Re: Harmonics measured by Warren. How bad?
On Monday, August 27, 2018, 4:01:33 PM PDT, ajparent1/KB1GMX <kb1gmx@...> wrote:
you need a two tone source and that can be just a few trasistor and I think Elecraft sells a small one. 2T-gen 2-Tone Test Oscillator? looks like 80$ DK7IH has the one I built on his website ..Need to add 2 switches to shown schematic to cutoff each oscillator individually to set levels ..2 transistors 6 caps some resistors 2 pots ...fiddle with the caps to get freq right ....Not 80$
Jim
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Re: Nextion 3.2 for CEC 1.097
#ubitx
There is no simple way to scale in the Nextion editor.? Basically any images must be exported, scaled (or remade) and then replaced in the editor.? None of the page elements would line up so they would all have to be resized and moved.? You can click and drag various page elements to move and resize each one, but when lining and sizing things up to the pixel, you pretty much have to enter values into x,y,w and h. Also, some things like height in waveform don't scale up very well as how it is displayed is based on the data the Nextion screen is receiving from the arduino.? It's almost as much work as designing it from scratch.? You are basically remaking the gui for each screen size.
Darren
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Re: Right-sided relay harmonic attempted fix for v3/4 ubitx
By the way, my tiny attenuators arrived.? Maybe I'll try solder paste, bare wires, a hot air rework station and the scotch tape?trick outlined by Ian, kd8cec.  Tom, wb6b
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Just looking for some insight.? See attachment for details.
Mike
K5ESS
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Re: sub-harmonic mixer BITX harmonics and spurs
it would make them horribly worse. i am back to the bench today and i hope i can figure out a few fixes for these soon.
- f
On Tue, Aug 28, 2018 at 1:12 AM, Arv Evans <arvid.evans@...> wrote: I wonder if anybody has considered using sub-harmonic mixers in BITX, and
what the effect might be on harmonics and spurs?
Arv
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Re: Right-sided relay harmonic attempted fix for v3/4 ubitx
Gordon,
Thanks for sharing your information so far and the pictures of your setup. Looks like real metal under your uBITX, bolted to the corners, so satisfies the bee in my bonnet about that.
As a digital guy, I know about bit buckets-- I've never seen an RF bucket before this.
Tom, wb6b
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Re: #ubitx. Great EFHW group on Facebook
barry
No offense.? It is all part of the game we play as ham radio operators.? Sometimes we take it
a bit too serious, and sometimes not serious enough.??? 8-)
Easiest way to find things that have been discussed earlier is to log into and
use the message search capability to find lists of messages about a particular topic.?
Arv
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On Mon, Aug 27, 2018 at 6:21 PM Bo Barry < bobarr@...> wrote: Been skipping them, thinking I was the cause of it started.? Wrong I guess.
But since I'm 100% sold on my no tuner MyAntennas EFHW I'm reluctant to read anymore about it. ?
Too anxious in tuning up the rig.
Sorry if I offended.
PS I'm interested in Farhan s earlier comments on power improvement but can't find it. In May I believe.
I'm happy with my v4 and went back to my v3 which is a bit puny.? I haven't put the socket pins in it and some 2222A's are on order.? I'm interested in tinkering with the other simple mods he had. The Q90 mod is beyond my patience even tho I have a microscope, etc.? Links appreciated in case I can't find them, if you have them handy. ? I think the topic was more power on 10 meters
. Thanks Bo?
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Howard, do you still have the 3 parts you were offering? I accumulated another v3 and thought I would try them.
Bo W4GHV
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Re: #ubitx. Great EFHW group on Facebook
Whoops, I found it! C81, R83, R261, R262 mods? ?and some by Howard ? for added 33uH and 220pf caps
Going to study them after I do the 2222A thing. 73, Bo
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Re: Odd Raduino, How do I Connect it?
#bitx40
All of them.
Those pins to the left match the uBitx V3 and V4 board socket.
Allison
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Re: Nextion 3.2 for CEC 1.097
#ubitx
Darren--it is possible to click and drag and resize in the nextion editor gui to rescale for different display sizes.? I'm trying to figure out the Nextion editor, and it is not obvious how one goes about rescaling/resizing other than directly editing the appropriate x, y, h? and w values in each attribute...have I missed something?
Thanks for all your good work on this.
John WI6P
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Re: #ubitx. Great EFHW group on Facebook
Been skipping them, thinking I was the cause of it started. ?Wrong I guess.
But since I'm 100% sold on my no tuner MyAntennas EFHW I'm reluctant to read anymore about it. ?
Too anxious in tuning up the rig.
Sorry if I offended.
PS I'm interested in Farhan s earlier comments on power improvement but can't find it. In May I believe.
I'm happy with my v4 and went back to my v3 which is a bit puny.? I haven't put the socket pins in it and some 2222A's are on order. ?I'm interested in tinkering with the other simple mods he had. The Q90 mod is beyond my patience even tho I have a microscope, etc. ?Links appreciated in case I can't find them, if you have them handy. ? I think the topic was more power on 10 meters
. Thanks Bo?
