Did you try calibrating the BFO?? Mine arrived with BFO so far out that the crystal ladder filter was attenuating most of the audible signals.? Getting the BFO set reasonably close got my received audio much improved.? Mine is currently at ...55.5, pending some adjustment to keep the carrier nulled on transmit.
--Ron
K0EIA
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Re: Reverse Polarity Protection.
Raj,
FYI, The loss in receiver function was due to a reverse power application WITHOUT the protection diode installed.? That was why he was checking all of the active devices.
73
Evan
AC9TU
|
Cut and paste from previous message:
Check all the mixer diodes. Using the tip of your multimeter probe
gently press the legs towards the board and discover any solder given up in the
board's long travel! Do this on RX with a volume turned up. Any increase in
background noise and you have found it.
Raj
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Show quoted text
At 27-03-19, you wrote: Wired up my uBitx ver 5 and tried it out stock, I could hear a couple stations on 40, but were very low. Out of the 3 or 5 I heard I could only tune in one of them to the point I could understand them. I upgraded to a touch screen which seems to work fine, but I hear nothing but a low hiss from the speaker now. I do hear plenty of volume when I find a birdie though, so I assume the audio amp is still working.
What I found this morning, is I hear no difference if an antenna is connected or not. I hear no stations at all now.
Am I missing a step, or any suggestions what to look for?
KC8YJJ
|
Wired up my uBitx ver 5 and tried it out stock, I could hear a couple stations on 40, but were very low. Out of the 3 or 5 I heard I could only tune in one of them to the point I could understand them. I upgraded to a touch screen which seems to work fine, but I hear nothing but a low hiss from the speaker now. I do hear plenty of volume when I find a birdie though, so I assume the audio amp is still working.?
What I found this morning, is I hear no difference if an antenna is connected or not. I hear no stations at all now.?
Am I missing a step, or any suggestions what to look for?
KC8YJJ
|
Re: Reverse Polarity Protection.
I have not come across a dud transistor but many issues with
soldering.
Check all the mixer diodes. Using the tip of your multimeter probe
gently press the legs towards the board and discover any solder given up
in the
board's long travel! Do this on RX with a volume turned up. Any increase
in
background noise and you have found it.
Raj
At 27-03-19, you wrote:
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Show quoted text
Ah, thanks for that info
Evan.
I'll upgrade the polyswitch. I have them from 50mA to 8Amps here in
stock.
Still, I've not got my board going correctly. It is distorted and deaf
so I think a mixer is damaged. It is looking like removing the
transistors one by one to test them.? Hot air tool and tweezers to
work!
|
keep getting a? ?Check cat? error
Try
Bill K9JUI
On 3/27/2019 7:13 AM, Don Klier wrote:
Can? anyone?
send me the? right link? for the new? ver? 5 kd8cec? ?new
system? thanks in advance? I have? tried 3 different and? they
all fail? ?Don W0DJK
|
Ok? bill? well? ?i was? following the? link? ?"how? to upgrade"? from? kd8cec? ? ?that? does not? work? then i tried a? link? ?ide? thats? does? not? work? either? ?any way? Tnx? I keep? going back and? down loading? the? same? link as? you sent? ..its? the same? as? i have been? trying? maybe its? just me? ?hi hi? ?tnx? again? de? W0DJK? Don
Sorry I am not so good at this and keep trying thing also.? Guess
I will wait a while and see if some one does some upgrades.
Have a nice day.
Bill K9JUI
On 3/27/2019 7:45 AM, Don Klier wrote:
Hi Bill? ?I
have tried? all? ?again this moring and? same? dam? msg? ? so?
i? give? up? all teh? link i got sent are terh same? as? we?
were? trying? there? is? someting
relly? wrong
here? some? where? any sugestions??? Don w0DJK
Try
Bill K9JUI
On
3/27/2019 7:13 AM, Don Klier wrote:
Can?
anyone? send me the? right link? for the new? ver? 5
kd8cec? ?new system? thanks in advance? I have? tried
3 different and? they all fail? ?Don W0DJK
|
Sorry I am not so good at this and keep trying thing also.? Guess
I will wait a while and see if some one does some upgrades.
Have a nice day.
Bill K9JUI
On 3/27/2019 7:45 AM, Don Klier wrote:
toggle quoted message
Show quoted text
Hi Bill? ?I
have tried? all? ?again this moring and? same? dam? msg? ? so?
i? give? up? all teh? link i got sent are terh same? as? we?
were? trying? there? is? someting
relly? wrong
here? some? where? any sugestions??? Don w0DJK
Try
Bill K9JUI
On
3/27/2019 7:13 AM, Don Klier wrote:
Can?
anyone? send me the? right link? for the new? ver? 5
kd8cec? ?new system? thanks in advance? I have? tried
3 different and? they all fail? ?Don W0DJK
|
opps? sorry? wrong? Bill? ?I keep ggetting an error? msg? when i try to upload? its? getting discusting!? hi hi? ? Don W0DJK
On Wed, Mar 27, 2019 at 6:46 AM Don Klier via Groups.Io <parkpoint1939= gmail.com@groups.io> wrote: Hi Bill? ?I have tried? all? ?again this moring and? same? dam? msg? ? so? i? give? up? all teh? link i got sent are terh same? as? we? were? trying? there? is? someting relly? wrong here? some? where? any sugestions??? Don w0DJK
Try
Bill K9JUI
On 3/27/2019 7:13 AM, Don Klier wrote:
Can? anyone?
send me the? right link? for the new? ver? 5 kd8cec? ?new
system? thanks in advance? I have? tried 3 different and? they
all fail? ?Don W0DJK
|
Hi Bill? ?I have tried? all? ?again this moring and? same? dam? msg? ? so? i? give? up? all teh? link i got sent are terh same? as? we? were? trying? there? is? someting relly? wrong here? some? where? any sugestions??? Don w0DJK
Try
Bill K9JUI
On 3/27/2019 7:13 AM, Don Klier wrote:
Can? anyone?
send me the? right link? for the new? ver? 5 kd8cec? ?new
system? thanks in advance? I have? tried 3 different and? they
all fail? ?Don W0DJK
|
This may help..
