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Re: Push button not functioning

 

Bill

After pushing button notice rig will no longer transmit.

After pushing button, turn the encoder to see various menu selections. To choose the one displayed,? press the button again.? you pretty much have to try each one to understand what it does.

Curt
Re: AGC Pre-Oders are in and built!

 

¿ªÔÆÌåÓý

Thank you. ?Will look forward to the board.?
Dan W3BU


On Mar 4, 2019, at 10:09 PM, N8DAH <Dherron@...> wrote:

The AGC's are in and looking good. I need to finish up packing and shipping the pre-orders and then we will open the gates for the rest of them.

Install and switch wire up instructions will be included with the 1st 40, sales after that will have a download on the kit-projects site.

To those that did pre-order thank you for your support and patience, things got a little hectic in the last few weeks.

73

?

<20190304_220255.jpg>
--
David

?N8DAH
Re: DC blocking cap between souncard and ubitc mic input. #ft8 #ubitx

 

There is some discussion about a transformer at the mic input affecting the output. It works on two of my v3 rigs. There is a blocking cap c60, a 1uF on the input of the q6 the mic preamp. I would imagine that r60 could be disconnected without issue but I have not done this.
73
Dave
k0mbt
Re: Push button not functioning

Martin Potter
 

If you are sure that the button is working OK and that the wires to it are correct, be sure to check the connections at the other end -- correct pins, not loose, etc. I read somewhere that some of the connectors fitted only loosely. (I am still waiting for my uBitX to arrive.)
Good luck and 73,
... Martin VE3OAT
AGC Pre-Oders are in and built!

 

The AGC's are in and looking good. I need to finish up packing and shipping the pre-orders and then we will open the gates for the rest of them.

Install and switch wire up instructions will be included with the 1st 40, sales after that will have a download on the kit-projects site.

To those that did pre-order thank you for your support and patience, things got a little hectic in the last few weeks.

73

?


--
David

?N8DAH
Re: DC blocking cap between souncard and ubitc mic input. #ft8 #ubitx

Gordon Gibby
 

¿ªÔÆÌåÓý

Folks, this depends on what impedance it is feeding into. ?If it¡¯s feeding into a very high impedance say 100,000 ohms, then it ?will be relatively flat
?
Likely the input impedance is a little lower than that so I preferred to use a one microfarad electrolytic, with the plus side towards the DC bias voltage of the rig.

The transformer output is a dead short at DC, so that side is 0 V. ?

Gordon


On Mar 5, 2019, at 00:22, Joe Puma <kd2nfc@...> wrote:

okay got it, so it removes some of the lower boomieness of the audio spectrum since it wouldn¡¯t be heard much anyway and allow more of the mid and highs to get through. my first impression was a audio filter as I am familiar with it use in that application but its good to know its blocking DC as well. I spent a few minutes reading this very basic understanding.?


Joe



On Mar 4, 2019, at 5:11 PM, iz oos <and2oosiz2@...> wrote:

Primarily it does block DC, however it attenuates somewhat more the lower frequencies (as 300hz) than the higher (3khz).


Il 04/mar/2019 22:56, "Joe Puma" <kd2nfc@...> ha scritto:
So it¡¯s not dc blocking but a audio filter??

Joe
Kd2nfc?



On Mar 4, 2019, at 4:52 PM, iz oos <and2oosiz2@...> wrote:

0.1uF at 300hz has a reactance around 5000ohm, at 3Khz 500ohm, so it acts as a sort of audio high pass filter. If the cap has a higher capacitance the audio response is flatter.


Il 04/mar/2019 19:15, "Joe Puma" <kd2nfc@...> ha scritto:
The easydigi does have this blocking cap. .1uf

Joe
KD2NFC?


On Mar 4, 2019, at 12:05 PM, Playthatbeat Mrdj <playthatbeat303@...> wrote:

So things are actually worse when using a transformer to isolate the mic line? So things like the easy-digi etc. make things worse? this was not my experience at all. before using a transformer, i could not sustain the audio connection between my (horrible) single audio jack on my handheld PC, but after i could without issue.

