Date   
Re: V5 reprogram.

Matt 9V1MH/VK3AMH/YF2AAH
 

The original firmware for all versions is available at groups.io

Re: Help with Audio Chain - M1 and M2 Are Ground? #ubitx-help #v6 #v5 #v4 #audiocircuit

Don, ND6T
 

Hah! I forgot to include the relay. Also I meant to say "source and gate" but wrote "source and drain"!  So yes,  I guess I shoulda stayed at Holiday In Express last night!

Re: Help with Audio Chain - M1 and M2 Are Ground? #ubitx-help #v6 #v5 #v4 #audiocircuit

AndyH
 

Crud.  There's an M1/M2 flag on the T/R relay, K3, as well as the M1-M4 flags to ground on the top of schematic.  I guess that's how the signal jumps the M1 to M2 flags.  Sorry for the noise, folks.

Don - thanks again for your walk through - it helped me see how the pop fix works.  Now...maybe...finally...I can get on with my scratch built V3 V4 V5 V6 radio. LOL

Best to the group,
Andy

Re: IRF510 insulation question #v5

Rick Green
 

On Tue, 21 Jan 2020, Don - KM4UDX wrote:

So I got the ceramic insulators.  The included bushing fits the screw just fine.  And the screw, without the bushing fits the wafer just fine. But put the bushing on the screw, and ain't
nothing going in the ceramic hole...
It looks to me like it was intended to be assembled thus:

1) Enlarge the hole in the heat sink to accomodate the bushing.
2) Insert the screw in the bushing, and the bushing in the BACK of the heat sink.
3) Place the wafer over the screw on the front of the heat sink.
4) Install the IRF510 on the screw protruding from the wafer.
5) Secure the entire stack with a lockwasher and nut.

This will insulate the IRF510 from the heat sink, but the screw head on the back will still be at the same potential as the IRF510 tab. At least, its a much smaller target for a distracted errant screwdriver ;-)

Rick Green


They are (relatively) thicker than thin silicon wafers/pads. Which would not be a problem if...
The hole were not too small for the insulating bushing. Which would not be a problem if...
The ceramic material were not so hard and brittle that I couldn't drill or sand/grind it bigger. Which wouldn't be a problem if...
I didn't want the heat sink and screw electrically isolated from the IFR510 case.  Which wouldn't be a problem if...
I could return them. Which as a practical matter I can't.  Does anyone want a few of these to play with? 
hahah.[IMAGE]
--
Rick Green

We, the People of the United States of America, reject the U.S. Supreme Court's
Citizens United ruling, and move to amend our Constitution to firmly establish
that money is not speech, and that human beings, not corporations, are persons
entitled to constitutional rights.

http://www.MoveToAmend.org

Re: Help with Audio Chain - M1 and M2 Are Ground? #ubitx-help #v6 #v5 #v4 #audiocircuit

AndyH
 

Hi Don,

   I appreciate the walk through!  Ultimately, I'm finding that I'm unable to trace the audio signal because it appears to go to flag M1, while the input for the final amp seems to have to come from flag M2.  What I don't understand is how the signal jumps from flag to flag, since the schematic says that flags M1, M2, M3, and M4 go to ground.  I figure I must be missing something simple (mostly 'cause I'm not an EE and didn't stay in a Holiday Inn Express last night :) ).

73, Andy

   


On Tue, Jan 21, 2020 at 03:40 PM, Don, ND6T wrote:
Andy,
Perhaps you're thinking of the MOSFET as being like a vacuum tube (Fleming valve) and requiring a bias voltage at the drain (corresponding to a tube plate). It does not.
Consider the device to be a resistor between the source and drain terminals and the resistance of that is controlled by the gate terminal. The important bias in a MOSFET is the voltage between source and drain only.
The drain isn't grounded directly. Rather it is connected through the body of the volume control. No DC voltage but the audio is still there.
So just concentrate upon the audio signal, instead. It passes from the pre-amplifier (Q70 collector) through a DC blocking capacitor (C51), through  R70 (which allows some side-tone audio to survive muting) and is applied to the volume control (RV4) which selects how much audio signal is to be applied to the input of the audio output amplifier (U1).
If the gate of Q74 is turned on by a positive bias then it presents a short circuit to that audio stream, routing it right to ground and reducing it so that effectively nothing reaches the volume control (except for side-tone, if it's there).
Does that help?
73,
Don

