Date   
Re: Frequency Increment thoughts...

Jack, W8TEE
 

I like the suction cup idea, as I want to be able to take this out in the field...literally...and don't want the extra weight. Still, trying to get suction on a rock might be tough...

Jack, W8TEE



From: Craig Thibodeaux <km4yec@...>
To: BITX20@groups.io
Sent: Thursday, January 18, 2018 11:30 AM
Subject: Re: [BITX20] Frequency Increment thoughts...

"µBITX doesn't have enough mass to withstand the press without holding the case."

When I toured the Kirby vacuum plant in the early eighties, I was made aware of a manufacturing ‘trick’ that has all but disappeared, that might come in handy for some of us.  That ‘trick’ was to make items heavier than necessary to imply a sense of worth was equivalent to weight.  The thinking was if two irons or two vacuums were placed side by side and then lifted individually by a homemaker (notice how politically correct I can be), the homemaker would likely choose the heavier of each as the higher quality.  Of course homemakers are better informed today, so weight where not needed is eliminated.

Jack, 

Add a lead bar, like used for melting to make fishing sinkers to weight down that chassis enough so you can push against the front panel.  Just another choice. Or throw in a couple of old transformers for fun and mass.

Or put a suction cup on the bottom of the case…...


Craig
KM4YEC






On Jan 18, 2018, at 10:43 AM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:

You could place the switch further away from the tuning knob. The problem with using the encoder switch for something used frequently is that the µBITX doesn't have enough mass to withstand the press without holding the case. (I'm using a light-weight case, but with rubber feet.) That's why I'm putting the CW message switches on the top of the case, since pushing down on a NO switch causes no problems.

I'll play around with that and see how it works...

Jack, W8TEE



From: RCBoatGuy via Groups.Io <ijnfan-HamRadio@...>
To: BITX20@groups.io 
Sent: Thursday, January 18, 2018 10:25 AM
Subject: Re: [BITX20] CW Key Switching Characteristics

I love your idea, Jack, only my personal preferences are slightly different.  If it were me, I'd have the separate NO switch be the Band switch and use the encoder switch as the tuning select (fine/medium/coarse). 

My thought is that with my clumsy fingers I might accidentally activate the encoder switch while tuning, and switching the tuning rate when that happens would be a lot less annoying that switching bands.  ;-)

73,

Carl,  K0MWC





Re: Frequency Increment thoughts...

 

"µBITX doesn't have enough mass to withstand the press without holding the case."

When I toured the Kirby vacuum plant in the early eighties, I was made aware of a manufacturing ‘trick’ that has all but disappeared, that might come in handy for some of us.  That ‘trick’ was to make items heavier than necessary to imply a sense of worth was equivalent to weight.  The thinking was if two irons or two vacuums were placed side by side and then lifted individually by a homemaker (notice how politically correct I can be), the homemaker would likely choose the heavier of each as the higher quality.  Of course homemakers are better informed today, so weight where not needed is eliminated.

Jack, 

Add a lead bar, like used for melting to make fishing sinkers to weight down that chassis enough so you can push against the front panel.  Just another choice. Or throw in a couple of old transformers for fun and mass.

Or put a suction cup on the bottom of the case…...


Craig
KM4YEC






On Jan 18, 2018, at 10:43 AM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:

You could place the switch further away from the tuning knob. The problem with using the encoder switch for something used frequently is that the µBITX doesn't have enough mass to withstand the press without holding the case. (I'm using a light-weight case, but with rubber feet.) That's why I'm putting the CW message switches on the top of the case, since pushing down on a NO switch causes no problems.

I'll play around with that and see how it works...

Jack, W8TEE



From: RCBoatGuy via Groups.Io <ijnfan-HamRadio@...>
To: BITX20@groups.io 
Sent: Thursday, January 18, 2018 10:25 AM
Subject: Re: [BITX20] CW Key Switching Characteristics

I love your idea, Jack, only my personal preferences are slightly different.  If it were me, I'd have the separate NO switch be the Band switch and use the encoder switch as the tuning select (fine/medium/coarse). 

My thought is that with my clumsy fingers I might accidentally activate the encoder switch while tuning, and switching the tuning rate when that happens would be a lot less annoying that switching bands.  ;-)

73,

Carl,  K0MWC



Re: CW Key Switching Characteristics

Rod Davis
 

Jack,

I support the NO Push button notion.