So, it's possible that using easy-digi or a transformer is shunting the voltage on the mic line to ground, which could cause all manner of strange problems with the uBitx? Is this correct?





Re: tx via software

 

excellent...thanks. Working on expanding v3 nextion gui to 3.5" and want to add a tune function.
Re: tx via software

 

If your using the KD8CEC firmware you also have cat control for keying the rig for digimodes via the serial interface.
--
Tim Keller - KE2GKB
Re: tx via software

 

The key is hooked up to an Arduino input pin, nothing else sees it.
Your software can ignore that pin and transmit CW whenever it wishes.


On Mon, Mar 4, 2019 at 04:53 PM, Sam Tedesco wrote:
Before I start digging around, can anyone confirm if the rig can be keyed via software or do I have to physically short at key? Thanks
Re: Pseudo-Sine?

 

In addition to being simpler than adding a clean audio oscillator, and cleaner in that it avoids
issues with residual carrier and opposite sideband, this scheme will allow adjusting
power out by choosing an operating point on the shoulder of the 45mhz crystal filter passband.

Controlling SSB power out in this way was first proposed by VK2ETA and is now in the KD8CEC firmware.
Involves no additional hardware.? With the above change, this could now also work for CW transmit.
See posts 46235, 46241, 50215, 50265, 50279 if curious about this method of adjusting power out.

Jerry, KE7ER


On Mon, Mar 4, 2019 at 10:14 AM, Jerry Gaffke wrote:
Assuming 16dB gain in the 45mhz amp and a 45mhz signal into the D1,D2 mixer
that is at least 10db down from a 7dBm CLK2 local oscillator,
the 45mhz square wave coming out of the D3,D4 mixer should be? ?7dBm-10dB-16dB = -19dBm.
Perhaps 10dB less, as CLK2 is nowhere near 7dBm.
If we overload the 45mhz signal port going into D1,D2, we start generating harmonics again.

The D3,D4 mixer would now be getting unbalanced during CW key down by moving R104,R105
over from where they have been at D1,D2.


toggle quoted message. . .

?

On Mon, Mar 4, 2019 at 09:28 AM, Jerry Gaffke wrote:
One possibility for CW transmit would be to inject a low level keyed 45mhz square wave at CLK1,
the 45mhz crystal filter will turn that into a sine wave.
CLK2 can remain a square wave at Transmit_Freq + 45mhz, same as during SSB transmit,
the D1,D2 mixer will generate a sine wave for the power amp at the Transmit_Freq.
tx via software

 

Hi everyone,

Before I start digging around, can anyone confirm if the rig can be keyed via software or do I have to physically short at key? Thanks
Re: Push button not functioning

 

Thanks for the info on the resistors.? I thought something like that. still have the question about the push button.

Thanks? Bill K9JUI

On 3/4/2019 6:33 PM, Martin Potter wrote:
The resistors are for the Morse key. Do not discard them. See here :

73,
... Martin VE3OAT
Re: Push button not functioning

Martin Potter
 

The resistors are for the Morse key. Do not discard them. See here :

73,
... Martin VE3OAT
Re: Pseudo-Sine?

jim
 

Perhaps this article would be of some interest (Ham Radio Dec 1973)

On Monday, March 4, 2019, 1:33:41 PM PST, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:


A bandpass filter that gives flat response across all of 80m (let alone 80m+60m both)?
would be more difficult to implement than a low pass filter.
Though a bandpass filter if done well could be better, in that it would reject some spurs below the operating frequency.

Jerry


On Mon, Mar 4, 2019 at 12:24 PM, Adrian Chadd wrote:
Well, where are the harmonics showing up? :)
-adrian
?
toggle quoted mes
On Mon, 4 Mar 2019 at 12:21, jim via Groups.Io <ab7vf=[email protected]> wrote:
?
So, perhaps a dumb question or maybe two .., but "Why the continued instance on using low-pass filters ...Wouldn't some band-pass filters make more sense??
Jim
?
On Monday, March 4, 2019, 12:15:41 PM PST, Jerry Gaffke via Groups.Io <jgaffke=[email protected]> wrote:
As I said in post 66008:
> Allisons extra filters would fix that, at the cost of considerable complication.

