Date   

Re: #bitx40 #ubitx #bitx40 #ubitx

Tim Gorman
 

Don,

I echo your concern about using a non-linear device in series with the
RF. It becomes a simple unbalanced mixer.

I was referring to the datasheet of the pin attenuator.
www.nxp.com/docs/en/data-sheet/BAP64Q.pdf

Here is an article that has an interesting take on using AGC:

http://ke3ij.com/AGC8040.htm

tim ab0wr

On Tue, 27 Mar 2018 06:05:07 -0700
"Don, ND6T via Groups.Io" <nd6t_6=yahoo.com@groups.io> wrote:

After sleeping on it I've got a fresh perspective: Why PIN diodes?
We're not at a significant power point. Why a bridge arrangement? At
this position we are not concerned with maintaining impedance at idle
conditions, they become less important as signals are being
attenuated. So, with 1N4148 switching diodes I found that just the
two series diodes will impose an idle loss of 3 dB and a control
range of 62 dB. The idle current is around 8.3 milliamps. Of course,
going to a single diode (things are getting better) I measured an
more agreeable 1.4 dB insertion loss with a 6 ma. bias and a control
range of 49 dB at 7 MHz, 36 dB at 30 MHz. My principle concerns with
using a device in series with the receive path is the generation of
IM components, especially when biased for partial conduction. BCI
could be a real concern. That was one of the beauties of the shunt
transistor. Tim, the limiting factor of the dynamic range is the
finite Rds. Yes, I was surprised also, that I got 20 dB. This is one
of the reasons that I question most everything. Sometimes I am
rewarded by a boon. At the least I receive an education. Oh, and what
article are you referring? -Don


Re: FS:Ubitx and Bitx40 ++

_Dave_ AD0B
 

Email sent to n8dah@... 
Re ubitx.


Re: #bitx40 #ubitx #bitx40 #ubitx

Tim Gorman
 

On Mon, 26 Mar 2018 22:10:07 -0700
"Jerry Gaffke via Groups.Io" <jgaffke=yahoo.com@groups.io> wrote:


If the audio is not loud enough then increase the control voltage, up
to a max of 10 or 12v. Should be easy enough with an op-amp.
Though I have not done this, or ever designed an AGC system.
So take this advice with a large grain of salt. 
How do you decide if the audio is not loud enough? Especially in a
simple receiver like this? AGC usually works just opposite of this. It
is based on audio being too loud.



If for some reason you can't use the 10v swing, then could add a 5dB
amp prior to the attenuator. Or maybe goose up the bidi amps for a
little bit more gain.
This would seem to be eminently doable.


I'm thinking the attenuator should be in series with R37, 
the BAP64Q is designed for use in a 50 ohm environment.
R17 might be better. The 45Mhz filter is pretty broad. A mismatch here
might affect the receiver operation less.


Re: #bitx40help BITX40 LSB Winlink #bitx40help

M Garza <mgarza896@...>
 

Daniel,
Your understanding is correct.
We have a 12 MHz IF.  5 MHZ BFO gives us a 7 MHZ LSB signal and a 19 MHZ BFO gives us a 7 MHZ USB signal.  The IF & filter are constant.  In our case, the BFO is moved to either side of the ladder filter to change side bands.

Marco - KG5PRT 

On Tue, Mar 27, 2018, 8:47 AM Daniel Crane <danjamitch@...> wrote:
Thanks Joe.  Yup, Allard's sketch.  That's what I got from Marco and Gordon's posts.

Just to recite my new understanding, for those like me whose facility with superhet design strays just into and out of visibility -

The magic is in the ladder/BFO combination, which shears off the carrier and unwanted sideband, while passing the wanted sideband.  This is not touched in Allard's sketch.  So...  if you use, say, a 10MHz IF, then  3 MHz BFO will get you 7MHz LSB and a 4 MHz BFO will get you 14MHz USB.  Of course you have to filter to make sure you have signal content where you want it to look.

To get 7MHz USB you need a BFO at (drumroll) 17 MHz.  You have to point the ladder at -7Mhz in order to get the mirror image sideband.  Am I right?

