Date   
Re: uBITX drive level.. #ubitx

Anders Landgren
 

Mr Kang has published his fix for low drive on his excellent blog:
http://smallwonderqrp.blogspot.se/2017/11/?m=1
73 de SM5NNO

My UbitX and modify CW keying on Mic PTT #ubitx

Mitani Masaru
 

Hi,This is JE4SMQ masa.

My ubitx contains in ORIGAMI paper case(15 cm square).
It's costs only 100JPY(about $1).
Exchange no push switch Encoder and Indipendent push switch add.

Ver1.00R Software install and modify:

1. Transmit can Japan Amateur bands only.
If offband Frequency,no PTT/CW breakin work.
Thins function requre Japan low.
2.BAND Select mode,Frequency fits Japan BAND PLAN.
3.In CW mode.
Mic PTT can keying, This is Always,Straghit key mode.
If Paddle connect,keyer can use(in menu setting).

Thank you.

Re: Case

Arv Evans
 

Great looking chassis.  It shows what can be done with a small number of tools and
a lot of ingenuity. 

Arv  K7HKL
_._


On Mon, Feb 5, 2018 at 1:06 AM, Sajeesh Pilakkat via Groups.Io <sajeeshpilakkat@...> wrote:
Dear All,

Inviting you all to have a look on uBitx Case Home brewed.

http://vu3psz.blogspot.in/2018/02/ubitx-home-brewed-enclosure.html


Re: Second batch of uBITX shipping? #ubitx

Art Howard
 


On 5 Feb 2018 6:43 am, "dj0hf" <dj0hf@...> wrote:
You couldn't make it up - My ubitx took just 24 hours to get from India to Germany with DHL and has now sat for 3 days (so far) at the customs in Leipzig and they are refusing to release it without a detailed description of exactly what is inside the package.
I've sent them a description and a link to the hfsignals web-site. So now it's just wait and see what happens. Maybe I'll get it eventually

Ian
DJ0HF/G3ULO



Re: whistles in receive

Ashhar Farhan
 

The warm smells of an HRO steaming up... is there any hotroding one can do to these rigs?
- f

On 5 Feb 2018 12:02 am, "Leland Lannoye" <wa9aoe@...> wrote:
I am sitting here reading some of this information and studying the new technology.  When I was young (at leas 50 years ago), solid state technologies were either in their infancy or still a dream.  Our rigs were two pieces of equipment, a receiver and a transmitter with a variety of accessories.

Most of our receivers for those of us who were not well heeld in the financial area were of the single conversion genre with an if frequency of 455 kHz.  With little preselection capability, this relegated the ham bands 20 mtrs and above useless with hetrodyne images from frequencies 910 kHz either above or below the desired reception point. There, in that day, were three remedies to fix this. The first two were:

    1.)  add a really selective high gain preselector to tune the offending images out

    2.)  raise the if to something on the order of 1600 kHz which left bandpass selectivity at a substantial disadvantage.

The third option, and the most expensive in its day was double (or, even triple) conversion.  If  you were able to pay the 1958 price of over $300, you were in and there were few difficulties thereafter until the receiver aged and developed some bad shield grounds or worse.  The second or third conversion local oscillator would provide a cornu copia of birdies of one type or another. These included signals that were always there, I know the newer designs with balanced mixers and the like have few of these problems, but, it is worth considering.

An aging ham from way back.


Lee, WA9AOE


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Re: My UbitX and modify CW keying on Mic PTT #ubitx

Thomas Sharka
 

if (frequency >= 28000000 && frequency <= 28000000) hambandfrequyency = true

You can only transmit on 28 Mhz?
 


Sent from Yahoo Mail. Get the app


On Monday, February 5, 2018 10:28 AM, Mitani Masaru <mitani.masaru@...> wrote:


Hi,This is JE4SMQ masa.

