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Re: Right-sided relay harmonic attempted fix for v3/4 ubitx
Gordon,
Good to see you are making positive progress.
Re:- the before & after figures
I don't know the Icom 718, as a background just in case someone else
tries to repeat your tests. It's normally quoted as 6dB per S point.
Pretty much all radios will be different. Its a repeatable test to
the same reference value on the meter on the same radio but not
necessary beyond that, the meter reading may be non-linear etc.
Alison suggested the stepped attenuator approach to bring the
fundamental down to the same indicated level on the meter as the
harmonic, the amount of added additional attenuation indicates the
harmonic reduction.
The measurement accuracy is then transferred to that of the
attenuator,? and is more easily characterised.
It is also transferable to other peoples measurements regardless of
method, by radio or a spectrum analyser etc.
Can Alison comment?
Alan
On 29/08/2018 03:24, Gordon Gibby
wrote:
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Able to charge that battery significantly and proceed with tests.
All of these have a homebrew 50 dB tap on a Heathkit Cantenna, and
then a 20dB attenuator at the input of the ICOM 718.? ?Previous
measurements have suggested that between S7 and S9,? ?an S unit is
approximately 12 DB.
Presented witll be the BEFORE/AFTER? ?S unit measurements where
before is the relatively STOCK uBitx and the AFTER is is with my
external daughterboard, with basically unshielded wiring.
All measurements are for CW (because this is where the unit had
the most problems)
Power is estimated from a Micronta cheap SWR/power bridge built
for CB'ers many many years ago.??
FREQ? ? ? PWR? ? ? ?FUNDAMENTAL? ? ? ?2ndHArmonic? ? 3rdHarmonic?
?4thHarmonic? ? 5thHarmonic? ? ?6thHarmonic? ? ?7thHarmonic
3.505? ? 5 W/5+W? S9+30/S9+30? ? ? ? ? ?S7.5 / S7? ? ? ? ? ?S8.5
/? S6? ? ? ? S0 /? ?S0? ? ? ? ? ?S8 /? S1? ? ? ? ? ? S0 / S0? ? ?
? ? ? ? S8.5 / S8? ??
(so on 80 meters, the 3rd and 5th harmonics were greatly
attenuated, and the 7th lost maybe 6 db)
7.005? ?2.5/3.5W? ?S9+30/S9+30? ? ? ? ? ?S0/ S0? ? ? ? ? ? ? ?S8.5
/ S7? ? ? ? ?S5.5*/S0? ? ? ?*=wavering
(so on 40 meters, harmonics went? down by huge amounts
9.995? ?1.5/1.5 W? S9+30 /S9+30? ? ? ? ? S0 /S0? ? ? ? ? ? ? ?S9 /
S5 or less
(so on 30 meters, the 3rd harmonic was basically demolished)??
In previous testing on 14 MHz, I cant go any farther than the 2nd
harmonic and it was S0 (no reading) so not much for me to work on
profitably there...and that is the filter that I damaged.
This looks overall, like a huge success.? ?The only oddity is the
7th harmonic of the 80 meter signal (why??)? ?but even it may be
down 42 db.? ?On these bands, my crude testing indicates that even
CW now either passes with flying colors or is very very close to
it.? ?If I shield or even twist a ground around the INPUT (red in
the photographs) wire it may get better.
Cheers,
Gordon Gibby
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Re: Nextion 3.2 for CEC 1.097
#ubitx
Hi John
I tried to do something on editor but I'm not sure about the result , pages 3,4,7,8,9,10 .
Nikos
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Re: Can we start using SUBGROUPS? uBiTX, biTX40, QRPKITS, Original BiTX20, Homebrew, Other?
If you need to, you can mute threads. Unless a mod has the time to sort threads on top of the basic duties forget it. Its a nice idea that will never be implemented. The reason being that its not worth the effort.?
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Re: Can we start using SUBGROUPS? uBiTX, biTX40, QRPKITS, Original BiTX20, Homebrew, Other?
Sorry; can't edit...
I'd say just a FEW groups - the major topics, maybe?
No more than 3 or so?
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Re: Can we start using SUBGROUPS? uBiTX, biTX40, QRPKITS, Original BiTX20, Homebrew, Other?