Dan

On Mon, Mar 26, 2018 at 9:49 PM, Joe Puma <kd2nfc@...> wrote:
I thought the b40 has USB with the latest version Allard’s? sketch. I’ve used my bitx40 with wsjtx which needs USB too. Winlink should work for you. 



On Mar 26, 2018, at 8:39 PM, Daniel Crane <danjamitch@...> wrote:

I am trying to find a way to connect to Winlink with my BitX40.

I have one of the last Bitx40's shipped, in late November, just before the ubitx started to arrive.  Another fellow whose name I cannot recall got one at the same time and had a lot of difficulty getting it going.  The group here helped him along and over a period of weeks got him up and running.  Just at the conclusion of that process he reported that he had that day made successful Winlink connections.  From the context and timing he would not have converted his BitX 40 to USB.

Does anybody here know if it is possible to connect to Winlink on lower sideband?  I've tried WINMOR, ARDOP, and VARA, but no joy.  No RMS answers my calls.  I have made a number of PSK-31 QSO's between here (LA) and stations as far away as Washington state, so I know my radio works.  I decode RTTY and Olivia as well.

I posted this question on the Winlink group and got the school answer, "Winlink requires USB".

I uptune so as to match 1500Hz center frequencies.  And I uptune 700Hz more because my BitX isn't calibrated.  Occasionally I get lucky and see an RMS engaged  in a session and center that signal. I patiently tune in 100Hz increments.

But still no joy.  Any ideas, other than move on to USB?

Thanks/Dan
KM6GRV





Re: #bitx40help BITX40 LSB Winlink #bitx40help

Daniel Crane
 

Thanks Joe.  Yup, Allard's sketch.  That's what I got from Marco and Gordon's posts.

Just to recite my new understanding, for those like me whose facility with superhet design strays just into and out of visibility -

The magic is in the ladder/BFO combination, which shears off the carrier and unwanted sideband, while passing the wanted sideband.  This is not touched in Allard's sketch.  So...  if you use, say, a 10MHz IF, then  3 MHz BFO will get you 7MHz LSB and a 4 MHz BFO will get you 14MHz USB.  Of course you have to filter to make sure you have signal content where you want it to look.

To get 7MHz USB you need a BFO at (drumroll) 17 MHz.  You have to point the ladder at -7Mhz in order to get the mirror image sideband.  Am I right?

Dan

On Mon, Mar 26, 2018 at 9:49 PM, Joe Puma <kd2nfc@...> wrote:
I thought the b40 has USB with the latest version Allard’s? sketch. I’ve used my bitx40 with wsjtx which needs USB too. Winlink should work for you. 



On Mar 26, 2018, at 8:39 PM, Daniel Crane <danjamitch@...> wrote:

I am trying to find a way to connect to Winlink with my BitX40.

I have one of the last Bitx40's shipped, in late November, just before the ubitx started to arrive.  Another fellow whose name I cannot recall got one at the same time and had a lot of difficulty getting it going.  The group here helped him along and over a period of weeks got him up and running.  Just at the conclusion of that process he reported that he had that day made successful Winlink connections.  From the context and timing he would not have converted his BitX 40 to USB.

Does anybody here know if it is possible to connect to Winlink on lower sideband?  I've tried WINMOR, ARDOP, and VARA, but no joy.  No RMS answers my calls.  I have made a number of PSK-31 QSO's between here (LA) and stations as far away as Washington state, so I know my radio works.  I decode RTTY and Olivia as well.

I posted this question on the Winlink group and got the school answer, "Winlink requires USB".

I uptune so as to match 1500Hz center frequencies.  And I uptune 700Hz more because my BitX isn't calibrated.  Occasionally I get lucky and see an RMS engaged  in a session and center that signal. I patiently tune in 100Hz increments.

But still no joy.  Any ideas, other than move on to USB?