My ubitx contains in ORIGAMI paper case(15 cm square).
It's costs  only 100JPY(about $1).
Exchange no push switch Encoder and Indipendent push switch add.

Ver1.00R Software install and modify:

1. Transmit can Japan Amateur bands only.
If offband Frequency,no PTT/CW breakin work.
Thins function requre Japan low.
2.BAND Select mode,Frequency fits Japan BAND PLAN.
3.In CW mode.
Mic PTT can keying, This is Always,Straghit key mode.
If Paddle connect,keyer can use(in menu setting).

Thank you.




Re: My UbitX and modify CW keying on Mic PTT #ubitx

Mitani Masaru
 

It's already fixed.
Thank you.

Re: whistles in receive

Leland Lannoye
 

There have been numerous articles in QST over the years on rebuilding these old rigs.  I found an article which I saved somewhere on building transistor substitutes for the tubes.  you could build them on small perf boards and set up a set of wires that corresponded to the pin out on the tubes.  At one time, someone was making modules to replace all the low power and receiving tubes on the Collins S line.  That was at least 40 years ago.  I don't do well on a lot of these tiny connections anymore due to age and aging eyes, but my history skills are still largely intact.

Lee, WA9AOE

PS: Still awaiting shipment on my Bitx.

On 2/5/2018 10:40 AM, Ashhar Farhan wrote:
The warm smells of an HRO steaming up... is there any hotroding one can do to these rigs?
- f

On 5 Feb 2018 12:02 am, "Leland Lannoye" <wa9aoe@...> wrote:
I am sitting here reading some of this information and studying the new technology.  When I was young (at leas 50 years ago), solid state technologies were either in their infancy or still a dream.  Our rigs were two pieces of equipment, a receiver and a transmitter with a variety of accessories.

Most of our receivers for those of us who were not well heeld in the financial area were of the single conversion genre with an if frequency of 455 kHz.  With little preselection capability, this relegated the ham bands 20 mtrs and above useless with hetrodyne images from frequencies 910 kHz either above or below the desired reception point. There, in that day, were three remedies to fix this. The first two were:

    1.)  add a really selective high gain preselector to tune the offending images out

    2.)  raise the if to something on the order of 1600 kHz which left bandpass selectivity at a substantial disadvantage.

The third option, and the most expensive in its day was double (or, even triple) conversion.  If  you were able to pay the 1958 price of over $300, you were in and there were few difficulties thereafter until the receiver aged and developed some bad shield grounds or worse.  The second or third conversion local oscillator would provide a cornu copia of birdies of one type or another. These included signals that were always there, I know the newer designs with balanced mixers and the like have few of these problems, but, it is worth considering.

An aging ham from way back.


Lee, WA9AOE


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Re: Anyone (US Only for now) need a uBITX Raduino repaired? #ubitx

Christopher Miller
 

Sweet, now i just need a ubitx

Re: Second batch of uBITX shipping? #ubitx

Leland Lannoye
 

Klinkt mir, dass der Herr Walter Ulbricht beherrscht die deutsche Kontrolle jetzt! . Jawohl, Komrad!

On 2/5/2018 10:39 AM, Art Howard wrote:

On 5 Feb 2018 6:43 am, "dj0hf" <dj0hf@...> wrote:
You couldn't make it up - My ubitx took just 24 hours to get from India to Germany with DHL and has now sat for 3 days (so far) at the customs in Leipzig and they are refusing to release it without a detailed description of exactly what is inside the package.
I've sent them a description and a link to the hfsignals web-site. So now it's just wait and see what happens. Maybe I'll get it eventually

Ian
DJ0HF/G3ULO




Virus-free. www.avg.com

Re: whistles in receive

Jerry Gaffke
 

One of my earliest memories at about 3 years of age, maybe less, is being fascinated
by the console tube radio we had in the living room.
Peering around in back, face pressed against the wall, trying to see what was inside
and figure out how it worked. 
My elders teasing me, telling me about all the little people tucked inside. 