Bandpass Filter Design.pdf
Bandpass Filter Design.pdf

Push button not functioning

 

Just received the V5.1 - works OK , Transmits, receives - But when I push the push button on the encoder?
I can not get to setup. The button seems to not work, I did measure continuity and it closed when pushed.
Measured voltage and do not see any on ether side.? Also received a 2.2K and 10K resistor with the kit,?
what are they for, or is one of them to be used as a pull up for the push button?

First uBITX kit

Bill K9JUI? Thanks
Re: DC blocking cap between souncard and ubitc mic input. #ft8 #ubitx

Joe Puma
 

¿ªÔÆÌåÓý

okay got it, so it removes some of the lower boomieness of the audio spectrum since it wouldn¡¯t be heard much anyway and allow more of the mid and highs to get through. my first impression was a audio filter as I am familiar with it use in that application but its good to know its blocking DC as well. I spent a few minutes reading this very basic understanding.?


Joe



On Mar 4, 2019, at 5:11 PM, iz oos <and2oosiz2@...> wrote:

Primarily it does block DC, however it attenuates somewhat more the lower frequencies (as 300hz) than the higher (3khz).


Il 04/mar/2019 22:56, "Joe Puma" <kd2nfc@...> ha scritto:
So it¡¯s not dc blocking but a audio filter??

Joe
Kd2nfc?



On Mar 4, 2019, at 4:52 PM, iz oos <and2oosiz2@...> wrote:

0.1uF at 300hz has a reactance around 5000ohm, at 3Khz 500ohm, so it acts as a sort of audio high pass filter. If the cap has a higher capacitance the audio response is flatter.


Il 04/mar/2019 19:15, "Joe Puma" <kd2nfc@...> ha scritto:
The easydigi does have this blocking cap. .1uf

Joe
KD2NFC?


On Mar 4, 2019, at 12:05 PM, Playthatbeat Mrdj <playthatbeat303@...> wrote:

So things are actually worse when using a transformer to isolate the mic line? So things like the easy-digi etc. make things worse? this was not my experience at all. before using a transformer, i could not sustain the audio connection between my (horrible) single audio jack on my handheld PC, but after i could without issue.

So, it's possible that using easy-digi or a transformer is shunting the voltage on the mic line to ground, which could cause all manner of strange problems with the uBitx? Is this correct?





Re: Pseudo-Sine?

 

Amazing what you can find in the forum archives with a little digging.
The audio oscillator thing on the Collins KWM-2 only sorta worked slick,
though I don't personally have any objections if you want to do it this way on a QRP rig.?

Jerry, KE7ER


From post? ?/g/BITX20/message/22372

##################################################
Dennis Kidder W6DQ
02/21/17???#22372??

Collins did, indeed, use an audio tone to generate CW in their early S-Line equipment.? The Collins design fed the sidetone oscillator into the audio section on the KWM-1, KWM-2/A and 32S-1/2.? And if you know the history of this, they realized the "error in their ways," and soon went to a different design. If the balanced mixer is not properly nulled and/or the filter passband is off a bit, the result can be three carriers!? Many amateurs using this equipment on CW received "pink tickets" from the FCC.???
?
Collins changed the design with the 32S-3/A.? Today, CW is not recommended with the 32S-1/2 or KWM-2/A radios without careful monitoring of the output signal.
?
The earlier Collins KWS-1 (Collins Radio's first amateur SSB transmitter) produced CW by inserting the BFO signal AFTER the bandpass filter, bypassing the balanced modulator a well.? This produces a very clean output.
?
Don't get me wrong -- I am not saying NOT to use an audio oscillator to generate CW -- I?AM?saying that you need to be careful and understand the potential problems it can produce.? Personally, I am choosing to insert the keyed BFO signal, with proper shaping, after the crystal filter to generate CW, bypassing the TX first mixer and filter.? Keep in mind that the TX and RX frequencies will be zero beat unless provision is made to shift either the TX or RX when going from TX to RX.? I believe adding RIT is a probably an easy solution here.? Of course, I will also need to add sidetone.
?
Thanks to all for maintaining such a great forum for a great little radio!
?
73,

-dennis W6DQ
##################################



On Mon, Mar 4, 2019 at 02:00 PM, Tim Gorman wrote:
Evan,

IIRC this is how the old Collins KWM-2 used to do CW. Injection of an
audio tone. Again, IIRC that's how you did the spot function on cw, turn
on the audio osc and zero beat it with the received cw signal.