I vote YES.
It's difficult to suss thru different threads - so much so, I've stopped reading it (to a large degree).
I have a 'first gen' (Ver 3 PCB?) - and an older BitX20.?
It's just hard to wade thru; and I can't really contribute to some.
Mike Yancey, KM5Z
Dallas, Texas
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Yes, sorry, that is what I get for
working late.
On 8/28/2018 11:42 PM, Jack Purdum via Groups.Io wrote:
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I think you mean Arduino Nano, Right?
On Tuesday, August 28, 2018, 11:38:30 PM EDT, Howard
Fidel <sonic1@...> wrote:
As some of you know, my
Raduino died a few weeks ago. The Arduino Uno board
failed, so I changed it. The new Arduino worked, but the
SI5351 clock chip didn't. I found that the damaged
SI5351 damaged the new Ardunio SCL and SDA outputs. I
removed the SI5351 and again replaced the Arduino Uno
(it is a good thing I bought 3). I then ordered the
Adafruit SI5351 breakout board. I the board arrived last
Monday, just when I left for a few days in New Mexico
and Arizona. I got back last night, and today installed
the Adafruit board. Now the Raduino is up and running. I
have attached a marked up schematic just in case someone
needs to to the same some day, as well as a picture.
Although not indicated on the schematic, I also removed
R13 and R14 from the Raduino. The Adafruit board it JP1
on the schematic.
I also started to work on the filter modifications. I
did not get the expected result on 80 meters, and over
the next few days, I will try to find out why.?
Howard
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Re: UBITX V3 TX GAIN VARIATIONS
Good timing ..Just did a frequency sweep Jim  
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Re: Right-sided relay harmonic attempted fix for v3/4 ubitx
?Great!? ?Perhaps it will help some people who are concerned about the harmonics.? ?The total cost of the kit boiled down to
$2.50 or less for the board when purchased in quantity of 10 or so from China even with 1 week DHL shipping
$11 or so for the three relays
$2 or so for the inductors and capacitors
Use IN4001-1N4007 for the diodes (I should have speified that!)??
So about $15 and some elbow grease to really knock down the harmonics.? ?I pay more than that for a 12V battery!
What a great ubitx transceiver Ashar F. developed for the world!
Cheers,
Gordon
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Right Gordon, I will study the documents so I might replicate a hopefully reasonably good copy of it. Thanks very much!
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Re: Right-sided relay harmonic attempted fix for v3/4 ubitx
Right Gordon, I will study the documents so I might replicate a hopefully reasonably good copy of it. Thanks very much!
Il 29/ago/2018 14:38, "Gordon Gibby" < ggibby@...> ha scritto: H? iz oos -
I can't really provide "kit service" since I'm a physician by trade and this would take way more time than I am able to commit to the effort.? Perhaps some enterprising soul (or company) will take up the kitting of it.? ?In the meantime, I have now published everything needed to replicate the entire effort --- and I can assist anyone who wishes to become the "kitter" by helping them get boards, etc.
Board Gerber Files ready to send to or any other pcb fabrication shop:??
Construction Document:? (how-to):? ?
Original DesignDocument (background design information):??
That should be enough for anyone to build it if they understand a bit of schematic reading or can follow photographs!!
Gordon
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Re: Right-sided relay harmonic attempted fix for v3/4 ubitx
H? iz oos -
I can't really provide "kit service" since I'm a physician by trade and this would take way more time than I am able to commit to the effort.? Perhaps some enterprising soul (or company) will take up the kitting of it.? ?In the meantime, I have now published everything needed to replicate the entire effort --- and I can assist anyone who wishes to become the "kitter" by helping them get boards, etc.
Board Gerber Files ready to send to pcbway.com or any other pcb fabrication shop:??
Construction Document:? (how-to):? ?
Original DesignDocument (background design information):??
That should be enough for anyone to build it if they understand a bit of schematic reading or can follow photographs!!
Gordon
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Something to note.... I've had much better luck using the 3.3 volts from the Nano than feeding 5 volts to the Adafruit Si5351.?