Thanks/Dan
KM6GRV





Re: #bitx40 #ubitx #bitx40 #ubitx

Don, ND6T
 

After sleeping on it I've got a fresh perspective: Why PIN diodes? We're not at a significant power point. Why a bridge arrangement? At this position we are not concerned with maintaining impedance at idle conditions, they become less important as signals are being attenuated. So, with 1N4148 switching diodes I found that just the two series diodes will impose an idle loss of 3 dB and a control range of 62 dB. The idle current is around 8.3 milliamps. Of course, going to a single diode (things are getting better) I measured an more agreeable 1.4 dB insertion loss with a 6 ma. bias and a control range of 49 dB at 7 MHz, 36 dB at 30 MHz. My principle concerns with using a device in series with the receive path is the generation of IM components, especially when biased for partial conduction. BCI could be a real concern. That was one of the beauties of the shunt transistor.
Tim, the limiting factor of the dynamic range is the finite Rds. Yes, I was surprised also, that I got 20 dB. This is one of the reasons that I question most everything. Sometimes I am rewarded by a boon. At the least I receive an education. Oh, and what article are you referring? -Don


Re: Cases

Paul Galburt - K2AYZ
 

I received my roll very quickly! It is very thin, but has very strong adhesive and seems like a qualityi product. It seems like the best copper tape deal out there.


Re: Placed order #ubitx

Paul Galburt - K2AYZ
 

You can write to hfsignals "at" gmail.......

I think you are in the queue which is as stated by others quite a few weeks at this point. I marked my calendar at 12 weeks and now am having fun researching related topics.

73,

Paul


Re: Placed order #ubitx

a.vision
 

I think that is normal I am now in week six and as you only received order confirmation from paypal judging by previous comments only a few more weeks to go.



Sent from my Samsung Galaxy smartphone.

-------- Original message --------
From: Impulsive.force@...
Date: 27/03/2018 10:52 (GMT+00:00)
To: BITX20@groups.io
Subject: [BITX20] Placed order #ubitx

Dear Sirs, I placed an order for a uBitX last week via PayPal. PayPal acknowledged the transaction but I have not received any notification from hfsignals that the order was received. I cant find any other way of contacting hfsignals as far as I can see.

Did previous purchasers receive any order notification or do I just assume its all ok?
Thanks




Placed order #ubitx

Impulsive.force@...
 

Dear Sirs, I placed an order for a uBitX last week via PayPal. PayPal acknowledged the transaction but I have not received any notification from hfsignals that the order was received. I cant find any other way of contacting hfsignals as far as I can see.

Did previous purchasers receive any order notification or do I just assume its all ok?
Thanks


Re: The issues of the TDA2822

 

The datasheet clearly tells me that the chip was made to run at 9V or less. They dont mention output at higher voltages
although the max is 15V. Now at 12-13v a NPN/PNP pair will give 5-6w into 4 ohms.. too much for this little chip.
Better safe than sorry, reduce the voltage.

Raj


At 26/03/2018, you wrote:
On Mon, Mar 26, 2018 at 02:50 am, Kevin Luxford wrote:
Could you please enlighten this old ham before he ruins his lovely uBITX?

The simplest fix is to replace the WX branded TDA2822 with one from a reputable manufacturer.

There is no evidence that further mods are necessary.


Re: #bitx40 #ubitx #bitx40 #ubitx

Jerry Gaffke
 

This is what feedback is for.
>  I'm not sure how you design an agc amp to work against two such different slopes. 

If the audio is not loud enough then increase the control voltage, up to a max of 10 or 12v.
Should be easy enough with an op-amp.
Though I have not done this, or ever designed an AGC system.
So take this advice with a large grain of salt. 

If for some reason you can't use the 10v swing, then could add a 5dB amp prior to the attenuator.
Or maybe goose up the bidi amps for a little bit more gain.

Farhan's notes here:  http://www.hfsignals.com/index.php/ubitx-circuit-description/
say that the front end LPF has 1dB loss, the mixers 7dB loss, the bidi amps 16dB of gain.
I'm not sure exactly what the loss is through the crystal filters, let's assume 4dB.
So the front end up lines up as follows from antenna to the input of the demodulator:
-1dB -7dB + 16dB -4dB -7dB +16dB -4dB  = +9dB
I guess the demodulator is going to be something like another 7dB loss, as it's just another mixer.
So the entire receiver up to the audio pre-amp has very close to zero gain.

I'm thinking the attenuator should be in series with R37, 
the BAP64Q is designed for use in a 50 ohm environment.