Younger hams in the states will only think of Ham Radio Outlet, our local retail chain.
Here's the real HRO:  http://www.radioblvd.com/National%20HRO.htm
And a choice quote:

The original published story for the origin of  the HRO designation related that all of National's inter-departmental paperwork for the receiver project was stamped "H.R.O." which stood for "Hellva Rush Order" since the time table for the receiver development was a "rush order" type of project. For many years this was the story related in National advertising and it sounded believable. However, after James Millen left National in 1939, he corrected the story as follows:

The original development paperwork was usually marked "H.O.R." - for "Hell Of a Rush" but during the finalization phase, someone at National decided they didn't want their new receivers to be referred to as "HORs" so the letters were rearranged and became HRO - then the "Hellva Rush Order" story created to explain the HRO designation.

Well,...that's Millen's story anyway.   


On Mon, Feb 5, 2018 at 07:40 am, Ashhar Farhan wrote:
The warm smells of an HRO steaming up... is there any hotroding one can do to these rigs?
- f
 

At long last!!

David Robertson <kd1na363@...>
 

I finally got my paypal e-mail indicating my uBITX radio is shipping. As for many others it has been a long wait. Looking forward for the DSL package at my door

73
Dave KD1NA 

Re: At long last!!

Vince Vielhaber
 

DSL? Coming via internet connection? :)

Do you recall your order date?

Vince.

On 02/05/2018 11:39 AM, David Robertson wrote:
I finally got my paypal e-mail indicating my uBITX radio is shipping. As
for many others it has been a long wait. Looking forward for the DSL
package at my door

73
Dave KD1NA

Re: At long last!!

bill richardson
 

Great news Dave.. got mine last week and it’s built in a case and firmware updated..

Good seeing you at BBQCon a few weeks ago.

73 Bill Ng1p

On Feb 5, 2018, at 11:39 AM, David Robertson <kd1na363@...> wrote:

KD1NA

Re: At long last!!

Leland Lannoye
 

Mine was December 20, 2017.

On 2/5/2018 11:46 AM, Vince Vielhaber wrote:
DSL? Coming via internet connection?  :)

Do you recall your order date?

Vince.



On 02/05/2018 11:39 AM, David Robertson wrote:
I finally got my paypal e-mail indicating my uBITX radio is shipping. As
for many others it has been a long wait. Looking forward for the DSL
package at my door

73
Dave KD1NA
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Re: Second batch of uBITX shipping? #ubitx

KK6VLV
 

Just got email about 6 hours ago with the tracking number.
I ordered on December 17. I am in USA.
Estimated delivery date from DHL website using the tracking number is Friday February 9.
--
KK6VLV

Re: whistles in receive

Jack, W8TEE
 

One can get carried away, however...

Inline image
Jack, W8TEE


From: Leland Lannoye <wa9aoe@...>
To: BITX20@groups.io
Sent: Monday, February 5, 2018 10:49 AM
Subject: Re: [BITX20] whistles in receive

There have been numerous articles in QST over the years on rebuilding these old rigs.  I found an article which I saved somewhere on building transistor substitutes for the tubes.  you could build them on small perf boards and set up a set of wires that corresponded to the pin out on the tubes.  At one time, someone was making modules to replace all the low power and receiving tubes on the Collins S line.  That was at least 40 years ago.  I don't do well on a lot of these tiny connections anymore due to age and aging eyes, but my history skills are still largely intact.
Lee, WA9AOE
PS: Still awaiting shipment on my Bitx.
On 2/5/2018 10:40 AM, Ashhar Farhan wrote:
The warm smells of an HRO steaming up... is there any hotroding one can do to these rigs?
- f

On 5 Feb 2018 12:02 am, "Leland Lannoye" <wa9aoe@...> wrote:
I am sitting here reading some of this information and studying the new technology.  When I was young (at leas 50 years ago), solid state technologies were either in their infancy or still a dream.  Our rigs were two pieces of equipment, a receiver and a transmitter with a variety of accessories.