I have already wired one up on my ubitx unused digital input, but have not gotten around to implementing it.

Probably the cleaner, more reliable approach.

Rod KM6SN



On 01/18/2018 06:46 AM, Jack Purdum via Groups.Io wrote:
All:

Like everyone else, I'm doing some code mods to the software, too. I'm struggling with the implementation of the frequency increment, not from the coding aspects, but from the way to implement it. As much as I hate to do it, I'm starting to think that a NO push button switch right next to the tuning knob might be the way to go. It would respond to, say, three presses: 1) fine (e.g.,10Hz), 2) medium (200 Hz), 3) coarse (100KHz). These increments would be #define'd at the top of the source code and, hence, easily changed by a non-programmer. Or, I can move those increments to my Setup code and allow the user to change them there. (Like most "stable" variables, these are written to EEPROM and read on program startup.) The additional switch would leave the encoder-press free for other uses (e.g., band switching).

Your thoughts?

Jack, W8TEE



From: Dave Bottom <ars.kd6az@...>
To: BITX20@groups.io
Sent: Thursday, January 18, 2018 4:23 AM
Subject: Re: [BITX20] CW Key Switching Characteristics

Dennis,

uBITX already supports both a straight key and a paddle.  

Ian, KD8CEC's firmware upgrade (v0.27) fixes most of the Keying issues (along with many other improvements).

That along with Jim, W0EB's CW Keying adapter that takes care of inconsistent keying issues from changes in contact resistance (resistors from the Keying Line to ground determine Paddle dot/dash or Straight key operation.  
QRPGuys have already made a PCB available for the CW Keying Adapter (it's nice I have a couple of them already).  I've installed two jacks, one for  the straight key and one for the paddle, so they both work anytime without any menu selections.

A couple of other firmware upgrades that would be nice, and hopefully Ian may have these coming? down the road: 
1) Selecting tuning step size (on the fly - like short press on the tuning knob encoder steps through tuning step sizes in the normal operating mode and long press takes you to the regular Menu) 50 Hz is a pretty course tuning step size for SSB, and it would be nice to change this easily for moving from the CW portion of the band to the phone portion
2) Displaying the current BFO frequency setting before making BFO setting adjustments.  Now it always starts at 11.995.0 as default.

Dave WI6R

On Wed, Jan 17, 2018 at 10:11 AM, Dennis Zabawa <kg4rul@...> wrote:
I am not a CW operator but, am an experienced programmer and would like to incorporate provisions for straight key and paddles into my upgraded, Raduino equivalent design.  I plan to use an Arduino MEGA 2650 for the CPU so I have lots of digital pins available to use for key. 

I will provide a TRS jack for key with Dots from left paddle (tip of jack), Dashes from right paddle (ring of jack) and common to sleeve of jack.  A straight key will connect from tip of jack to sleeve.

Are my connections correct?

Does anyone know how much contact bounce is usually encountered with paddles or a straight key?



--
73 Dave WI6R



Virus-free. www.avast.com

Re: For anyone ordering in Canada, Import Taxes! #ubitx

Ken
 

Hi Greggory

DHL collects an import fee from you. My ubitx came by snail mail and no other costs to me.

73
Ken VA3ABN

On Thu, Jan 18, 2018 at 10:25 AM, Ghericoan <boakawizkid@...> wrote:
Just a heads up, I was dinged nearly $40 due to customs duties. For some reason the ubitx is getting marked as a "signal generator" and not as amateur radio gear when traveling through DHL.

A fellow redditor suggested that I post this here.
--
----------
N5WLF, Greggory (or my nickname, Ghericoan)
General Class, Digital Radio Hobbyist


Re: Rugged Case Options? #ubitx

Jim Sheldon
 

Here's the schematic for the BCB filter I use.  The filter is symmetrical so it doesn't matter which end you use for input or output.  I don't know who designed it but it WORKS and with the listed component values it does not get warm or pop capacitors so I suspect it's pretty rugged.

Jim - W0EB


------ Original Message ------
From: "Jim Richard" <jimk1uqi@...>
Sent: 1/18/2018 9:08:30 AM
Subject: Re: [BITX20] Rugged Case Options? #ubitx

Awesome job!!! Noticed the BCB filter, which I desperately need to add. Could you please share the details for it? 

