Re: Bitx20a FREE to a good home
Thanks Joe and Michael,
Ed Kelley
828 Althauser St.
Dubuque, IA 52001
PS send me your PayPal email. Thanks
Ed
On 12/2/2017 5:16 PM, Joe Piacentini
wrote:
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Ok, update:
?Michael has decided to pass, so Ed looks like you¡¯re next in
line. Just let me know where to send it. ?
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Re: Bitx20a FREE to a good home
Ok, update: ?Michael has decided to pass, so Ed looks like you¡¯re next in line. Just let me know where to send it. ?
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Re: Bitx 40 Hardware Questions
First: I take it the empty pads etc have markings? D an VR numbers? If so, they're most likely superseded by? a 'double-diode package. The original diodes were iN4148(equivalent)s and the trimpot was to balance them. The new package is twinned Schottkys (far better low-signal performance), and manufactured on the one lump of silicon and so inherently balanced. The C103 trimmer was provided *for* as an option to adjust for better audio by pulling the BFO's Xtal frequency a little to a better position relative to the edge of the Xtal Filter's slope (they all can vary a little with manufacturing tolerances). Search back in the Group's Message archive for more in-depth explanation, but upshot is, as has been emphasised here often,"It's a work in progress". Note that yours is V3 - there may yet be a V4 - that's up to Farhan VU2ESE, its creator.
This ought to be a 'sticky' on the Group's homepage ... :)
73 de ZL2DEX
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Re: BITX40- New RaduinoXP (Mega) PCBs are in and tested
Have you worked out
pricing for the Lotsa Clock pcb Mike and how did your DX mail
weighing of the 2 pcb offer go?
Bill, VK7MX
On 1/12/2017 9:54 AM, Michael Hagen
wrote:
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The
second order of RaduinoXP PCBs got here Tuesday.
I have built 4 and am really pleased.
There are LOTS of Connectors.
See attached PDFs for pinouts.
Attached are Blurry Photos of bare and completed PCBs, and the
RaduinoX
(Nano) PCBS for size comparison.
Don't look too long, your eyes will cross!
You can email me for more info.
Bare PCBs for XP are $12 (total US) and a special 1 ea. XP and 1
ea. X
for $16.
So you get Both.
I also got "Lotsa Clocks" board tested.? It is stand alone PCB
with the
Big Brother (20 Pin) SI chip.? It has 2? 8 pin outputs for the 8
Clocks
with a ground in between for coax.? Runs on 4 pin I2C connector
from 5
Volts.? Has 3.3V level shift and regulator on board.
73's
Mike, WA6ISP
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Re: Bitx20a FREE to a good home
Boy that was fast ?. Ok Michael, you asked first so I guess you win. Just let me know where to send it.?
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Re: Bitx20a FREE to a good home
If you don¡¯t have somebody already, I¡¯m learning a lot about electronics and I would love to have a 20m kit to play around with. Would be fun to fix too.
Thanks, Ben KD2NOU?
I can PayPal you say 20 to cover shipping
Ed W0IC
On 12/2/2017 2:38 PM, Joe Piacentini
wrote:
Hello,
I built a Hendricks Bitx20A kit a few years ago.? It actually
worked for a bit, had one QSO, but I never got it to work
consistently.? Oscillation in the PA, and now I may have added a
new problem when I accidentally overdrove the mic input.? Several
folks in this group gave me good suggestions, but despite all the
help I keep ending up frustrated.? So, in the hope that this kit
might bring someone pleasure, I offer it free to a good home.? Any
takers?
73 Joe P. AB3LD
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Re: Bitx20a FREE to a good home
I can PayPal you say 20 to cover shipping
Ed W0IC
On 12/2/2017 2:38 PM, Joe Piacentini
wrote:
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Hello,
I built a Hendricks Bitx20A kit a few years ago.? It actually
worked for a bit, had one QSO, but I never got it to work
consistently.? Oscillation in the PA, and now I may have added a
new problem when I accidentally overdrove the mic input.? Several
folks in this group gave me good suggestions, but despite all the
help I keep ending up frustrated.? So, in the hope that this kit
might bring someone pleasure, I offer it free to a good home.? Any
takers?