Most of our receivers for those of us who were not well heeld in the financial area were of the single conversion genre with an if frequency of 455 kHz.  With little preselection capability, this relegated the ham bands 20 mtrs and above useless with hetrodyne images from frequencies 910 kHz either above or below the desired reception point. There, in that day, were three remedies to fix this. The first two were:

    1.)  add a really selective high gain preselector to tune the offending images out

    2.)  raise the if to something on the order of 1600 kHz which left bandpass selectivity at a substantial disadvantage.

The third option, and the most expensive in its day was double (or, even triple) conversion.  If  you were able to pay the 1958 price of over $300, you were in and there were few difficulties thereafter until the receiver aged and developed some bad shield grounds or worse.  The second or third conversion local oscillator would provide a cornu copia of birdies of one type or another. These included signals that were always there, I know the newer designs with balanced mixers and the like have few of these problems, but, it is worth considering.

An aging ham from way back.


Lee, WA9AOE


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Virus-free. www.avg.com


Re: whistles in receive

chris gress <Chrisg0wfh@...>
 

And to think I have 1 old ICOM I'm to poor for any else lol

On 5 Feb 2018 18:35, "Jack Purdum via Groups.Io" <jjpurdum=yahoo.com@groups.io> wrote:
One can get carried away, however...

Inline image
Jack, W8TEE


From: Leland Lannoye <wa9aoe@...>
To: BITX20@groups.io
Sent: Monday, February 5, 2018 10:49 AM
Subject: Re: [BITX20] whistles in receive

There have been numerous articles in QST over the years on rebuilding these old rigs.  I found an article which I saved somewhere on building transistor substitutes for the tubes.  you could build them on small perf boards and set up a set of wires that corresponded to the pin out on the tubes.  At one time, someone was making modules to replace all the low power and receiving tubes on the Collins S line.  That was at least 40 years ago.  I don't do well on a lot of these tiny connections anymore due to age and aging eyes, but my history skills are still largely intact.
Lee, WA9AOE
PS: Still awaiting shipment on my Bitx.
On 2/5/2018 10:40 AM, Ashhar Farhan wrote:
The warm smells of an HRO steaming up... is there any hotroding one can do to these rigs?
- f

On 5 Feb 2018 12:02 am, "Leland Lannoye" <wa9aoe@...> wrote:
I am sitting here reading some of this information and studying the new technology.  When I was young (at leas 50 years ago), solid state technologies were either in their infancy or still a dream.  Our rigs were two pieces of equipment, a receiver and a transmitter with a variety of accessories.

Most of our receivers for those of us who were not well heeld in the financial area were of the single conversion genre with an if frequency of 455 kHz.  With little preselection capability, this relegated the ham bands 20 mtrs and above useless with hetrodyne images from frequencies 910 kHz either above or below the desired reception point. There, in that day, were three remedies to fix this. The first two were:

    1.)  add a really selective high gain preselector to tune the offending images out

    2.)  raise the if to something on the order of 1600 kHz which left bandpass selectivity at a substantial disadvantage.

The third option, and the most expensive in its day was double (or, even triple) conversion.  If  you were able to pay the 1958 price of over $300, you were in and there were few difficulties thereafter until the receiver aged and developed some bad shield grounds or worse.  The second or third conversion local oscillator would provide a cornu copia of birdies of one type or another. These included signals that were always there, I know the newer designs with balanced mixers and the like have few of these problems, but, it is worth considering.

An aging ham from way back.


Lee, WA9AOE


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http://www.avg.com





Virus-free. www.avg.com


Re: LTSpice simulation of uBitx Power Amp

Jerry Gaffke
 

Have now uploaded version two of the simulation:
    https://groups.io/g/BITX20/files/KE7ER/WA2EBYandUBITX_2.asc
    https://groups.io/g/BITX20/files/KE7ER/WA2EBYandUBITX_2.pdf

Has the following changes:
Quiescent drain current reduced to 10ma on both.
Added a switching mechanism to show response at both 7 and 30 mhz with a single run.