Jerry, KE7ER


On Mon, Mar 26, 2018 at 09:32 pm, Tim Gorman wrote:
Jerry,

Looking at Figure 6 the useful part of the graph is from about .3v to
2v for control voltage. That gives you a swing of 60db loss to about
5db loss, about 3db per tenth of a volt of agc. You need a swing of 2v
to 10v to get from about 5db loss to 2db loss or about .03db per tenth
of a volt. I'm not sure how you design an agc amp to work against two
such different slopes.

The lines on Fig 4 are like elevation lines on a topographic map. When
lines are close together you have a steep slope and when they are
further apart you have less steep slope. Designing an agc amp to work
with two such different slopes, one slope before a threshold and a
different slope after the threshold is probably not a trivial thing to
do.

I'm not saying you can't do it. I just can't get my head wrapped around
how you do it at 11:20pm at night!


tim ab0wr


Re: #bitx40help BITX40 LSB Winlink #bitx40help

Joe Puma
 

I thought the b40 has USB with the latest version Allard’s? sketch. I’ve used my bitx40 with wsjtx which needs USB too. Winlink should work for you. 



On Mar 26, 2018, at 8:39 PM, Daniel Crane <danjamitch@...> wrote:

I am trying to find a way to connect to Winlink with my BitX40.

I have one of the last Bitx40's shipped, in late November, just before the ubitx started to arrive.  Another fellow whose name I cannot recall got one at the same time and had a lot of difficulty getting it going.  The group here helped him along and over a period of weeks got him up and running.  Just at the conclusion of that process he reported that he had that day made successful Winlink connections.  From the context and timing he would not have converted his BitX 40 to USB.

Does anybody here know if it is possible to connect to Winlink on lower sideband?  I've tried WINMOR, ARDOP, and VARA, but no joy.  No RMS answers my calls.  I have made a number of PSK-31 QSO's between here (LA) and stations as far away as Washington state, so I know my radio works.  I decode RTTY and Olivia as well.

I posted this question on the Winlink group and got the school answer, "Winlink requires USB".

I uptune so as to match 1500Hz center frequencies.  And I uptune 700Hz more because my BitX isn't calibrated.  Occasionally I get lucky and see an RMS engaged  in a session and center that signal. I patiently tune in 100Hz increments.

But still no joy.  Any ideas, other than move on to USB?

Thanks/Dan
KM6GRV




Re: #bitx40 #ubitx #bitx40 #ubitx

Tim Gorman
 

Jerry,

Looking at Figure 6 the useful part of the graph is from about .3v to
2v for control voltage. That gives you a swing of 60db loss to about
5db loss, about 3db per tenth of a volt of agc. You need a swing of 2v
to 10v to get from about 5db loss to 2db loss or about .03db per tenth
of a volt. I'm not sure how you design an agc amp to work against two
such different slopes.

The lines on Fig 4 are like elevation lines on a topographic map. When
lines are close together you have a steep slope and when they are
further apart you have less steep slope. Designing an agc amp to work
with two such different slopes, one slope before a threshold and a
different slope after the threshold is probably not a trivial thing to
do.

I'm not saying you can't do it. I just can't get my head wrapped around
how you do it at 11:20pm at night!


tim ab0wr



On Mon, 26 Mar 2018 19:17:23 -0700
"Jerry Gaffke via Groups.Io" <jgaffke=yahoo.com@groups.io> wrote:

The nxp datasheet says 1.8db at 1ghz and 10v.  That's definitely
acceptable if used after the 12mhz amp.  Fig 4 shows maybe less
attenuation than 1.8db at 12mhz.


Re: #bitx40help BITX40 LSB Winlink #bitx40help

Daniel Crane
 

That was quick.

On Mon, Mar 26, 2018 at 7:54 PM, M Garza <mgarza896@...> wrote:
Daniel,
Have look here:  https://github.com/amunters/bitx40.  There are complete instructions on how to upgrade the software and make the necessary modifications to get USB and much more.
The BFO is adjusted via software.  There are a few hardware mods, but they are minimal and not all are needed to get USB.

Hope this helps.

Marco - KG5PRT

On Mon, Mar 26, 2018 at 9:44 PM, Gordon Gibby <ggibby@...> wrote:
I think the typical way people do it is to flip the VFO oscillator , and although the skirt might not be so wonderful, it works.


On Mar 26, 2018, at 22:08, Daniel Crane <danjamitch@...> wrote:

I thought that requires one to move the BFO to the other not quite as steep skirt of the ladder.