73 Joe P. AB3LD
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Re: Bitx20a FREE to a good home
I have a Hendricks Bitx17A kit and I would like a 20 to fix
Ed W0OIC
ekelley828 at centurylink.net
On 12/2/2017 2:38 PM, Joe Piacentini
wrote:
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Show quoted text
Hello,
I built a Hendricks Bitx20A kit a few years ago.? It actually
worked for a bit, had one QSO, but I never got it to work
consistently.? Oscillation in the PA, and now I may have added a
new problem when I accidentally overdrove the mic input.? Several
folks in this group gave me good suggestions, but despite all the
help I keep ending up frustrated.? So, in the hope that this kit
might bring someone pleasure, I offer it free to a good home.? Any
takers?
73 Joe P. AB3LD
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Re: Bitx20a FREE to a good home
If you haven't had a taker I'll go for it.? ?I have some equipment that I can troubleshoot with.?
73, MichaEl KM4OLT
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Bitx20a FREE to a good home
Hello,
I built a Hendricks Bitx20A kit a few years ago.? It actually worked for a bit, had one QSO, but I never got it to work consistently.? Oscillation in the PA, and now I may have added a new problem when I accidentally overdrove the mic input.? Several folks in this group gave me good suggestions, but despite all the help I keep ending up frustrated.? So, in the hope that this kit might bring someone pleasure, I offer it free to a good home.? Any takers?
73 Joe P. AB3LD
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Re: Bitx 40 Hardware Questions
C93, C103, R106 are not stuffed, and are not needed.
The board is stuffed with MMBT3904's, not BC849's. ?I doubt swapping the MMBT3904's out would improve anything.
Haven't heard many complaints about cold solder joints on R's and C's.
Most boards arrive in working condition, just follow the directions at
Of boards that don't work, it's often trouble with the toroids such as broken or shorted or cold solder joints on the wires.
Perhaps the enamel is not scraped off enough, or scraped off too far back to where they short.
Be careful of all the extra flying leads on those connectors, perhaps cover the ends with tape to avoid them shorting to stuff.
Be careful of the IRF510 heatsink, it is at 12v and a flying lead shorting to that will blow your Raduino.
though the wires on all those toroids are sometimes broken or don't have enough enamel scraped off to be soldered down properly or are shorted.
when they arrive or perhaps?
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On Sat, Dec 2, 2017 at 11:23 am, James Lawrie wrote:
First question is what are the empty pads a trimmer used for, should I add trimmers to these, and if so what value would they be?
Second question the sm Transistors are?BC849, would it make any difference to swap out the BC849s with better spec RF Transistors?
Third Question I've noticed some solder joints on the caps and resistors that appear cold, haven't tested yet but have others had this issue? it's an easy fix but just curious.
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Bitx 40 Hardware Questions
Hello,
I have purchased 3 Bitx 40s v3 and I'm totally new to this transceiver so I have a couple of questions about the PCB and the Transistors.
First question is what are the empty pads a trimmer used for, should I add trimmers to these, and if so what value would they be?
Second question the sm Transistors are?BC849, would it make any difference to swap out the BC849s with better spec RF Transistors?
Third Question I've noticed some solder joints on the caps and resistors that appear cold, haven't tested yet but have others had this issue? it's an easy fix but just curious.
Thanks,
Jim
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Hello Paul:
Well, yes, I used Si5351, since I am following Farhan's instructions as best I can.
Basically, my set corresponds to the idea of Farhan, except in the control, since I am using an Arduino Mega 2560 board and mechanical encoders.
The main difference, apart from the previous one, is that in the design of my PCB I have included the Si5351, so the connections of this IC to the mixers are very short.
In the attached pdf you can see the design.
In my receiver? some birdies appear, but it works acceptably well. In fact, I get clear signals in all the bands (you can see it in the video)
73 Andr¨¦s EB7ME
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Been a while since anyone asked about a 20a. Take a look at It sounds like you have all you need to intelligently troubleshoot it.