Observations:

Power out on WA2EBY is still much lower at 30mhz than he reported in his QST article.
Input impedance at 30mhz falls to 12 ohms, which is the primary factor here.
If Vin source impedance is reduced from 50 ohms to 0 ohms, then 30mhz output exceeds 7mhz output.
 
Removing C3 increases output a bit at both 7 and 30mhz 

L3 helps make the exciter see a resistive load, but doesn't help much.
 
I'm moving on to other things.
Let me know if anybody figures out why my model of the WA2EBY amp shows the output to be so much lower at 30mhz
Here's my notes on how I got the WA2EBY inductor values, includes a python script for single layer coils:

# http://info.ee.surrey.ac.uk/Workshop/advice/coils/air_coils.html
#   Single layer coils, wheeler formula:  Henrys = 0.001 * N**2* R**2 / (228R + 254L)
#   where N is number of turns, R is radius in meters, L is length in meters (>0.8r)
def h(n, d, w): # turns, form diameter in inches, wire diameter in inches
   length = w*n/39.37 # length of coil in meters, assuming close wound
   radius = (d+w)/2/39.37 # radius of coil from middle of wire in meters
   henries = 0.001 * n**2* radius**2 / (228*radius + 254*length)
   return(henries)

L1, L2   9-1/2 turns #24 enameled wire, closely wound 0.25-in. ID       >>> h(9.5, 0.25,  0.02):  5.285e-07 = 0.5285uH
L3       3-1/2 turns #24 enameled wire, closely wound 0.190-in. ID      >>> h(3.5, 0.190, 0.02):  8.222e-08 = 0.0822uH
T1       10 bifilar turns #24 enameled wire on an FT-50-43 core  uH=(AL*Turns**2)/1000  AL=440     (440*100)/1000 = 44uH/winding
T2       10 bifilar turns #22 enameled wire on two stacked FT-50-43 cores. AL doubles (880*100)/1000 = 88uH/winding
T3       Pri 2 turns, sec 3 turns #20 Tefloncovered wire on BN-43-3312 balun core. AL=7000    (7000*4)/1000=28uH, (7000*9)/1000=63uH

Jerry,  KE7ER



On Sun, Feb 4, 2018 at 10:21 pm, Jerry Gaffke wrote:

I've now uploaded an LTSpice simulation schematic file that allows easy comparison of the uBitx and WA2EBY finals,
also a pdf version for those who have not installed LTSpice:
    https://groups.io/g/BITX20/files/KE7ER/WA2EBYandUBITX.asc
    https://groups.io/g/BITX20/files/KE7ER/WA2EBYandUBITX.pdf

I haven't played with it too much, haven't taken any notes.
But here's what I think I'm seeing:

The WA2EBY does perform better. 
Power in is about the same between the two, power out from the WA2EBY is generally a factor of 3 greater.
The gates on the WA2EBY have nice sine waves, the uBitx is quite distorted there by capacitive loading.
Input impedance on both is about 50 ohms at 7mhz, both go down to about 12 ohms at 30mhz,
as determined by monitoring the voltage after the 50 ohm source impedance resistor.
Both show a 4x power increase when switching from 30mhz to 7mhz, more than I would
have expected on the WA2EBY, perhaps I have some wrong values on the inductors?
The IRF510 model assumes worst case for Rds(on) and Qgate, though I doubt that's just too far off.

Jerry, KE7ER

Re: LTSpice simulation of uBitx Power Amp

Diver Martin <diver.martin@...>
 

> Let me know if anybody figures out why my model of the WA2EBY amp shows the output to be so much lower at 30mhz

To quote George E.P. Box, "All models are wrong, but some are useful."

Spice models are just that, models.  They're rarely right.  But they can tell you useful things about some of the mechanics of what's going on inside the system.