Dan

On Mon, Mar 26, 2018 at 5:47 PM, M Garza <mgarza896@...> wrote:
Gordon Gibby seems to be the Winlink guru.  I am sure he will chime in.
Why do you not want to upgrade your Bitx40 to do USB?  It doesn't sound very difficult.  
Allard worked very hard to make it as painless as possible.

Marco - KG5PRT

On Mon, Mar 26, 2018 at 7:39 PM, Daniel Crane <danjamitch@...> wrote:
I am trying to find a way to connect to Winlink with my BitX40.

I have one of the last Bitx40's shipped, in late November, just before the ubitx started to arrive.  Another fellow whose name I cannot recall got one at the same time and had a lot of difficulty getting it going.  The group here helped him along and over a period of weeks got him up and running.  Just at the conclusion of that process he reported that he had that day made successful Winlink connections.  From the context and timing he would not have converted his BitX 40 to USB.

Does anybody here know if it is possible to connect to Winlink on lower sideband?  I've tried WINMOR, ARDOP, and VARA, but no joy.  No RMS answers my calls.  I have made a number of PSK-31 QSO's between here (LA) and stations as far away as Washington state, so I know my radio works.  I decode RTTY and Olivia as well.

I posted this question on the Winlink group and got the school answer, "Winlink requires USB".

I uptune so as to match 1500Hz center frequencies.  And I uptune 700Hz more because my BitX isn't calibrated.  Occasionally I get lucky and see an RMS engaged  in a session and center that signal. I patiently tune in 100Hz increments.

But still no joy.  Any ideas, other than move on to USB?

Thanks/Dan
KM6GRV








Re: #bitx40help BITX40 LSB Winlink #bitx40help

Daniel Crane
 

Hey, thanks, Gordon.  I'm on it.

If anybody can spare me the search for the link, I'd dearly appreciate it.

Dan

On Mon, Mar 26, 2018 at 7:42 PM, Gordon Gibby <ggibby@...> wrote:
Daniel crane, you will have to put it on upper side band in  order to make WINLINK work.  While FLDI G.I. is able to invert the tones of PSK 31 to accommodate rigs stuck in lower sideband, WINLINK modem protocols do not have that ability.

There have been a couple of folks here who have written improved software, and I think it is available on Bitx X.net or something similar.  See the long list of web addresses at the end of each message.

Once you learn how to upload that software through the little USB port on the Arduino, using the free integrated development environment, life will be much easier for you.   It’s been a while, but I think I took one of their versions and modified it a bit for myself, and it works very nicely.

I’ve made a boatload of WINLINK connections using the bit X 40 and or MicroBitx 

I don’t know what gateway you’re trying to connect to, but if you telephone the systems operator for the gateway they will often help you.

Gordon


On Mar 26, 2018, at 20:47, M Garza <mgarza896@...> wrote:

Gordon Gibby seems to be the Winlink guru.  I am sure he will chime in.
Why do you not want to upgrade your Bitx40 to do USB?  It doesn't sound very difficult.  
Allard worked very hard to make it as painless as possible.

Marco - KG5PRT

On Mon, Mar 26, 2018 at 7:39 PM, Daniel Crane <danjamitch@...> wrote:
I am trying to find a way to connect to Winlink with my BitX40.

I have one of the last Bitx40's shipped, in late November, just before the ubitx started to arrive.  Another fellow whose name I cannot recall got one at the same time and had a lot of difficulty getting it going.  The group here helped him along and over a period of weeks got him up and running.  Just at the conclusion of that process he reported that he had that day made successful Winlink connections.  From the context and timing he would not have converted his BitX 40 to USB.

Does anybody here know if it is possible to connect to Winlink on lower sideband?  I've tried WINMOR, ARDOP, and VARA, but no joy.  No RMS answers my calls.  I have made a number of PSK-31 QSO's between here (LA) and stations as far away as Washington state, so I know my radio works.  I decode RTTY and Olivia as well.

I posted this question on the Winlink group and got the school answer, "Winlink requires USB".

I uptune so as to match 1500Hz center frequencies.  And I uptune 700Hz more because my BitX isn't calibrated.  Occasionally I get lucky and see an RMS engaged  in a session and center that signal. I patiently tune in 100Hz increments.