Worked slick for the KWM-2. Should work with the ubitx as well! It
would be a simple add-on.

tim ab0wr
Re: DC blocking cap between souncard and ubitc mic input. #ft8 #ubitx

 

Primarily it does block DC, however it attenuates somewhat more the lower frequencies (as 300hz) than the higher (3khz).


Il 04/mar/2019 22:56, "Joe Puma" <kd2nfc@...> ha scritto:
So it¡¯s not dc blocking but a audio filter??

Joe
Kd2nfc?



On Mar 4, 2019, at 4:52 PM, iz oos <and2oosiz2@...> wrote:

0.1uF at 300hz has a reactance around 5000ohm, at 3Khz 500ohm, so it acts as a sort of audio high pass filter. If the cap has a higher capacitance the audio response is flatter.


Il 04/mar/2019 19:15, "Joe Puma" <kd2nfc@...> ha scritto:
The easydigi does have this blocking cap. .1uf

Joe
KD2NFC?


On Mar 4, 2019, at 12:05 PM, Playthatbeat Mrdj <playthatbeat303@...> wrote:

So things are actually worse when using a transformer to isolate the mic line? So things like the easy-digi etc. make things worse? this was not my experience at all. before using a transformer, i could not sustain the audio connection between my (horrible) single audio jack on my handheld PC, but after i could without issue.

So, it's possible that using easy-digi or a transformer is shunting the voltage on the mic line to ground, which could cause all manner of strange problems with the uBitx? Is this correct?

Re: Pseudo-Sine?

 

Evan,

IIRC this is how the old Collins KWM-2 used to do CW. Injection of an
audio tone. Again, IIRC that's how you did the spot function on cw, turn
on the audio osc and zero beat it with the received cw signal.

Worked slick for the KWM-2. Should work with the ubitx as well! It
would be a simple add-on.

tim ab0wr

On Mon, 04 Mar 2019 10:18:11 -0800
"Evan Hand" <elhandjr@...> wrote:

When I tested the SSB harmonic performance with a single audio tone,
it looked to me like a CW carrier. I also noted that the harmonics
were much lower using the full SSB path.? Is a simple solution to
create a pure audio tone that is keyed with the PTT signal line?? The
built in side tone generator would need to be significantly filtered
to make it into a clean sine wave.

Just an idea, not really into CW myself (at least at this point).

73
Evan
AC9TU
Re: DC blocking cap between souncard and ubitc mic input. #ft8 #ubitx

Joe Puma
 

¿ªÔÆÌåÓý

So it¡¯s not dc blocking but a audio filter??

Joe
Kd2nfc?



On Mar 4, 2019, at 4:52 PM, iz oos <and2oosiz2@...> wrote:

0.1uF at 300hz has a reactance around 5000ohm, at 3Khz 500ohm, so it acts as a sort of audio high pass filter. If the cap has a higher capacitance the audio response is flatter.


Il 04/mar/2019 19:15, "Joe Puma" <kd2nfc@...> ha scritto:
The easydigi does have this blocking cap. .1uf

Joe
KD2NFC?


On Mar 4, 2019, at 12:05 PM, Playthatbeat Mrdj <playthatbeat303@...> wrote:

So things are actually worse when using a transformer to isolate the mic line? So things like the easy-digi etc. make things worse? this was not my experience at all. before using a transformer, i could not sustain the audio connection between my (horrible) single audio jack on my handheld PC, but after i could without issue.

So, it's possible that using easy-digi or a transformer is shunting the voltage on the mic line to ground, which could cause all manner of strange problems with the uBitx? Is this correct?

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