Re: Help with Audio Chain - M1 and M2 Are Ground? #ubitx-help #v6 #v5 #v4 #audiocircuit

Don, ND6T
 

Andy,
Perhaps you're thinking of the MOSFET as being like a vacuum tube (Fleming valve) and requiring a bias voltage at the drain (corresponding to a tube plate). It does not.
Consider the device to be a resistor between the source and drain terminals and the resistance of that is controlled by the gate terminal. The important bias in a MOSFET is the voltage between source and drain only.
The drain isn't grounded directly. Rather it is connected through the body of the volume control. No DC voltage but the audio is still there.
So just concentrate upon the audio signal, instead. It passes from the pre-amplifier (Q70 collector) through a DC blocking capacitor (C51), through  R70 (which allows some side-tone audio to survive muting) and is applied to the volume control (RV4) which selects how much audio signal is to be applied to the input of the audio output amplifier (U1).
If the gate of Q74 is turned on by a positive bias then it presents a short circuit to that audio stream, routing it right to ground and reducing it so that effectively nothing reaches the volume control (except for side-tone, if it's there).
Does that help?
73,
Don

Re: IRF510 insulation question #v5

Don - KM4UDX
 

So I got the ceramic insulators.  The included bushing fits the screw just fine.  And the screw, without the bushing fits the wafer just fine. But put the bushing on the screw, and ain't nothing going in the ceramic hole...

They are (relatively) thicker than thin silicon wafers/pads. Which would not be a problem if...

The hole were not too small for the insulating bushing. Which would not be a problem if...

The ceramic material were not so hard and brittle that I couldn't drill or sand/grind it bigger. Which wouldn't be a problem if...

I didn't want the heat sink and screw electrically isolated from the IFR510 case.  Which wouldn't be a problem if...

I could return them. Which as a practical matter I can't.  Does anyone want a few of these to play with? 

hahah.

Re: Help with Audio Chain - M1 and M2 Are Ground? #ubitx-help #v6 #v5 #v4 #audiocircuit

AndyH
 

Put another way, maybe:  I can't figure out how the audio signal makes the trip from the audio pre-amp to the LM386 final amp.


On Tue, Jan 21, 2020 at 12:26 PM, AndyH wrote:
I'm trying to understand the flow of the signal through the audio amp and pop-fix FET (Q74 in at least the V6).  I *think* I get that in the amplifier stage around Q70 (V6) has a bypass cap to ground, as indicated by flag M1.  The 2N7000 Q74 (V6) appears to have both terminals 2 and 3 grounded (pin 3 via flag M2).  Is that correct?  Am I reading the schematic correctly that flags M1 through M4 are ground?  If so, it appears that grounds the CW tone input and VOL-H via the 1K resistor R70.  

Thanks!
Andy  KG5RKP

Re: : #V6 software issues help please #v6

AndyH
 

I can't speak to the rest from the vantage point of my modded V3, but it appears that item 1 has been and/or is being worked.  Ashhar reported it on Christmas day, 2019.

https://groups.io/g/BITX20/message/74007


On Tue, Jan 21, 2020 at 02:33 PM, Neil k8it wrote:


 

Begin forwarded message:

From: Neil Sablatzky <k8it@...>
Date: January 21, 2020 at 3:26:58 PM EST
To: farhanbox@...
Subject: #V6 software issues help please

Asher
With help from an experienced uBitX builder we just finished putting together a V6 complete kit. I am very disappointed.
I would appreciate your help to resolve these issues ASAP.

1. No 17M band
2. Lag time on CW it is almost impossible to operate CW with either a straight key or a iambic panel since it takes about 1.5 seconds to respond.

3. No side tone volume adjustment can this be added in software? Or what is the best way to add this?

4. Mounting of display standoffs shorted to metal case. We fixed this by ordering nylon standoffs. The dimensions of the case seems off.
5. Unknown calibration numbers for 10MHz, set frequently , set BFO values. Please add a function to read back the calibration values so they can be recorded.
6. why does the LSB button stay  lit when Cw button is pushed?
7. You had indicated that you would add Morse code feedback for selections and frequency . I am completely blind and had the help of two others in building this radio. When will this update be available? It was stated on the blind hams net that you would have this ready this month.