But still no joy.  Any ideas, other than move on to USB?

Thanks/Dan
KM6GRV






Re: #bitx40help BITX40 LSB Winlink #bitx40help

M Garza <mgarza896@...>
 

Daniel,
Have look here:  https://github.com/amunters/bitx40.  There are complete instructions on how to upgrade the software and make the necessary modifications to get USB and much more.
The BFO is adjusted via software.  There are a few hardware mods, but they are minimal and not all are needed to get USB.

Hope this helps.

Marco - KG5PRT

On Mon, Mar 26, 2018 at 9:44 PM, Gordon Gibby <ggibby@...> wrote:
I think the typical way people do it is to flip the VFO oscillator , and although the skirt might not be so wonderful, it works.


On Mar 26, 2018, at 22:08, Daniel Crane <danjamitch@...> wrote:

I thought that requires one to move the BFO to the other not quite as steep skirt of the ladder.

Dan

On Mon, Mar 26, 2018 at 5:47 PM, M Garza <mgarza896@...> wrote:
Gordon Gibby seems to be the Winlink guru.  I am sure he will chime in.
Why do you not want to upgrade your Bitx40 to do USB?  It doesn't sound very difficult.  
Allard worked very hard to make it as painless as possible.

Marco - KG5PRT

On Mon, Mar 26, 2018 at 7:39 PM, Daniel Crane <danjamitch@...> wrote:
I am trying to find a way to connect to Winlink with my BitX40.

I have one of the last Bitx40's shipped, in late November, just before the ubitx started to arrive.  Another fellow whose name I cannot recall got one at the same time and had a lot of difficulty getting it going.  The group here helped him along and over a period of weeks got him up and running.  Just at the conclusion of that process he reported that he had that day made successful Winlink connections.  From the context and timing he would not have converted his BitX 40 to USB.

Does anybody here know if it is possible to connect to Winlink on lower sideband?  I've tried WINMOR, ARDOP, and VARA, but no joy.  No RMS answers my calls.  I have made a number of PSK-31 QSO's between here (LA) and stations as far away as Washington state, so I know my radio works.  I decode RTTY and Olivia as well.

I posted this question on the Winlink group and got the school answer, "Winlink requires USB".

I uptune so as to match 1500Hz center frequencies.  And I uptune 700Hz more because my BitX isn't calibrated.  Occasionally I get lucky and see an RMS engaged  in a session and center that signal. I patiently tune in 100Hz increments.

But still no joy.  Any ideas, other than move on to USB?

Thanks/Dan
KM6GRV







Re: #bitx40help BITX40 LSB Winlink #bitx40help

Gordon Gibby <ggibby@...>
 

I think the typical way people do it is to flip the VFO oscillator , and although the skirt might not be so wonderful, it works.


On Mar 26, 2018, at 22:08, Daniel Crane <danjamitch@...> wrote:

I thought that requires one to move the BFO to the other not quite as steep skirt of the ladder.

Dan

On Mon, Mar 26, 2018 at 5:47 PM, M Garza <mgarza896@...> wrote:
Gordon Gibby seems to be the Winlink guru.  I am sure he will chime in.
Why do you not want to upgrade your Bitx40 to do USB?  It doesn't sound very difficult.  
Allard worked very hard to make it as painless as possible.

Marco - KG5PRT

On Mon, Mar 26, 2018 at 7:39 PM, Daniel Crane <danjamitch@...> wrote:
I am trying to find a way to connect to Winlink with my BitX40.

I have one of the last Bitx40's shipped, in late November, just before the ubitx started to arrive.  Another fellow whose name I cannot recall got one at the same time and had a lot of difficulty getting it going.  The group here helped him along and over a period of weeks got him up and running.  Just at the conclusion of that process he reported that he had that day made successful Winlink connections.  From the context and timing he would not have converted his BitX 40 to USB.

Does anybody here know if it is possible to connect to Winlink on lower sideband?  I've tried WINMOR, ARDOP, and VARA, but no joy.  No RMS answers my calls.  I have made a number of PSK-31 QSO's between here (LA) and stations as far away as Washington state, so I know my radio works.  I decode RTTY and Olivia as well.