On Mon, Feb 5, 2018 at 10:40 AM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
Have now uploaded version two of the simulation:
    https://groups.io/g/BITX20/files/KE7ER/WA2EBYandUBITX_2.asc
    https://groups.io/g/BITX20/files/KE7ER/WA2EBYandUBITX_2.pdf

Has the following changes:
Quiescent drain current reduced to 10ma on both.
Added a switching mechanism to show response at both 7 and 30 mhz with a single run.

Observations:

Power out on WA2EBY is still much lower at 30mhz than he reported in his QST article.
Input impedance at 30mhz falls to 12 ohms, which is the primary factor here.
If Vin source impedance is reduced from 50 ohms to 0 ohms, then 30mhz output exceeds 7mhz output.
 
Removing C3 increases output a bit at both 7 and 30mhz 

L3 helps make the exciter see a resistive load, but doesn't help much.
 
I'm moving on to other things.
Let me know if anybody figures out why my model of the WA2EBY amp shows the output to be so much lower at 30mhz
Here's my notes on how I got the WA2EBY inductor values, includes a python script for single layer coils:

# http://info.ee.surrey.ac.uk/Workshop/advice/coils/air_coils.html
#   Single layer coils, wheeler formula:  Henrys = 0.001 * N**2* R**2 / (228R + 254L)
#   where N is number of turns, R is radius in meters, L is length in meters (>0.8r)
def h(n, d, w): # turns, form diameter in inches, wire diameter in inches
   length = w*n/39.37 # length of coil in meters, assuming close wound
   radius = (d+w)/2/39.37 # radius of coil from middle of wire in meters
   henries = 0.001 * n**2* radius**2 / (228*radius + 254*length)
   return(henries)

L1, L2   9-1/2 turns #24 enameled wire, closely wound 0.25-in. ID       >>> h(9.5, 0.25,  0.02):  5.285e-07 = 0.5285uH
L3       3-1/2 turns #24 enameled wire, closely wound 0.190-in. ID      >>> h(3.5, 0.190, 0.02):  8.222e-08 = 0.0822uH
T1       10 bifilar turns #24 enameled wire on an FT-50-43 core  uH=(AL*Turns**2)/1000  AL=440     (440*100)/1000 = 44uH/winding
T2       10 bifilar turns #22 enameled wire on two stacked FT-50-43 cores. AL doubles (880*100)/1000 = 88uH/winding
T3       Pri 2 turns, sec 3 turns #20 Tefloncovered wire on BN-43-3312 balun core. AL=7000    (7000*4)/1000=28uH, (7000*9)/1000=63uH

Jerry,  KE7ER



On Sun, Feb 4, 2018 at 10:21 pm, Jerry Gaffke wrote:

I've now uploaded an LTSpice simulation schematic file that allows easy comparison of the uBitx and WA2EBY finals,
also a pdf version for those who have not installed LTSpice:
    https://groups.io/g/BITX20/files/KE7ER/WA2EBYandUBITX.asc
    https://groups.io/g/BITX20/files/KE7ER/WA2EBYandUBITX.pdf

I haven't played with it too much, haven't taken any notes.
But here's what I think I'm seeing:

The WA2EBY does perform better. 
Power in is about the same between the two, power out from the WA2EBY is generally a factor of 3 greater.
The gates on the WA2EBY have nice sine waves, the uBitx is quite distorted there by capacitive loading.
Input impedance on both is about 50 ohms at 7mhz, both go down to about 12 ohms at 30mhz,
as determined by monitoring the voltage after the 50 ohm source impedance resistor.
Both show a 4x power increase when switching from 30mhz to 7mhz, more than I would
have expected on the WA2EBY, perhaps I have some wrong values on the inductors?
The IRF510 model assumes worst case for Rds(on) and Qgate, though I doubt that's just too far off.

Jerry, KE7ER




--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?