Rod, When in SETUP keep turning the knob clockwise and finally BFO Set will appear.? It always starts at the same default frequency (this should be fixed and display the current frequency setting) but then you can change the BFO.? Record your setting so you can try different values, but listening while adjusting on a SSB station works (sort of).
Dave WI6R
On Tue, Jan 9, 2018 at 1:55 PM, Rod Self <km6sn@...> wrote:
Hi All,
How does one get into setup to set the BFO
frequency? The instructions on the web site appear not to work.
Rod KM6SN
|
The biggest problem to adding an amp to the uBitx is the fact that it's using the IRF510's as the output amplifier, and the output power is not consistent.? I've thought about adding my 50W amplifier to the uBitx, but the issue there is that the amplifier only needs 0.7W drive at 40m, and needs 3W drive at 10m.? The uBitx is putting out 7-10W @ 40m, and under 3W at 10m, so a variable attenuator or something would be needed, or a set of attenuation resistors and switches.
One option might be to reduce the gain (Increase negative feedback) of the output amplifier using R261/R262 which are pretty large at 200 ohms, and increasing the input drive.? I haven't experimented with this yet though, and they'd probably have to be beefier resistors.? All things in due time, my mod PCB project comes first (it's almost done, will hopefully send out a preliminary design email tonight).
On Wed, Jan 10, 2018 at 8:44 AM, Rob N4RMK <N4RMK.tn@...> wrote: I'm a total novice with electronics, so I'm not sure whether I could effectively make this mod.? I'm just thinking that a 50 watt or 100 watt amp would be an awesome addition to the uBitx.
-- Martin Held - AE7EU
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?
|
Re: Implement a uBITX Memory Manager Program
If you are wondering about RTOS, I think RTOS should be monitoring most interrupts as much as possible. However, the questioner is curious about the timeout.?Timeouts will only occur in the original source of uBITX.
Suppose that you press the menu button once and wait for the next button in the while statement.
Let wsjt-x transmit the protocol that reads the frequency once every 500ms, and if there is no response, it displays an error and disconnects.
When the user presses the button to select the menu and wonders whether to move the band or change the CW tone, 500ms flows and wsjt-x displays an error and disconnects.
This is a problem that can be easily solved using an interrupt or an RTOS.?
For this reason I talked about the interrupt and the RTOS.?If you are wondering about RTOS, please feel free to ask.
I will explain in detail what I know.
Ian,
?I've been wondering if RTOS might be an option to handle all the interrupts etc?
73, Michael
KM4OLT
-- Best 73 KD8CEC / Ph.D ian lee kd8cec@...
(my blog)
|
I'm a total novice with electronics, so I'm not sure whether I could effectively make this mod.? I'm just thinking that a 50 watt or 100 watt amp would be an awesome addition to the uBitx.
|
Ron:
You can put any files in Git that you like. There's not a sketch configurator that you can pick and choose modules to include in a sketch. You could code in a bunch of conditional compilation blocks and build a .h file to select these blocks, but boy does that make the code an unreadable mess. I believe I put my Git Cheat Sheet on the Wiki. James
|
Yep pretty much as Neil N0FN has said.
?
On the schem R8,R9 and R10 are a pad for the input (remember to cut the trace at R9 if you install the pad). I am running the bitx40 with a 5w pad installed. I have set my bitx40 for 5W key down CW so max I get is 5W.
I will be using this setup with my Ubitx as soon as I get it and have it running. I plan to set the out at 5W on that as well, it just works better for my setup.
?
It may not be a fit for you but its a viable lower cost option, if memory serves total cost was around 100$ after parts and shipping. I have had a Hardrock-50 and they are great amps and if you are a skilled builder they are top-notch.
From what I read the HFpacker is a updated/upgraded version of the WA2EBY design. I wanted a low cost option that didn't have or need a bunch of add-ons its just a simple cor keyed amp with pretty low current draw even in the 12v range.
73
?David
? N8DAH
?
|
Re: Micro-BITX ... Lost in post ? Possibly
be patient, I have exactly the same, I am waiting, I think it will come soon
Tom, SQ9DJE
|
Re: My ?BITX in its new home
I have not used this method but people use alcohol water mixtures to remove hot glue. But it appears that not all hot glue is the same material. It is not an immediate softening. It does not mix safely with the heat gun technique.
