Matthias DD7NT

You can check the CW pin input to its ADC by connecting a reasonably high impedance voltmeter
to the pin and then reading voltage while sending (1) straight key closed, (2) dit closed, and (3) dah
closed.? Each of these should give a different voltage to the CW input ADC pin.? The ADC reads
these voltages and the Arduino decides what to send if these voltages are lower than the +5V
supply.? There is some small range for each voltage to allow for resistor tolerance.?

Closure of the straight key should show zero volts on the CW input.
Closure of the dah paddle should show 3.4 volts on the CW input.
Closure of the dit paddle should show 1.6 volts on the CW input.
Voltage readings are approximate and there is some small range allowed to compensate for that.

<>

Arv? K7HKL
_._

hmmm..... looks like I got lost trying to retype them.....

enclosed is the actual pdf I'm using as a data gathering sheet....harmonics were created by a spreadsheet.



________________________________________
From: [email protected] <[email protected]> on behalf of Vince Vielhaber <vev@...>
Sent: Monday, August 27, 2018 3:02 PM
To: [email protected]
Subject: Re: [BITX20] Right-sided relay harmonic attempted fix for v3/4 ubitx

yep, the 3rd for 80 meters

Vince.


On 08/27/2018 02:58 PM, Gordon Gibby wrote:

Hmm.... don't know where the 175.525 came from????
Any others look suspect to you?

________________________________________
From: [email protected] <[email protected]> on behalf of Vince Vielhaber <vev@...>
Sent: Monday, August 27, 2018 2:44 PM
To: [email protected]
Subject: Re: [BITX20] Right-sided relay harmonic attempted fix for v3/4 ubitx

Are these typos or is your math really that bad?

Vince.

On 08/27/2018 09:14 AM, Gordon Gibby wrote:

I'm expecting to be able to make real baseline measurements tonight.
My receiver (Icom 718) cannot really go past 30 Mhz so I'm restricted
to measuring harmonics' strengths below that frequency.

So here are my plans for measuring. For the 30 meter band, since I'm
on dummy loads (no signfiicant radiation) I'm going to sneak slightly
UNDER 10 MHz so I can catch the important 3rd harmonic on the ICOM 718:

Fundamental 2Har 3Har 4Harm 5Harm 6Harm 7Harm
3.505MHz 7.010 15.515 14.020 175.525 21.030 24.535
7.005 14.010 21.015 28.020
9.995 19.990 29.985
14.005 28.010


Although that doesn't cover all the bands, the problem on the higher
bands shifts to spurs, which the Low Pass Filters aren't as well
targeted at --- but hopefully with just these baseline measurements, the
proof-of-concept of simple-minded daugherboard addition of a separate
relay to avoid relayccontact-to-relaycontact blow-pass will be either
proven or disproven.

I had hoped to make these measurements this morning but was not able to
get that done before going back to work. I have the next several days
"off" so this may speed up.

Cheers,
gordon

--
Michigan VHF Corp.

--
Michigan VHF Corp.

yep, the 3rd for 80 meters

Vince.

--
Michigan VHF Corp.

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That procedure [adjusting attentuators until S meter reads same]??would work fine, but I'm dealing with BNC pad attentuators and physically switching them all around is tedious and I can't keep the transmitter going that long I suspect.

So the real GOAL here is to see WHAT DIFFERENCE is made by adding in a right-sided relay system....so just getting intial and 'after'? measurements probably suffices, but to try and "calibrate" the s-meter I ran through every attentuator I had and calibrated it as best as I could, so I actually have SOME idea where the FCC regulation requirement truly is as well...

I'm just doing CW as others have already shown that the SSB has leser / differnt problems.....and my target is the layout of the low pass filters, not the odd products found from the mixer systems....can't fix those with my little modification....

hope that helps!

gordon

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Hmm.... don't know where the 175.525 came from????
Any others look suspect to you?

________________________________________
From: [email protected] <[email protected]> on behalf of Vince Vielhaber <vev@...>
Sent: Monday, August 27, 2018 2:44 PM
To: [email protected]
Subject: Re: [BITX20] Right-sided relay harmonic attempted fix for v3/4 ubitx

Are these typos or is your math really that bad?

Vince.

On 08/27/2018 09:14 AM, Gordon Gibby wrote:

I'm expecting to be able to make real baseline measurements tonight.
My receiver (Icom 718) cannot really go past 30 Mhz so I'm restricted
to measuring harmonics' strengths below that frequency.