Thanks
73 Neil k8it








: #V6 software issues help please #v6

Neil k8it
 




Begin forwarded message:

From: Neil Sablatzky <k8it@...>
Date: January 21, 2020 at 3:26:58 PM EST
To: farhanbox@...
Subject: #V6 software issues help please

Asher
With help from an experienced uBitX builder we just finished putting together a V6 complete kit. I am very disappointed.
I would appreciate your help to resolve these issues ASAP.

1. No 17M band
2. Lag time on CW it is almost impossible to operate CW with either a straight key or a iambic panel since it takes about 1.5 seconds to respond.

3. No side tone volume adjustment can this be added in software? Or what is the best way to add this?

4. Mounting of display standoffs shorted to metal case. We fixed this by ordering nylon standoffs. The dimensions of the case seems off.
5. Unknown calibration numbers for 10MHz, set frequently , set BFO values. Please add a function to read back the calibration values so they can be recorded.
6. why does the LSB button stay  lit when Cw button is pushed?
7. You had indicated that you would add Morse code feedback for selections and frequency . I am completely blind and had the help of two others in building this radio. When will this update be available? It was stated on the blind hams net that you would have this ready this month.

Thanks
73 Neil k8it








Re: STM32F769-FT8-Transceiver

Art Olson
 

Charlie



Hello again. I finally got back on this project and am a bit puzzled as to
which board stack on the headers. I ordered the adafruit proto board and it
can be stacked with the nano or with the F769 board. However I can’t seem to
find a way to stack all three together – maybe its just me. I have your
latest release with the proto board showing the jumpers soldered. But
haven’t found anything that shows the boards stacked or the backside of the
f769 display. So my question is – which boards stack together?



73

Art N2AJO



From: BITX20@groups.io <BITX20@groups.io> On Behalf Of Charles Hill
Sent: Monday, December 9, 2019 8:32 AM
To: BITX20@groups.io
Subject: [BITX20] STM32F769-FT8-Transceiver



Well I finally gotten the
<https://github.com/chillmf/STM32F769-FT8-Transceiver>
STM32F769-FT8-Transceiver project to a state worth releasing.

I have placed the files required for making the project on Github at this
location: <https://github.com/chillmf/STM32F769-FT8-Transceiver>
https://github.com/chillmf/STM32F769-FT8-Transceiver

I hope you enjoy the project.

Regards,

Charley

Re: Knob "Momentum" #ubitx #v6

Mick
 

Reed,
for fast tune I was referring to the fast tune mode when selecting VFO twice. The accelerated tuning feature is also  very nice. At very slow speeds more precise tuning is possible, as you speed up dialling the tuning incremental jumps are Appropriate and intuative.
I’m having fun playing with the changes
73 
Mick VA3EPM 

Help with Audio Chain - M1 and M2 Are Ground? #ubitx-help #v6 #v5 #v4 #audiocircuit

AndyH
 

I'm trying to understand the flow of the signal through the audio amp and pop-fix FET (Q74 in at least the V6).  I *think* I get that in the amplifier stage around Q70 (V6) has a bypass cap to ground, as indicated by flag M1.  The 2N7000 Q74 (V6) appears to have both terminals 2 and 3 grounded (pin 3 via flag M2).  Is that correct?  Am I reading the schematic correctly that flags M1 through M4 are ground?  If so, it appears that grounds the CW tone input and VOL-H via the 1K resistor R70.  

Thanks!
Andy  KG5RKP

Re: Knob "Momentum" #ubitx #v6

Andy_501
 

Thanks Reed

I have ordered in a new pencil iron with variable heat control and a number of varied selection of tips so won't be at this for a bit I want to add the extra morse jack for a straight key as has been suggested.

My whole thrust on this project was to be able to do straight key cw primarily.

I haven't looked closely at it, but am hoping the Morse key input option uses a different method to turn on the TX indicator without causing a cw rf o/p  lag as it does when keyed from PTT in CW mode.