I have used a strip of brass shim stock inside a knob and a slice of aluminum can would not be beyond me.
73 Louis w0it
Mine has shipped. No word yet on delivery. Ordered 12 December.
toggle quoted message
Show quoted text
On Jan 10, 2018, at 3:10 AM, James Lawrie <lawriejk@...> wrote:
Use a heat gun to soften the glue, should come off then.
James Lawrie
On Jan 9, 2018, at 17:35, Keith VE7GDH <ve7gdh@...> wrote:
Jack W8TEE wrote...
However, even the 3mm knob I have seems wobbly...
it may not actually be metric, but a 1/8" knob. Again, I'm still waiting for my uBITXs to show up. The
shaft diameter on the knob I picked up for my BITX40 was
too large even though it was the size specified. I wish
I had thought about heat-shrink back then. I ended up
putting a squirt of hot-melt glue in the knob before
putting it on the volume control shaft. It will be
interesting if I ever have to remove it!
--
73 Keith VE7GDH
|
Re: Audible pickup of outside noises on speaker line?
#ubitx
I had a problem with the wires to?the audio pot on my Bitx - no twisting or braiding got rid of interference, but once I used a shielded audio cable, the receiver started to behave. I live a mile and a half from an AM broadcast antenna, so anything will act as an antenna.?
--
Karl Heinz - K5KHK
|
On Wed, Jan 10, 2018 at 9:39 AM, John McFadden <johnamcf@...> wrote:
|
Sorry for the newbie question, but the WA2EBY kit is for 1W drive, won't that splatter like crazy with 5-10W from a uBitx? Or how would an operator decrease the uBitx output power that low to let the amp work??
John
On Jan 10, 2018 10:24 AM, "N8DAH" < Dherron@...> wrote: Only ones I know of are the Hardrock-50, HFpacker and the WA2EBY. All but the last one are total kits and cost 300+
I just built up a WA2EBY amp and am pretty happy with it so far.
I got the pcb's from
Toroids
Build notes
I would suggest if you choose the WA2EBY option be sure to do a proper parts list as the on from the link in the build notes is a bit outdated.
?
? 73
?? GL
?? David
??? N8DAH
|
Re: Implement a uBITX Memory Manager Program
|
Only ones I know of are the Hardrock-50, HFpacker and the WA2EBY. All but the last one are total kits and cost 300+
I just built up a WA2EBY amp and am pretty happy with it so far.
I got the pcb's from
Toroids
Build notes
I would suggest if you choose the WA2EBY option be sure to do a proper parts list as the on from the link in the build notes is a bit outdated.
?
? 73
?? GL
?? David
??? N8DAH
|
I hope this isn¡¯t too far off-topic to ask here. ?I¡¯ve looked for an amplifier kit similar to the Bitx radio. ?Does anyone here know of such a kit? ?
de N4RMK?
|
Re: Trouble With Alternate Audio Inputs (BITX40 Module)
Do you have something to detect the presence of radio frequency energy?
A general purpose communications receiver would do fine for this. Just tune it to the various places that energy should show up as the heterodyning takes effect, and Leigh a short insulated antenna wire over the appropriate portion of the Bitx40 circuitry and see if there¡¯s energy there.
If you don¡¯t have that, you could make a small high input impedance RF detector with a small signal diode, 2 capacitors and a high-in put impedance voltmeter. Like a five dollar harbor freight digital voltmeter.
Then just follow the signal chain.
Sent from my iPhone
toggle quoted message
Show quoted text
On Jan 10, 2018, at 09:33, Michael Davis <maddmd818@...> wrote:
Well, I am ready to attempt to troubleshoot my Bitx40 mic input circuit. I printed the mic circuit and will attempt to either inject an audio signal along the mic input line into Q12 and then to the trifilar transformer. After that I'm lost. First I'll replace the electret capsule, just in case it is defective. It does have 3.99 vdc at its contacts when PTT is pressed. Feel free to chime in either in forum or to me individually. It was working so well and suddenly no transmit. All transistor voltages measured normal, including the IRF510 in receive and transmit. Thanks
Sent from Mike's iPad WA1MAD
|
Guess I am confused about git!
