the mike. I will try the VOGAD add on, at least it should
By
iz oos
·
#62218
·
|
Re: Totally Absurd -- Farhan being questioned in a police station about doctored sat picture
Sometimes the police can be a bunch of ignorant buttwipes. One sheriffs deputy tried to claim that we HAD to give a refund, when we had a sign that clearly stated no refunds. he did not really know
By
Wayne Leake
·
#62217
·
|
Re: Spectrum purity of uBITX and BIT40
I notice that nobody mentions the best way to check an SSB outgoing signal. You need a good two tone audio signal generator. Along with a wide band scope, check that you see a good sine wave pattern.
By
Wayne Leake
·
#62216
·
|
Re: uBITX - Limiting power output
Nice to point out that existing pot. I suggest leaving it there, lift one leg and try a second pot in series on front or rear panel to trim the output power. Just he careful to route coax around the
By
Curt
·
#62215
·
|
Re: 7277 Bitx >Bitx Today 12/2/18
I have had that same issue and would recommend 7180. Evan AC9TU
By
Evan Hand
·
#62214
·
|
Re: uBITX - Limiting power output
You could add relays and pots to adjust power across bands.? I'm thinking about using the current system for 'max out' and a second layer for 'max 5W out' when feeding my WA2EBY.
By
AndyH
·
#62213
·
|
Re: uBITX - Limiting power output
Thanks for the feedback from all of you. Allison, I wonder if that pot could be brought out to the front panel using some silver/teflon coax for the round trip without creating too many isues? Or is
By
Charles French
·
#62212
·
|
Re: 7277 Bitx >Bitx Today 12/2/18
There is a strong broadcast signal on 7275 which is putting a fairly strong carrier on 7277.? Not good for weak signal work.?? Seems to me the calling frequency should be moved to someplace below
By
Jim Keller
·
#62211
·
|
Re: UbitX audio hiss but no rx
I had the same problem. (Well, at least I thought I did, turns out it was a PICNIC error). Put the radio in CW mode, and find an AM station. Hope that helps. Dave - AI6K
By
David Berkompas <david.berkompas@...>
·
#62210
·
|
Re: Spectrum purity of uBITX and BIT40
Hi Simon, I don't think this is true.? What is true with homebrew, is that the device doesn't not have to be tested by the FCC; the spectral requirements are still the same, but it is up the the user
By
Mark McNabb <n7eku@...>
·
#62209
·
|
Re: Spectrum purity of uBITX and BIT40
Seem to hear that self build, home brew is more relax under fcc laws than mass production factroy machine, to allow progress in test, training, education, etc., in principle. Still want to emit a as
By
Simon
·
#62208
·
|
Re: Spectrum purity of uBITX and BIT40
If i buy a new one, is the good relay come with present version? Or it is consider a user mod, that i need to buy my own good relay 73 Simon
By
Simon
·
#62207
·
|
Re: uBitx Function Button ERROR
Rf pickup on adc can be observe by loading an adc read arduino program, on serial monitor. Use handheld 2m tx with ant near the push button and wiring 73 Simon [email protected]> wrote:
By
Simon
·
#62206
·
|
Re: Is push pull hf amp has higher spectral purity
Garbage in, garbage out. MRM
By
MadRadioModder
·
#62205
·
|
Power for continuous digimode
As is kit without mod, How much power output is ubtx and btx40, for 100 percent continuous digimode? Should i use a larger heat sink? Can output higher with higher voltage and bigger heatsink, for 100
By
Simon
·
#62204
·
|
Re: uBitx Function Button ERROR
Connect multiple thick ground wire from pcb , said rf plug, to multiple point of case, for each piece of casing metal plates. Contact between metal plate is not fully reliable, in strict sense. 73
By
Simon
·
#62203
·
|
Re: uBITX - Limiting power output
Charles French, just back down RV1 on the bitx.? or better yet start at 0 (FYI its counter-clockwise to max not min as its backward) and run it up till the 1208 gives full power using CW.? Since the
By
ajparent1/kb1gmx
·
#62202
·
|
Re: Is push pull hf amp has higher spectral purity
So, for current version that if i buy today, is it basically true that the overall story is 1. btx40 is just meeting fcc spec, i believe is 50dBc for lower freq, 2. Ubtx is just a bit short, but not
By
Simon
·
#62201
·
|