So here are my plans for measuring. For the 30 meter band, since I'm
on dummy loads (no signfiicant radiation) I'm going to sneak slightly
UNDER 10 MHz so I can catch the important 3rd harmonic on the ICOM 718:

Fundamental 2Har 3Har 4Harm 5Harm 6Harm 7Harm
3.505MHz 7.010 15.515 14.020 175.525 21.030 24.535
7.005 14.010 21.015 28.020
9.995 19.990 29.985
14.005 28.010


Although that doesn't cover all the bands, the problem on the higher
bands shifts to spurs, which the Low Pass Filters aren't as well
targeted at --- but hopefully with just these baseline measurements, the
proof-of-concept of simple-minded daugherboard addition of a separate
relay to avoid relayccontact-to-relaycontact blow-pass will be either
proven or disproven.

I had hoped to make these measurements this morning but was not able to
get that done before going back to work. I have the next several days
"off" so this may speed up.

Cheers,
gordon

--
Michigan VHF Corp.

Tom wb6b and all,

Agreed its rare for a S meter to be accurate save for maybe one point.
I usually set for 50uV as S9 if reasonable for the radio other its random.

Usually when using a receiver for a check I pick a meter indication and?
note what it takes (from an attenuator) to get that reading then change
the source and see what the difference in the setting of the attenuator?
to get he same reading.? ?That is the gain or loss.? Works with a diode
detector or crappy radio or even a good one.? As the detector(radio) is
not calibrated and the set point such as S9 is reproducible but the
attenuator can be.

That procedure is old as dirt and makes no reliance on the radio
or its meters calibration.

Allison

Are these typos or is your math really that bad?

Vince.

--
Michigan VHF Corp.

In that case, I'm at a loss too!

As I don't have mine build yet, I can't go any further with this, and my Arduino coding skills are just a tad better than my ability to hold my breath under water for more than ten minutes.

I just recall seeing the schematic a few days ago as I was ordering some better jacks, and thought perhaps you might have missed seeing it. If it still doesn't work, then I throw up my hands and beg for someone further along on this project to jump in and help!

73 Ben Holmes, K6QV

Mike, does it draw only 1.2A for almost 10w output? It seems complaint as regards the 3rd harmonics but is that fat bell shape around the fundamental complaint as well?

Am 27.08.2018 um 19:54 schrieb Ben Holmes:

My guess would be to follow this schematic... and put in a second jack. You could also put (as I plan to) put a momentary push button across this (for when you don't have your key)

Hello Ben,

I followed this schematic. But there is only one Pin (A6) for CW input. And this port can be set between 0..5V (=4k7 to GND..4k7 left open).
I tested the whole range from 0..5V I got dit, dahs and ditdahs but nowhere a continuous tone. Maybe the ADC is a bit noisy and starts not with null. If the software reads the ADC and gives a coninuous tone only if (ADC == 0) then it will never work for some A328. Will get the sourcecode and look at it.

73 Matthias, DD7NT

hello, i have same problem, but in setting? have? choice not iamba? but hand key.. if i remember right... for me are a new world? after many? qso on? ssb? or digital mode..

hope?? you can? find? solution.?? tnx? for all friend have help me? about? other? problem.

best '73 from north italy de in3izq danilo

I will try both suggestions.
BTW, I'm using CEC 1.097 firmware

73's
AE K9AJE

My guess would be to follow this schematic... and put in a second jack. You could also put (as I plan to) put a momentary push button across this (for when you don't have your key)
https://ubitx.net/wiring-up-a-paddle-and-straight-key/

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?IR2028 doesn't really seem to have ANYTHING on spurious responses.? ?And I don't think you are really likely to exceed 10 W to the antenna if you stick to about 12V.? ? So I don't see any real problems with IR2028 (but I'm not a lawyer and I certainly don't live in the UK!)

cheers,

gordon

Using a v4 uBITX with latest firmware.
I have good audio level.
Hook up the antenna, get a lot of static. Tune in for example 10.0 Mhz (and around that frequency) and nothing.
Move antenna to my regular transceiver, get the 10.0 Mhz signal.

Similar on other bands.

Any suggestions?

PS: as I have 2 uBITX boards, I swap rigs, same results.