Re: Frequency Increment thoughts...

Jack, W8TEE
 

You could place the switch further away from the tuning knob. The problem with using the encoder switch for something used frequently is that the µBITX doesn't have enough mass to withstand the press without holding the case. (I'm using a light-weight case, but with rubber feet.) That's why I'm putting the CW message switches on the top of the case, since pushing down on a NO switch causes no problems.

I'll play around with that and see how it works...

Jack, W8TEE



From: RCBoatGuy via Groups.Io <ijnfan-HamRadio@...>
To: BITX20@groups.io
Sent: Thursday, January 18, 2018 10:25 AM
Subject: Re: [BITX20] CW Key Switching Characteristics

I love your idea, Jack, only my personal preferences are slightly different.  If it were me, I'd have the separate NO switch be the Band switch and use the encoder switch as the tuning select (fine/medium/coarse). 

My thought is that with my clumsy fingers I might accidentally activate the encoder switch while tuning, and switching the tuning rate when that happens would be a lot less annoying that switching bands.  ;-)

73,

Carl,  K0MWC


Re: Rugged Case Options? #ubitx

Jack, W8TEE
 

Attached is an article for a BCI filter. I have also built it for QRP work using axial inductors. It knocked the slats out of my BCI with very little insertion loss. Here's a picture of the QRP version:

Inline image

It cost less than a $1 for me to build. (I was experimenting with Chuck Adams' Muppet builds at the time.)


Jack, W8TEE



From: Jim Richard <jimk1uqi@...>
To: BITX20@groups.io
Sent: Thursday, January 18, 2018 10:08 AM
Subject: Re: [BITX20] Rugged Case Options? #ubitx

Awesome job!!! Noticed the BCB filter, which I desperately need to add. Could you please share the details for it? 


Re: Micro BITX Order UPDATE

Arvo W0VRA
 

My order was the 15th.

Waiting for the BITX40 last summer, waiting for the µB, waiting for parts from China, all very good character building exercises.

Re: CW Key Switching Characteristics

RCBoatGuy
 

I love your idea, Jack, only my personal preferences are slightly different.  If it were me, I'd have the separate NO switch be the Band switch and use the encoder switch as the tuning select (fine/medium/coarse). 

My thought is that with my clumsy fingers I might accidentally activate the encoder switch while tuning, and switching the tuning rate when that happens would be a lot less annoying that switching bands.  ;-)

73,

Carl,  K0MWC

For anyone ordering in Canada, Import Taxes! #ubitx

Ghericoan
 

Just a heads up, I was dinged nearly $40 due to customs duties. For some reason the ubitx is getting marked as a "signal generator" and not as amateur radio gear when traveling through DHL.

A fellow redditor suggested that I post this here.
--
----------
N5WLF, Greggory (or my nickname, Ghericoan)
General Class, Digital Radio Hobbyist

Re: preorder question #ubitx

Scott Docter
 

Gordon,

How are you hooking the Signalink to your ubitx for Winlink? 

I can get WSJT-X to work using the Signalink as a soundcard. Signalink connected to laptop via usb and two audio cables connected from the Signalink to the 3.5 mm mic and speaker jacks on the ubitx. I also have WSJT-X setup to have cat control using a usb cable to the ubitx.

On Winlink I use the same setup and Winlink will change the frequency, but I can't get it to put the ubitx into transmit mode.

Thanks, Scott KC8IFH

On Tue, Jan 16, 2018 at 9:03 AM, Gordon Gibby <ggibby@...> wrote:

Bert -- 


I use this all the time to do WINLINK checkins, using either a signalink or a homebrew soundcard interface.

I have also done ALE with it.   

It could easily be a low-power emergency RMS server

With an amplifier, it would be a GREAT rms server.

​It does need some additions --- there are people on the bitx20 forum providing schematics for "pop-reduction" and "AGC" and on and on.....

In *MY* opinion it also needs protection for the B-E junction of one of the input transistors but there is disagreement on that.   



gordon




From: BITX20@groups.io <BITX20@groups.io> on behalf of Bert N8NN <bertgarcia73@...>
Sent: Tuesday, January 16, 2018 8:54 AM
To: BITX20@groups.io
Subject: Re: [BITX20] preorder question #ubitx
 
Ordered mine Dec 13 for $109.  Received Jan 15.  I'm delighted!