73,?
Kelly K5AID?
|
Re: Reverse Polarity Protection.
Yes, they are very useful! I have one and recommend? the addition to any workshop.
|
Try
Bill K9JUI
On 3/27/2019 7:13 AM, Don Klier wrote:
toggle quoted message
Show quoted text
Can? anyone?
send me the? right link? for the new? ver? 5 kd8cec? ?new
system? thanks in advance? I have? tried 3 different and? they
all fail? ?Don W0DJK
|
Re: Reverse Polarity Protection.
Here is an interesting link to a mosfet reverse polarity protection circuit. I found this mentioned in a post on this group from about a year ago.
Tom, wb6b
----
"Please don’t put red price stickers next to the negative battery pole......"
Ouch!
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Re: Shaking my head in disbelief....
Bill, I am leaning that way now... I noticed? the raduino has the mini usb connector. Time to go scrounge up a cable, and get to work. I'm going to load the fw for stock display? then try the Nextion enhanced display.
73,
Kelly K5AID?
|
Can? anyone? send me the? right link? for the new? ver? 5 kd8cec? ?new system? thanks in advance? I have? tried 3 different and? they all fail? ?Don W0DJK
|
Re: Shaking my head in disbelief....
Once you upgrade to kd8cdc software your tuning will be much better. I would just upgrade now as the calibration is so much better on the CDC code.
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Show quoted text
On Mar 27, 2019, at 2:23 AM, Kelly Mabry < kmabry2007@...> wrote: Oh, Raj, you were right about the red wire..?
Thanks!
Kelly K5AID?
|
Re: Board Map/Layout, Test Points? (V5)
In the old Kenwood days, it was not likely that an amateur radio operator would be able to duplicate the boards. ? That’s no longer the case.
I’ve had to figure out a few different connections in order to create the instructions on how to add an external daughter board to handle relay switches.
It wasn’t that hard. ? So I think most of us can succeed to the degree we need. ? ?
I have now ordered the siglent spectrum analyzer, which apparently is on backorder until April 12. ? The point raised by some here that service is available in the United States for that brand, ?made the difference.?? I hope to have it by the beginning
of May, to help deal with a noise problem at the emergency operations center (EOC) ?in our county. ? ? I’ve also managed to get a dummy load with a real RF 30 DB tap, possibly better than the homemade one that I made. ??
At some point I will then get the time to return to playing with these fascinating radios. ?Check my v3 with the outboard relay fix. ?? ?Get one of the new version fives, maybe put it in one of the nicer cases, see if adding one extra stage or so to some
of the output low pass filter’s makes any difference. ? If the relay wiring has been cleaned up, or if the daughterboard idea I’ve built is as successful as I thought, then one would think that adding even a little bit more would make it wildly successful.
? ?
I also need to widen out that crystal filter just a tad for WINLINK. ? And the same on a bitx 40 I have. ? ?I’ve got a little transistor hundred watt amp that I need to assemble, and then I think it could be a really cool ALE ?or WINLINK gateway.?
Cheers
Gordon
On Mar 27, 2019, at 06:00, Gordon Gibby < ggibby@...> wrote:
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Show quoted text
In this day and age, that would be somewhat like demanding he give up corporate intelligence knowledge. ?Layout is a valuable commodity.
I don't remember, Farhan has ever released board? layout or its photo
Sarma? ?vu3zmv
New Question:? I have the high res PDF schematic, and I have been searching around to see if I can find a high resolution board layout or graphic.? Is this out on the web somewhere??
The answer may be "no."? I'm coming into this new uBitx world from working on old Kenwoods, where I had the service manual with schematic, board graphic, and level diagrams.? Of course I don't really expect these to exist for a hundred dollar kit radio, but
it never hurts to ask before I put on the magnifying glasses and start tracing.??
Thanks!
--Ron
K0EIA
|
Re: Reverse Polarity Protection.
Sorry to hear about your uBitx board.? I have used these testers:
with some success in circuit testing.? Since it is just looking for gain, it is a fairly good indication that the device is not dead.? Been a handy device as it can also check caps and coils, though not too small of values.
The devices are available from a number of manufacturers on the Web.
73
Evan
AC9TU
|
Re: Board Map/Layout, Test Points? (V5)
In this day and age, that would be somewhat like demanding he give up corporate intelligence knowledge. ?Layout is a valuable commodity.
toggle quoted message
Show quoted text
I don't remember, Farhan has ever released board? layout or its photo
Sarma? ?vu3zmv
New Question:? I have the high res PDF schematic, and I have been searching around to see if I can find a high resolution board layout or graphic.? Is this out on the web somewhere??
The answer may be "no."? I'm coming into this new uBitx world from working on old Kenwoods, where I had the service manual with schematic, board graphic, and level diagrams.? Of course I don't really expect these to exist for a hundred dollar kit radio, but
it never hurts to ask before I put on the magnifying glasses and start tracing.??
Thanks!
--Ron
K0EIA
|
Raj vu2zap