I have a couple of audio clips att here if of any use to others to check BW and linearity spectrum. They are set to levels of just under 32 mv or about 70% of the max mic audio input level; 1. 300Hz, 2. 3000 Hz 3. 2-tone 700Hz/1900 Hz

I will respond wrt to freq step changes when I can squeeze in some time to get it uploaded and tested.

cheers & 73

Andy_501


On 2020-01-21 3:50 a.m., Reed N wrote:
My latest improvement effort is to make the knob dynamically change its step size, so when you're tuning fast, it goes fast, but when you're trying to get the exact right frequency, it will let you. There's a lot of subjectivity in this, so it's more of an art than a science (though there is some science to be had).

https://github.com/reedbn/ubitxv6/tree/knob-acceleration

Joel (N6ALT) - I'd appreciate it if you could take it for a spin, since you seem generally up for some adventure.
Mark/Smitty - I'd also appreciate your feedback, since it's building off of your work with the interrupts.
Andy_501 - I've dropped the increments on the settings menus (among others, the local oscillator cal), so you may be interested in trying it out for that reason. I've attached a hex, since I don't think you've had success compiling?


Reed

Re: UBITX6 arrived today - cracked display

George P Linehan III
 

Thomas all OK here tnx

On Jan 21, 2020, at 4:05 AM, support@... wrote:

Hi Paul,
Please do send in a mail to support@... along with an image of the broken part and we can send you a replacement part soon.

We are sorry that it has reached you with the display cracked during shipping. We do carefully check the parts before shipping and we dont know how this happened.

Thanks,

Thomas

Re: Knob "Momentum" #ubitx #v6

MONEYSMITH
 

I USE A SPINNER KNOB ON MY VER 6 TRANSCEIVER AVAILABLE ON EBAY.

NEW-Universal-Spinner-Knob-for-Radio-Amplifier-Alcoknob-K91182F-185345

This is a NEW, Alcoknob part # K-91182F Machined Aluminum, Black Spinner Knob.

This knob is a designed to fit on a standard 1/4" shaft, control device (potentiometer, tuner, etc.) on a Radio, Amplifier, or Testing Equipment.

This knob is New Old Stock (N.O.S.) from a bulk case, with no retail packaging.

Can be used as upgraded tuning knob for the Eton E1-XM, as well as some other radio receivers.

Features:

  • Machined Aluminum Construction
  • Black Anodized, 3 Flute Body Design
  • Fits standard 1/4" shaft devices
  • Set Screw Attachment
  • 1.25" Diameter x 1.25" Total Height

On 1/21/2020 9:53 AM, Reed N wrote:
Hi Mick,

4) When you say "fast tune" do you mean the "fast tune"mode when the VFO is selected twice, or the rapid acceleration you get when spinning the knob quickly?

5) The font is slightly smaller (both in code, and in number of pixels), but I tried to keep the original look fairly similar.

6) You're spot on about the flickering. At some point I hope to address that to the extent possible.


Reed

Re: Knob "Momentum" #ubitx #v6

Reed N
 

Hi Mick,

4) When you say "fast tune" do you mean the "fast tune"mode when the VFO is selected twice, or the rapid acceleration you get when spinning the knob quickly?

5) The font is slightly smaller (both in code, and in number of pixels), but I tried to keep the original look fairly similar.

6) You're spot on about the flickering. At some point I hope to address that to the extent possible.


Reed

Re: Knob "Momentum" #ubitx #v6

Reed N
 

I didn't actually make it run time configurable. Only compile time. Perhaps I should add a configurable setting for it... Definitely something I'll consider.


Reed

Re: Knob "Momentum" #ubitx #v6

Reed N
 

Your health definitely takes priority over radio shenanigans. I wish you a speedy recovery!


Reed

Re: Knob "Momentum" #ubitx #v6

Mick
 

Reed,
I loaded the hex file (thanks for providing it). Some comments
1) Very Nice!!
2) I like the setup routine, freq adjust resolution, and BFO save not exiting the program makes tuning much easier.
3) screen refresh is immediate
4) the tune momentum is a great improvement and the fast tune is excellent
5) it took me a minute to adjust to the change in screen resolution, once I got used to it it is a cleaner display
6) my only (slightly) negative comment was the visible screen refresh when tuning or fast tuning. I assume this is a side effect of the the fast screen refresh.
all in all very nice upgrade Thanks
73
Mick VA3EPM