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Date
Re: ubitx v4 spurs fix confusion #ubitx-help #ubitx
Ah that explains why my radio didn't like 680uH I think that was value I saw posted. Can confirm that 680 uH really attenuates the signal.
By _Dave_ AD0B · #64367 ·
Re: ubitx 40 for sale...
I would be tickled to play with it, Bob!? A survivalist/Prepper Group I am a member of is searching for an entry-level rig for Solar/Battery useage.? They have been pretty quick to get their Amateur
By Guy Skeer · #64366 ·
internal view of cabinet
Sorry I missed sending this internal picture 73 de Pop VU2POP
By Prathap Naidu <vu2pop@...> · #64364 ·
ubitx Cabinets by VU2POP
Hi All Sharing some piuctures of the ubitx cabinet made by me. This is a common cabinet for both 2 line LCD aswell as the 2.8 TFT display You need to change only the bezel As usual will supply
By Prathap Naidu <vu2pop@...> · #64363 ·
Re: ubitx 40 for sale...
I suspect it"may" be the Raduino that went belly-up. The main board is no doubtOK. Would not want to botheryou with something that is "not worth theprice of a new one even with the extras." It's not
By Bob Lunsford · #64362 ·
Re: Recieve audio
Thanks John, Good find! However I am surprised at your reading at TP21 which should be TX like reading. RX = 12K without power, 5-7K with power depending on probe polarity. TX = 18 Ohms. Raj
By Raj vu2zap · #64359 ·
Re: Recieve audio
Hi Raj.. Found? T21 - 10.66 ohms by my? multi meter.? While probing around with multimeter I found the problem. I had a senior moment and put the positive and negative wires on the wrong way around
By zl4ro@... · #64358 ·
Re: #bitx40help #bitx40 #bitx40help #bitx40
Has anyone / is it possible to use a display like the Nextion?
By Mike Short <ai4ns.mike.spam@...> · #64357 ·
Re: #bitx40help #bitx40 #bitx40help #bitx40
After recompiling with the pin interrupt library in the proper folder all works well. I let the smoke out of two Nanos due to miswired board.? Starting Allard mods now. So far so good.
By Mike Short <ai4ns.mike.spam@...> · #64356 ·
Re: Spurs/Harmonics fixes for v4 based on v5 board design?
Curt, Touching L5 or L1 makes the whole chain unstable and generates a huge amount of spurs. That is why I changed them to shielded SMD version and it improved matters a great deal. Raj
By Raj vu2zap · #64355 ·
Re: Spurs/Harmonics fixes for v4 based on v5 board design?
I managed to assemble the two 330nH and one 47 pF cap on a tiny board, allowing me to install it with minimal effort. Following the v5 schematic I then removed the 47 ohm smt resistor, replacing it
By Curt · #64354 ·
Re: Spurs/Harmonics fixes for v4 based on v5 board design?
Hi, Sewing needles are typically nickel plated, and nickel is only fair for solderability (as is steel too.)? Sometimes they are chrome plated and chrome has very poor solderability. Toothpicks do a
By Mark McNabb <n7eku@...> · #64352 ·
Re: ubitx 40 for sale...
I'll throw you 30 shipped for it. Not working its not worth the price of a new one even with the extras. -- Tim Keller - KE2GKB https://shop.kit-projects.com
By KE2GKB · #64351 ·
Re: Spurs/Harmonics fixes for v4 based on v5 board design?
I think sewing needles are made of stainless, regardless, solder does not seem to stick to them, they are ready ?made and available in a variety of sizes and may even have other uses beyond clearing
By ohwenzelph · #64350 ·
Re: Websdr
Hi, I have played with the WebSDR a bit but no QSOs. I think for casual operation I would be logging the other side of the QSO as the transmitter location. I am hearing the other ham's transmitter and
By Bill Cromwell · #64349 ·
Re: spurs & harmonics, whew!
Allison wrote: Before resorting to that with a cleaned up board I'd try putting just the coils on the? opposing side of the board and take advantage of the ground plane.? Its easy and the vias work
By ohwenzelph · #64348 ·
Re: Websdr
I am afraid it is not a valid QSO. The transmitter and the receiver should be within 500m or so, although you can remotely operate, at least there is this sort of rule in the major contests.
By iz oos · #64347 ·
Re: Ubitx CEC firmware S-Meter
Or get a step attenuator such as "The Attenuator Kit #13" that Kees is selling for $15+$4: ? ?https://www.qsl.net/k5bcq/Kits/Kits.html and drive it from that long forgotten 1W qrp transmitter down
By Jerry Gaffke · #64346 ·
Re: Websdr
Gary - how do you log this QSO? You xmit/receive in Austin, the other side receives in UT but xmits in Chicago? 73 Kevin K5KDT
By Kevin Timm · #64345 ·
Re: Ubitx CEC firmware S-Meter
Brad somewhere on the Norcal QRP website is a little circuit called S9/S1 signal source.? when I did the calculation I get S9 and S4 ... anyway its a one transistor crystal oscillator that makes 2
By Curt · #64344 ·