Re: Bitx40 - receiver works great, but do not transmit
#bitx40help
Ivan, You are correct.? Q 13 seems fine.? Since you tested the PA, we need to work backwards in the circuit.? Looking at the schematic, Q4 is next, when transmitting.? Check the voltages on Q4.? If fine, check Q5, then Q6.? I think this covers the TX chain. Look at the chart and test the transistors that have voltages during transmit.? You should find one, not correct and that will be where your problem lies.
Good luck, Marco - KG5PRT?
On Feb 11, 2018 11:04 AM, "Ivan Ilyichev" < ilyichev.ivan@...> wrote: I use a 13.5 , 2 amp power source instead of 12 volts lead-acid battery, like in shown voltages chart.
Remeasured voltages are:
Q13: collector 13.34 v, base 4.21 v, emmitter 3.57 v
As i see they are practically the same as in voltage chart.
|
I noticed that several people have posted the need for a Raduino board.? I have a Raduino board, marked 944/10 in ink, with 8 pin cable for sale.? I am not using the board as I am making my own custom implementation for my uBITX.? The cost is $30.00, including USPS Priority Mail, to US mainland, Alaska,? Hawaii, Puerto Rico or U.S. Virgin Islands addresses ONLY.? I will accept only cash or PAYPAL for payment.
Dennis KG4RUL
Contact me by eMail for further details: kg4rul(at)comcast.net
|
SUPER!! I hope more people will follow your example. (Love the board holder!)
Jack, W8TEE
From: KC9SGV <kc9sgv@...>
To: [email protected]
Sent: Sunday, February 11, 2018 12:10 PM
Subject: Re: [BITX20] Raduino seperate
Thanks, Jack,
Yep, been working on my SMD soldering skills... Just waiting on my SI5351A's to arrive. I have all the rest.
SMD soldering skill training progress here...
Bernie, KC9SGV On Feb 11, 2018, at 10:55 AM, Jack Purdum via Groups.Io < jjpurdum@...> wrote: Bernie:
Don't let the SMD stuff scare you. Have you tied working with them? True, it's a little daunting at first, but not too bad once you've experimented with them. I'll be 75 in a few months and, as shaky as my hands are with bad eyes to boot, I can still work with them. Invest a couple of bucks in this experimenter's package: eBay #172880707800. It allows you to 1) try working with SMD parts, 2) has different sizes so you can determine the smallest size you can comfortably work with, and 3) might even help you overcome the SMD "dreads". There's a move afoot for homebrewers that sees more and more SMD boards coming out, mainly because part are cheap and they allow for small board sizes, hence lower costs. It's worth a try!
Jack, W8TEE
So, We are waiting for a link to a shopping cart for spares on .
Can we also please have a link here on this forum to Mike Hagen ? The dead Raduino issue is a huge problem. No spares and SMD soldering required if you want to fix the Raduino yourself....
Bernie, KC9SGV
On Feb 11, 2018, at 10:21 AM, David Nelson < kc2ipx@...> wrote: You can get an improved raduino from Mike Hagen on this forum Dave
|
Re: wrong frequency after software change.
#ubitx
Thank you MIke and Ian.
The eeprom was my first thought but I eliminated it thinking that it
would be initialized each time you load a different software.
Where can I download the uBitx manager from?
--
73, Yvon NU6I
|
Thanks, Jack,
Yep, been working on my SMD soldering skills... Just waiting on my SI5351A's to arrive. I have all the rest.
SMD soldering skill training progress here...
Bernie, KC9SGV
toggle quoted message
Show quoted text
On Feb 11, 2018, at 10:55 AM, Jack Purdum via Groups.Io < jjpurdum@...> wrote: Bernie:
Don't let the SMD stuff scare you. Have you tied working with them? True, it's a little daunting at first, but not too bad once you've experimented with them. I'll be 75 in a few months and, as shaky as my hands are with bad eyes to boot, I can still work with them. Invest a couple of bucks in this experimenter's package: eBay #172880707800. It allows you to 1) try working with SMD parts, 2) has different sizes so you can determine the smallest size you can comfortably work with, and 3) might even help you overcome the SMD "dreads". There's a move afoot for homebrewers that sees more and more SMD boards coming out, mainly because part are cheap and they allow for small board sizes, hence lower costs. It's worth a try!
Jack, W8TEE
So, We are waiting for a link to a shopping cart for spares on .
Can we also please have a link here on this forum to Mike Hagen ? The dead Raduino issue is a huge problem. No spares and SMD soldering required if you want to fix the Raduino yourself....
Bernie, KC9SGV
On Feb 11, 2018, at 10:21 AM, David Nelson < kc2ipx@...> wrote: You can get an improved raduino from Mike Hagen on this forum Dave
|
Tim,
the AF potentiometer deliverd by HF Signals with the BITX40 kit
has a value of 10k.