I posted this question on the Winlink group and got the school answer, "Winlink requires USB".

I uptune so as to match 1500Hz center frequencies.  And I uptune 700Hz more because my BitX isn't calibrated.  Occasionally I get lucky and see an RMS engaged  in a session and center that signal. I patiently tune in 100Hz increments.

But still no joy.  Any ideas, other than move on to USB?

Thanks/Dan
KM6GRV






Re: #bitx40help BITX40 LSB Winlink #bitx40help

Gordon Gibby <ggibby@...>
 

Daniel crane, you will have to put it on upper side band in  order to make WINLINK work.  While FLDI G.I. is able to invert the tones of PSK 31 to accommodate rigs stuck in lower sideband, WINLINK modem protocols do not have that ability.

There have been a couple of folks here who have written improved software, and I think it is available on Bitx X.net or something similar.  See the long list of web addresses at the end of each message.

Once you learn how to upload that software through the little USB port on the Arduino, using the free integrated development environment, life will be much easier for you.   It’s been a while, but I think I took one of their versions and modified it a bit for myself, and it works very nicely.

I’ve made a boatload of WINLINK connections using the bit X 40 and or MicroBitx 

I don’t know what gateway you’re trying to connect to, but if you telephone the systems operator for the gateway they will often help you.

Gordon


On Mar 26, 2018, at 20:47, M Garza <mgarza896@...> wrote:

Gordon Gibby seems to be the Winlink guru.  I am sure he will chime in.
Why do you not want to upgrade your Bitx40 to do USB?  It doesn't sound very difficult.  
Allard worked very hard to make it as painless as possible.

Marco - KG5PRT

On Mon, Mar 26, 2018 at 7:39 PM, Daniel Crane <danjamitch@...> wrote:
I am trying to find a way to connect to Winlink with my BitX40.

I have one of the last Bitx40's shipped, in late November, just before the ubitx started to arrive.  Another fellow whose name I cannot recall got one at the same time and had a lot of difficulty getting it going.  The group here helped him along and over a period of weeks got him up and running.  Just at the conclusion of that process he reported that he had that day made successful Winlink connections.  From the context and timing he would not have converted his BitX 40 to USB.

Does anybody here know if it is possible to connect to Winlink on lower sideband?  I've tried WINMOR, ARDOP, and VARA, but no joy.  No RMS answers my calls.  I have made a number of PSK-31 QSO's between here (LA) and stations as far away as Washington state, so I know my radio works.  I decode RTTY and Olivia as well.

I posted this question on the Winlink group and got the school answer, "Winlink requires USB".

I uptune so as to match 1500Hz center frequencies.  And I uptune 700Hz more because my BitX isn't calibrated.  Occasionally I get lucky and see an RMS engaged  in a session and center that signal. I patiently tune in 100Hz increments.

But still no joy.  Any ideas, other than move on to USB?

Thanks/Dan
KM6GRV





Re: The issues of the TDA2822

k6kwq@...
 

Mine was dead out of the box

 

Sent from Mail for Windows 10

 


From: BITX20@groups.io <BITX20@groups.io> on behalf of Jerry Gaffke via Groups.Io <jgaffke@...>
Sent: Monday, March 26, 2018 2:08:30 PM
To: BITX20@groups.io
Subject: Re: [BITX20] The issues of the TDA2822
 
My impression is that the WX failure mode is one of too high a supply voltage
suddenly puncturing a barrier somewhere.  
There may be no noticeable heating prior to the failure.
Perhaps those cut from the periphery of the silicon wafer are more likely to fail.

Raj reports that with very loud audio coming through while running at 12v,
he can short the output of his FCI TDA2822 and have it get hot but not fail. 
There are likely other poor quality clones beyond the WX,
but TDA2822's from reputable vendors don't seem to fail even when abused a bit.

Jerry

On Mon, Mar 26, 2018 at 12:39 pm, Arvo KD9HLC wrote:
On Mon, Mar 26, 2018 at 12:00 pm, Tim Gorman wrote:
I have run the tda2822wx for 24/7 over the past week. No problem. The
chip never even gets warm on the strongest signals. This is with 12v
applied to the 2822.
Hi, Tim.

This is consistent with what''s been reported, that some WX chips seem fine while a few suffer early failure.