Leonard
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OK I am reviving my very old thread, because without getting it working, I put it aside -- for a few years! ?Now trying again. It is a Bitx20A kit from Hendricks, built but never worked right for long.
So now I think I have have a problem with the nim preamp. ?I was trying align it and accidentally injected my signal generator's default signal into the mic input. ?That's 10 volts at 10 kHz. ?Maybe I blew Q15? ?Any suggestions how to check? ?Maybe voltages on Q15? ?Or signal past it? ?I have spare 2n3904s liying around and could switch it out but I'd like to test first if possible. ?I have a scope. ?Thanks in advance,
Joe P.
AB3LD
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Re: Help with wiring Easy Digi PTT
On mine I used an inverter for RTS so it would work with my IC-706, and then when I went to connect it to my bitx40 (with the EASY-DIGI interface too) it wouldn't key PTT for me, so I used Allard's CW circuit. Info here:
--
Ryan Flowers - W7RLF
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Re: Help with wiring Easy Digi PTT
Do it after the opto??
Just an inverter.
Amazing, I wonder how
they figured out all the simulation stuff at Circuit Lab.
Others were built on
the SPICE stuff done and released because it was funded by tax
payers.
On 12/1/2017 1:08 PM, David Arthur
wrote:
Yea, I guess the optocoupler doesn't need a full 5V
to close the PTT circuit. I'll try it without R1 and see what
happens.
This editor is Circuit Lab, which is a fantastic
editor and simulator, but is (understandably) non-free. I
normally do design in Eagle, but Circuit Lab?+ a screen shot
is a quick and dirty way to share something.
On Fri, Dec 1, 2017 at 3:59 PM Michael Hagen < motdog@...>
wrote:
That 1K in the
emitter cuts your signal in half?? With Q1 fully on,
D1 gets 1/2 of Vcc (5V).? So your output on D1 is less
than 2V.
I like you
schematic editor, what is it?
Mike, WA6ISP
On
12/1/2017 12:48 PM, David Arthur wrote:
Ok, got things working! All that was
missing was a diode from the Collector.?
Here's my final circuit:?
PTT toggles on and off from WSJT-X as expected :)
Thanks for all the help!?
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
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Re: Help with wiring Easy Digi PTT
Yea, I guess the optocoupler doesn't need a full 5V to close the PTT circuit. I'll try it without R1 and see what happens.
This editor is Circuit Lab, which is a fantastic editor and simulator, but is (understandably) non-free. I normally do design in Eagle, but Circuit Lab?+ a screen shot is a quick and dirty way to share something.
On Fri, Dec 1, 2017 at 3:59 PM Michael Hagen < motdog@...> wrote:
That 1K in the emitter
cuts your signal in half?? With Q1 fully on, D1 gets 1/2 of
Vcc (5V).? So your output on D1 is less than 2V.
I like you schematic editor,
what is it?
Mike, WA6ISP
On 12/1/2017 12:48 PM, David Arthur
wrote:
Ok, got things
working! All that was missing was a diode from the Collector.?
Here's my final circuit:?
PTT toggles on and off from WSJT-X as expected :)
Thanks for all the help!?
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
|
Re: Help with wiring Easy Digi PTT
That 1K in the emitter
cuts your signal in half?? With Q1 fully on, D1 gets 1/2 of
Vcc (5V).? So your output on D1 is less than 2V.
I like you schematic editor,
what is it?
Mike, WA6ISP
On 12/1/2017 12:48 PM, David Arthur
wrote:
Ok, got things
working! All that was missing was a diode from the Collector.?
Here's my final circuit:?
PTT toggles on and off from WSJT-X as expected :)
Thanks for all the help!?
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
|
Re: Help with wiring Easy Digi PTT
Ok, got things working! All that was missing was a diode from the Collector.? Here's my final circuit:?  PTT toggles on and off from WSJT-X as expected :) Thanks for all the help!?
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ekelley
Michael Monteith
James Lawrie
Andr¨¦s Moreno