Am 11.02.2018 um 15:39 schrieb Tim
Gorman:
toggle quoted message
Show quoted text
Henning,
Thank you for the information. Your data is quite informative. I
have bookmarked your link.
I don't have an actual radio to test against. I am hoping my ubitx
will ship in the next few days.?
In measuring the agc board itself, using a 1K resistor as a load,
a 100mvPP input results in an 18mvPP output across the 1K
resistor. Since I don't know the load resistance of the volume pot
and the final AF amp I just picked 1Kohm as a representative
value. If this is true the volume will have to be turned up
significantly in order to get the same speaker output. The AGC
board seems to provide a gain of 5 (18mv to 90mv) while the gain
of the input is about 12 (100mvPP to 1200mvPP) so it does seem to
provide significant gain compression as the output of the AF
preamp goes up.?
I look forward to actually measuring the AGC boards functionality
when I get my ubitx put together.?
tim ab0wr
|
And a lot of thru hole parts are becoming obsolete
73
Ken VA3ABN.
On Sun, Feb 11, 2018 at 11:55 AM, Jack Purdum via Groups.Io <jjpurdum@...> wrote: Bernie:
Don't let the SMD stuff scare you. Have you tied working with them? True, it's a little daunting at first, but not too bad once you've experimented with them. I'll be 75 in a few months and, as shaky as my hands are with bad eyes to boot, I can still work with them. Invest a couple of bucks in this experimenter's package: eBay #172880707800. It allows you to 1) try working with SMD parts, 2) has different sizes so you can determine the smallest size you can comfortably work with, and 3) might even help you overcome the SMD "dreads". There's a move afoot for homebrewers that sees more and more SMD boards coming out, mainly because part are cheap and they allow for small board sizes, hence lower costs. It's worth a try!
Jack, W8TEE
So, We are waiting for a link to a shopping cart for spares on .
Can we also please have a link here on this forum to Mike Hagen ? The dead Raduino issue is a huge problem. No spares and SMD soldering required if you want to fix the Raduino yourself....
Bernie, KC9SGV
On Feb 11, 2018, at 10:21 AM, David Nelson < kc2ipx@...> wrote: You can get an improved raduino from Mike Hagen on this forum Dave
|
Re: Bitx40 - receiver works great, but do not transmit
#bitx40help
I use a 13.5 , 2 amp power source instead of 12 volts lead-acid battery, like in shown voltages chart.
Remeasured voltages are:
Q13: collector 13.34 v, base 4.21 v, emmitter 3.57 v
As i see they are practically the same as in voltage chart.
|
Re: uBITX woes, feeling disheartened.
#ubitx
I am ?putting black lead of vom on ground (black wire of the power connection and red lead of vom on the pin I am measuring. ?Is this correct? The square pin 1is [] ok you said go clockwise counting so the pin under pin1 is next pin to count. Than at bottom of that row cross over to next row at bottom and that should be next pin to start counting. Am I correct. I will try today again to measure voltage again. Thanks for your help. ?73’s de AC8XZ?
|
Re: What firmware do you suggest for uBitx???
I think it's always a good idea to get the rig working with the "standard" software. Then look at a single mod you'd like to make. Making two or more mods at once complicates things if they don't work when you're done. Doing one at a time makes it easier to "undo" the mod and see what went wrong.
Jack, W8TEE
From: Paul Schumacher via Groups.Io <wnpauls@...>
To: [email protected]
Sent: Sunday, February 11, 2018 11:44 AM
Subject: [BITX20] What firmware do you suggest for uBitx???
Is the factory default recommended??
Or one of the updates?
thanks,
Paul K0ZYV
|
Bernie:
Don't let the SMD stuff scare you. Have you tied working with them? True, it's a little daunting at first, but not too bad once you've experimented with them. I'll be 75 in a few months and, as shaky as my hands are with bad eyes to boot, I can still work with them. Invest a couple of bucks in this experimenter's package: eBay #172880707800. It allows you to 1) try working with SMD parts, 2) has different sizes so you can determine the smallest size you can comfortably work with, and 3) might even help you overcome the SMD "dreads". There's a move afoot for homebrewers that sees more and more SMD boards coming out, mainly because part are cheap and they allow for small board sizes, hence lower costs. It's worth a try!
Jack, W8TEE
From: KC9SGV <kc9sgv@...>
To: [email protected]
Sent: Sunday, February 11, 2018 11:45 AM
Subject: Re: [BITX20] Raduino seperate
So, We are waiting for a link to a shopping cart for spares on .
Can we also please have a link here on this forum to Mike Hagen ? The dead Raduino issue is a huge problem. No spares and SMD soldering required if you want to fix the Raduino yourself....