You make it sound like git is a collection of independent routines
that do functions and you get to select the functions you want to include in your sketch.
I thought git held complete sketches and you would have to "sort" out the code needed for a specific function?
Ron
From: Ashhar Farhan <farhanbox@...>
To: [email protected]
Sent: Tuesday, January 9, 2018 8:50 PM
Subject: Re: [BITX20] Code snipits
neil, the trouble with having different downloads is that if you use one, you will lose the functionality of another! with git, you will be able to pull whatever changes you need into one build. the unfortunate trouble with git is that no one has written a simple one page how-to for hams. perhaps, allard can take a stab at it? - f
|
Re: Trouble With Alternate Audio Inputs (BITX40 Module)
Well, I am ready to attempt to troubleshoot my Bitx40 mic input circuit. I printed the mic circuit and will attempt to either inject an audio signal along the mic input line into Q12 and then to the trifilar transformer. After that I'm lost. First I'll replace the electret capsule, just in case it is defective. It does have 3.99 vdc at its contacts when PTT is pressed. Feel free to chime in either in forum or to me individually. It was working so well and suddenly no transmit. All transistor voltages measured normal, including the IRF510 in receive and transmit. Thanks
Sent from Mike's iPad WA1MAD
|
Re: Implement a uBITX Memory Manager Program
Ian,
?I've been wondering if RTOS might be an option to handle all the interrupts etc?
73, Michael
KM4OLT
|
Micro-BITX ... Lost in post ? Possibly
I had confirmation that my Micro-Bitx was posted on the 12 the December, Tracked to Mumbai airport ?on the 15 the December, Then it seems to have got lost, Various phonecalls to Royal mail with the tracking number has turned up a blank, Its not on there system, A few emails to HF SIG's , And I've been told it won't get lost in the post .....Time is ticking on, Perhaps its wedged behind a seat in a Royal mail van ? .... Who knows ... Ile give it another week in case it does turn up , If not ile have to email HF SIG's again and go from there .... British postal services can be hit SNF miss st the best of times .
|
Re: Audible pickup of outside noises on speaker line?
#ubitx
A metal enclosure should help, but isn't necessary. If everything is properly hooked up and grounded you should be good to go. Many people run their bitx40/ubitx in the plastic case from?Excellway (sold on BangGood).
I second Robert's comment about the volume wires - that's a fiddly bit of circuitry. Basically anything picked up by the "hot" wires on the volume potentiometer will get amplified and some out of your speakers. I'm currently dealing with some broadcast FM signals on this part of the board.?
Many thanks everyone. David.. yes I know I had my hands & face pretty close to the transistors when it started transmitting to.. thankfully the default frequency is within the 40m band, so not the worst thing in the world, but I had no idea it'd do this; not intentional by any means.
I haven't really touched any components per say, but rather noticed when listening with headphones that noise from the real world was leaking in. Indeed my wires are too long & not twisted. I was hoping to get a proper case before doing too much here, but as far as the knob & audio wires it's easy to lengthen if need be. There's definitely no shielding, and the case I purchased is the plastic casing as seen floating around here lately on eBay. Perhaps I could purchase something to lay the inside of the case with a shielding type tape?
On Wed, Jan 10, 2018 at 2:12 PM KD8CGH < rkayakr@...> wrote: I suspect a problem in the wires going to the volume control. If you look at the schematic those wires carry a weak AF signal that then goes to the final AF amplifier. Any electronic noise picked up from the uBitx board, Raduino or outside air will be amplified along with the signal. Try shortening and/or rerouting those wires. From your picture it looks like you have no case shielding, so the mixers and amplifiers may pick up any stray signal floating in the air.
My uBitx had a great clean receiver. I added several extra wires to connect an internal audio filter for CW in the line to the volume control and the noise floor went up significantly - so I know that you can screw it up that way.
If you touch a component the capacitance of your body can affect the circuit. If touching the case or tapping the table produces an effect without a mic plugged in you may have a loose connection. Loose connections, especially loose grounds, are also a great source of noise.
--
David K4DBZ
Unofficial bitx chatroom:?https://discord.gg/CrHvWFc
|
Rob N4RMK
N8DAH
Michael Monteith
Marc Jones