Bert N8NN


Re: Mica Cap replacements for WA2EBY Filter?

freefuel@...
 

Hi Mark, I have started to build up two filter boards for this amp, one with mica caps I was lucky enough to find at a local surplus outlet, and another with SMT parts. I'll post the results as soon as I test them. 

-Justin N2TOH 

Re: Rugged Case Options? #ubitx

Jim Richard
 

Awesome job!!! Noticed the BCB filter, which I desperately need to add. Could you please share the details for it? 

Re: Programming Raduino help

Allard PE1NWL
 

Oops, sorry, I meant line 2334 of course


For troubleshooting, can you please temporarily comment out line 2324 and try again?

2332   // attach interrupt to the PTT_SENSE input
2333   // when PTT_SENSE goes from LOW to HIGH (so when PTT is keyed), execute the ISRptt routine
2334   attachPCINT(digitalPinToPCINT(PTT_SENSE), ISRptt, RISING);

Re: Programming Raduino help

Allard PE1NWL
 

Hi Vic,

For troubleshooting, can you please temporarily comment out line 2324 and try again?

2332   // attach interrupt to the PTT_SENSE input
2333   // when PTT_SENSE goes from LOW to HIGH (so when PTT is keyed), execute the ISRptt routine
2334   attachPCINT(digitalPinToPCINT(PTT_SENSE), ISRptt, RISING);

Background: Perhaps the interrupt is triggered by noise, so I want to know what happens when we temporarily remove the interrupt from the code.
(If it is triggered by noise then it may disrupt the tuning mechanism)
Older versions did not use the interrupt so it would explain why it still works OK on the OEM sketch 1.01

73 Allard PE1NWL

Re: CW Key Switching Characteristics

Jack, W8TEE
 

All:

Like everyone else, I'm doing some code mods to the software, too. I'm struggling with the implementation of the frequency increment, not from the coding aspects, but from the way to implement it. As much as I hate to do it, I'm starting to think that a NO push button switch right next to the tuning knob might be the way to go. It would respond to, say, three presses: 1) fine (e.g.,10Hz), 2) medium (200 Hz), 3) coarse (100KHz). These increments would be #define'd at the top of the source code and, hence, easily changed by a non-programmer. Or, I can move those increments to my Setup code and allow the user to change them there. (Like most "stable" variables, these are written to EEPROM and read on program startup.) The additional switch would leave the encoder-press free for other uses (e.g., band switching).

Your thoughts?

Jack, W8TEE



From: Dave Bottom <ars.kd6az@...>
To: BITX20@groups.io
Sent: Thursday, January 18, 2018 4:23 AM
Subject: Re: [BITX20] CW Key Switching Characteristics

Dennis,

uBITX already supports both a straight key and a paddle.  

Ian, KD8CEC's firmware upgrade (v0.27) fixes most of the Keying issues (along with many other improvements).

That along with Jim, W0EB's CW Keying adapter that takes care of inconsistent keying issues from changes in contact resistance (resistors from the Keying Line to ground determine Paddle dot/dash or Straight key operation.  
QRPGuys have already made a PCB available for the CW Keying Adapter (it's nice I have a couple of them already).  I've installed two jacks, one for  the straight key and one for the paddle, so they both work anytime without any menu selections.

A couple of other firmware upgrades that would be nice, and hopefully Ian may have these coming? down the road: 
1) Selecting tuning step size (on the fly - like short press on the tuning knob encoder steps through tuning step sizes in the normal operating mode and long press takes you to the regular Menu) 50 Hz is a pretty course tuning step size for SSB, and it would be nice to change this easily for moving from the CW portion of the band to the phone portion
2) Displaying the current BFO frequency setting before making BFO setting adjustments.  Now it always starts at 11.995.0 as default.

Dave WI6R

On Wed, Jan 17, 2018 at 10:11 AM, Dennis Zabawa <kg4rul@...> wrote:
I am not a CW operator but, am an experienced programmer and would like to incorporate provisions for straight key and paddles into my upgraded, Raduino equivalent design.  I plan to use an Arduino MEGA 2650 for the CPU so I have lots of digital pins available to use for key. 