Your mileage may vary,
Jim? W0CHL
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Re: Right-sided relay harmonic attempted fix for v3/4 ubitx
Gordon,
These spurs start from 0Hz and move up at the rate of 5x, 4x, 3x of the amount the display
changes with center is at multiples of 2.5MHz. Example 15Mhz everything almost vanishes
but at 14Mhz you will get spurs at 3Mhz, 4MHz and 5Mhz on either side of 15MHz.
At some points of the HF I get strong spurs between 0 and 5Mhz.. :-(
2.5Mhz is a common denominator somehow. The max spur spread occurs at 1.25MHz on
either side of these homing points.
Raj
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At 29/08/2018, you wrote: Is there some series resonance in the 80 meter LP filter at 24 MHZ, or why is that one harmonic so much stronger than others? Anyone have an answer?
Thanks,
Gordon
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Re: Right-sided relay harmonic attempted fix for v3/4 ubitx
Hi Gordon,
That is interesting, relays that are polarity sensitive. Maybe that is how they make a "sensitive" relay, by adding a bias magnet inside. I downloaded the data sheet and see the +- on the coil. Glad to know about this before I lay something out without realizing there are now polarity sensitive relays, that are not of the latching variety.?
It is interesting the the 7th harmonic (24Mhz) of 80M and the 3rd harmonic (21Mhz) of 40M are both the highest harmonics you have. Maybe it is something that will improve as you experiment with the wiring.
Tom, wb6b
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Re: Right-sided relay harmonic attempted fix for v3/4 ubitx
Given the tools you have used and for the fact you applied the KISS principle, you made a condiderable work Gordon. Are you planning to provide a kit with detailed information on connections and cut and trace removal or will you provide a detailed information about what to do?
Il 29/ago/2018 10:36, "Gordon Gibby" < ggibby@...> ha scritto:
I ¡®d like to point out that if the relays are placed on the (normal) TOP of the board, they would work fine as wired & not require the rewriting I had to do.?
Board was laid out correctly with respect to their polarity when installed on top?
Is there some series resonance in the 80 meter LP filter at 24 MHZ, or why is that one harmonic so much stronger than others?? Anyone have an answer?
Thanks,
Gordon
On Aug 29, 2018, at 02:37, Glenn < glennp@...> wrote:
promising results there Gordan.
While I would love to pursue mine further, but the problem of fitting it into the existing case is a problem.? Might look at another way or flatter relays! or bigger case.
glenn vk3pe
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Re: Right-sided relay harmonic attempted fix for v3/4 ubitx
I ¡®d like to point out that if the relays are placed on the (normal) TOP of the board, they would work fine as wired & not require the rewriting I had to do.?
Board was laid out correctly with respect to their polarity when installed on top?
Is there some series resonance in the 80 meter LP filter at 24 MHZ, or why is that one harmonic so much stronger than others? ?Anyone have an answer?
Thanks,
Gordon
On Aug 29, 2018, at 02:37, Glenn < glennp@...> wrote:
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promising results there Gordan.
While I would love to pursue mine further, but the problem of fitting it into the existing case is a problem.? Might look at another way or flatter relays! or bigger case.
glenn vk3pe
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Ok, it will never be a Ford Cosworth, but at least LPF will polish the tricycle...
Il 28/ago/2018 19:53, "Warren Allgyer" < allgyer@...> ha scritto: Alison
i have put my uBitx on the shelf and plan no further work on it. Just too many issues trying to make a Ford out of a tricycle. I put these up as an assist for those still trying.?
WA8TOD
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Re: Right-sided relay harmonic attempted fix for v3/4 ubitx
promising results there Gordan.
While I would love to pursue mine further, but the problem of fitting it into the existing case is a problem.? Might look at another way or flatter relays! or bigger case.
glenn vk3pe
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Re: Odd Raduino, How do I Connect it?
#bitx40
Thanks for the clarification Vic, it?s a bitx40. They have the same hardware now for the kits. I also have an older version of bitx40 with the original Raduino version. I?m on track now. And soon enough in the air mainly on digital.
Arne
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Unassembled uBITX; this is from the first batch shipped in December 2017.? Has the FCI TDA2822M audio chip. $125 shipped to U.S. address. I will send electronic copies of documentation via e-mail. kg0ew <at> arrl.net
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Alan de G1FXB
SV9CVJ Nikos
Raj vu2zap
W4WKU