Bernie, KC9SGV
On Feb 11, 2018, at 10:21 AM, David Nelson < kc2ipx@...> wrote: You can get an improved raduino from Mike Hagen on this forum Dave
|
So, We are waiting for a link to a shopping cart for spares on .
Can we also please have a link here on this forum to Mike Hagen ? The dead Raduino issue is a huge problem. No spares and SMD soldering required if you want to fix the Raduino yourself....
Bernie, KC9SGV
toggle quoted message
Show quoted text
On Feb 11, 2018, at 10:21 AM, David Nelson < kc2ipx@...> wrote: You can get an improved raduino from Mike Hagen on this forum Dave
|
What firmware do you suggest for uBitx???
Is the factory default recommended??
Or one of the updates?
thanks,
Paul K0ZYV
|
Looks like L3, and possibly other series elements in the 40 m filter got way too much voltage. You’ll probably have to use an ohmmeter to test out each connection and see what has become non-conductive. ?I suspect Q 13 got fried in the process, and there are
two other transistors that would’ve been connected that might’ve been damaged as well from the schematic. ?With some care, these can be replaced by ordinary 2N3904 transistors.
Thank you for showing that picture, it is quite impressive.
toggle quoted message
Show quoted text
Thanks for your quick response!
?
The Raduino is intact, tunes but not hearing too much at the moment.
?
Normal clicks are heard when the tuning pot is moved, and carriers are heard. I tried to transmit close with a Pixie (1w) and it is not heard.
?
Find below attached photos where was the spark and seems to be burned the track
 <IMG_20180211_114534.jpg>
|
Re: Second batch of uBITX shipping?
#ubitx
Hello
Apparently there are huge differences between shipping and delivery for different
methods (India Post versus DHL) and various delays in customs for various countries.
Also, local delivery in the destination country seems to vary significantly.? This makes
it less useful to post the actual shipping date for inside India.
It is not known at this time if popularity of the uBITX and BITX-40 will cause further
backlog in subsequent manufacturing and shipping.? If you can stand the possible
delay it might be best to get your order in early to position it as early as possible in
the delivery process.
Arv? K7HKL
_._
On Sun, Feb 11, 2018 at 8:48 AM, IZ8EGM Aurelio via Groups.Io <sarnese@...> wrote: hi Josias
I'm very calm, but I don't understand why they do not update this information on their site.
They could suspend purchases for some time. it makes no sense to continue buying while they are delivering those ordered in December.
I'll wait
73 to all
|
You can get an improved raduino from Mike Hagen on this forum Dave
On Sun, Feb 11, 2018 at 11:06 AM, Ken <chase8043@...> wrote: Hi Farhan
I had sent an email to HFSignals about ordering a seperate Raduino, as I had ordered the Bit40 before Raduino was available.
The reply I received was '
Yes. But you have to wait till our website is changed.'
It's been about 2 months and still nothing yet.
I know they are busy with existing Bitx40 and uBitx.
73
Ken VA3ABN
|
Re: Bitx40 - receiver works great, but do not transmit
#bitx40help
Also consider adding the protection diodes discussed an this page.? It will protect Q13 from high power transmitters that will cause Q13 to fail.
Hope this helps.
Marco - KG5PRT?
On Feb 11, 2018 10:00 AM, "M Garza" < mgarza896@...> wrote: I would say that Q13 is bad.?? Here is a document that shows approximate voltages to compare (Thanks Randy!).
Marco - KG5PRT?
|
Hi Farhan
I had sent an email to HFSignals about ordering a seperate Raduino, as I had ordered the Bit40 before Raduino was available.
The reply I received was '
Yes. But you have to wait till our website is changed.'
It's been about 2 months and still nothing yet.
I know they are busy with existing Bitx40 and uBitx.
73
Ken VA3ABN
|
Re: Bitx40 - receiver works great, but do not transmit
#bitx40help
I would say that Q13 is bad.?? Here is a document that shows approximate voltages to compare (Thanks Randy!).
Marco - KG5PRT?
On Feb 11, 2018 8:56 AM, "Ivan Ilyichev" < ilyichev.ivan@...> wrote: Thank you for answers.
I measure voltages around Q13 and Q14 when transmitting:
Q13: collector 11.77 v, base 3.73 v, emmitter 3.07 v
Q14: collector 12.02 v, base 1.09 v, emmitter 0.41 v
Power of transceiver comes from 7A-h lead-acid battery that produces up to 20 amps currency.
I describe in first message that PA works - if give him continuous wave to input in amplificate it well. I guess that problems somewhere in IF part but i do not know, how to check it with my equipment.
|
Re: Second batch of uBITX shipping?
#ubitx
hi Josias
I'm very calm, but I don't understand why they do not update this information on their site.
They could suspend purchases for some time. it makes no sense to continue buying while they are delivering those ordered in December.
I'll wait
73 to all
|
Ivan Ilyichev
David Nelson
Aurelio IZ8EGM