I will provide a TRS jack for key with Dots from left paddle (tip of jack), Dashes from right paddle (ring of jack) and common to sleeve of jack.  A straight key will connect from tip of jack to sleeve.

Are my connections correct?

Does anyone know how much contact bounce is usually encountered with paddles or a straight key?



--
73 Dave WI6R



Virus-free. www.avast.com

Re: Programming Raduino help

Vic WA4THR
 

The only mods I have made so far to the OEM board are to replace Q13 (bad transistor) with a 2N2222A and to add the back-to-back diodes on the K1 line to prevent future problems with Q13. I am just connecting the orange A3 line to ground to simulate a function switch for now.

Interesting exercise to see what happens with various parts powered differently. So I reloaded the 1.27.6 sketch, powered only by the USB, and it seemed to tune OK. Disconnecting the USB I tried the full rig connected to an antenna, and tuning was very erratic. Sometimes the frequency would change when the pot was adjusted, sometimes not. I powered down and disconnected the power lines to the BitX and the PA, so only the Raduino had power, then powered up again. Adjusting the pot made no change to the frequency at all...that surprised me!

Back to the OEM 1.01 sketch and tuning is normal.

=Vic=

Re: irf520 vs irf510

Tim Gorman
 

I forgot the attachment!

tim ab0wr

On Thu, 18 Jan 2018 01:50:58 -0600
"K9HZ" <@Doc_Bill> wrote:

Thats great Dave. I have not followed through myself by testing each
of the stages before the PA and recording the drive levels but it
should be enlightening. Ive been focused on the antenna tuner.

Ive thought through the AGC problem and i think there is a very good
solution to replace one of the early IF amplifiers with a rebiased
dual gate fet... and let the second gate be voltage controlled by the
AGC circuit. AGC should have an RF and Audio components in
logarithmic function with a low pass filter. That takes it to almost
late Collins 75A4 level.


Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ
PJ2/K9HZ
Owner - Operator
Big Signal Ranch – K9ZC
Staunton, Illinois

Owner – Operator
Villa Grand Piton - J68HZ
Soufriere, St. Lucia W.I.
Rent it: www.VillaGrandPiton.com

email: @Doc_Bill

Re: #ubitx and 6 meters #ubitx

M Garza <mgarza896@...>
 

Hi Tom,
I didn't get a chance to try it out.  It might not be until the weekend, but I will report back.

Marco - KG5PRT 

On Jan 17, 2018 9:07 PM, "Tom Christian" <tmchristian@...> wrote:
Thanks, Marco! I'll be curious to see what you find.
Tom
AB7WT

Re: irf520 vs irf510

Tim Gorman
 

You may not need such drastic surgery.

Attached is a cobbled up template using side 2 of the 2822 and a pnp
transistor to generate a control voltage. By lifting R10 and R11 and
feeding this control voltage to Q10 as its bias voltage you can control
the gain of the amp section. Or you could use Q30 instead.

I left off the biasing of the 2822 and the values of the RC filter after
the diode, those values would impact the attack and release timing. The
pot in the collector lead of the PNP transistor would be used to set the
control level being sent to Q1. All this would have to be calculated.

You could even tap into the output of Q32 instead of tapping the audio
line. But you would have to use a different AGC amplifier section.

Something to think about. Simple and easy to build and easy to reverse.

tim ab0wr

On Thu, 18 Jan 2018 01:50:58 -0600
"K9HZ" <@Doc_Bill> wrote:

Thats great Dave. I have not followed through myself by testing each
of the stages before the PA and recording the drive levels but it
should be enlightening. Ive been focused on the antenna tuner.

Ive thought through the AGC problem and i think there is a very good
solution to replace one of the early IF amplifiers with a rebiased
dual gate fet... and let the second gate be voltage controlled by the
AGC circuit. AGC should have an RF and Audio components in
logarithmic function with a low pass filter. That takes it to almost
late Collins 75A4 level.


Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ
PJ2/K9HZ
Owner - Operator
Big Signal Ranch – K9ZC
Staunton, Illinois

Owner – Operator
Villa Grand Piton - J68HZ
Soufriere, St. Lucia W.I.
Rent it: www.VillaGrandPiton.com

email: @Doc_Bill