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Re: Right-sided relay harmonic attempted fix for v3/4 ubitx
On Aug 27, 2018, at 18:52, Gordon Gibby < ggibby@...> wrote:
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8/27/2018.? ?Here are the baseline data.? ?Unmodified uBitx with RV1 roughly in the middle, 7Ahr battery, producing about 11.5 V under load.? RG8X to Micronta SWR/"pwr" meter RG8X to Heathkit Cantenna with 50 db tap (16K/50 ohms) then double shielded coax
to a 20 dB BNC pad to my ICOM718 (shares transceiver).? ?Each signal tuned for maximum S-meter.? ?CW only mode tested.? ? ?S0 means I could hear it, but no reading on S meter
The S9+30dB reading today at fundamentals is slightly higher than the S9+25 previously seen -- room is warmer???
Freq? ? ?Meas? Fundamental? ? ?2ndHar? ? ?3rdHarm? ? ? 4thHarm? ? 5thHarm? ? ? 6thHarm? ? 7thHarm
3.505? ? 5W? ? ?S9+30 dB? ? ? ? S7.5? ? ? ? ? ?S8.5? ? ? ? ? ? S0? ? ? ? ? ? ?S8? ? ? ? ? ? ? ?S0? ? ? ? ? ? ?S8.5
7.005? ?2.5W? ?S9+30 db? ? ? ? S0? ? ? ? ? ? ? S8.5? ? ? ? ? ? S5.5*? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?* = wavering signal level
9.995? ?1.5W? ?S9+30 db? ? ? ? S0? ? ? ? ? ? ? S9
14.005 1W? ? ? S9+30 db? ? ? ? S0
Now to build the "daughterboard" relay system.? ?My plan is to connect it first by the most simplest? of connections, with just "wires", reasonably neatly, and short, but not shielded and nothing fancy.? ?Then see whether/what improvement there is.
? ?
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Re: Harmonics measured by Warren. How bad?
Yes. I remember those old HP analyzers well...along with the poloroid camera for taking screen shots. Yes, a tight resolution BW is essential. When I worked at the monitoring station back in the late 70s and early 80s, we used to measure HF military multitone teletype circuits. 16 encrypted circuits (32 distinct frequencies) on a single voice channel. We had to tighten the res bw up as tight as it would go and use a really slow sweep. Good luck!
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Re: End Fed antennas w/ uBITX
#ubitx
ARV,
I agree, the attention span is short.
Close the thread, copy it there.? Then kill the new one Bo started.
Allison
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Re: #ubitx. Great EFHW group on Facebook
Bo I guess you missed the 320 or so positings here about EFHW antennas.
Allison
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Re: Harmonics measured by Warren. How bad?
you need a two tone source and that can be just a few trasistor and I think Elecraft sells a small one.
2T-gen 2-Tone Test Oscillator? looks like 80$
Learn the SA as you will need to get slow scans at fairly narrow bandwidths 300Hz RBW and 10khz VBW.
Span is narrow as you only want to catch less than +-10khz of carrier.??
THe procedure is describe in the ARRL Lab and on line.
Now your ready...
Allison
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Re: Right-sided relay harmonic attempted fix for v3/4 ubitx
8/27/2018.? ?Here are the baseline data.? ?Unmodified uBitx with RV1 roughly in the middle, 7Ahr battery, producing about 11.5 V under load.? RG8X to Micronta SWR/"pwr" meter RG8X to Heathkit Cantenna with 50 db tap (16K/50 ohms) then double shielded coax to a 20 dB BNC pad to my ICOM718 (shares transceiver).? ?Each signal tuned for maximum S-meter.? ?CW only mode tested.? ? ?S0 means I could hear it, but no reading on S meter
The S9+30dB reading today at fundamentals is slightly higher than the S9+25 previously seen -- room is warmer???
Freq? ? ?Meas? Fundamental? ? ?2ndHar? ? ?3rdHarm? ? ? 4thHarm? ? 5thHarm? ? ? 6thHarm? ? 7thHarm
3.505? ? 5W? ? ?S9+30 dB? ? ? ? S7.5? ? ? ? ? ?S8.5? ? ? ? ? ? S0? ? ? ? ? ? ?S8? ? ? ? ? ? ? ?S0? ? ? ? ? ? ?S8.5
7.005? ?2.5W? ?S9+30 db? ? ? ? S0? ? ? ? ? ? ? S8.5? ? ? ? ? ? S5.5*? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?* = wavering signal level
9.995? ?1.5W? ?S9+30 db? ? ? ? S0? ? ? ? ? ? ? S9
14.005 1W? ? ? S9+30 db? ? ? ? S0
Now to build the "daughterboard" relay system.? ?My plan is to connect it first by the most simplest? of connections, with just "wires", reasonably neatly, and short, but not shielded and nothing fancy.? ?Then see whether/what improvement there is.
? ?
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Re: Harmonics measured by Warren. How bad?
Allison, Thanks.? I have another question for you RE IMD but I have to put some data together first.? BTW just got my spec anal a couple of weeks ago.? Still in learning mode.? Last experience with a spec anal was back in the ¡®70s and ¡®80s with HP8566 and HP3561 and 3562.? The latter being used in a laboratory High Range Resolution Radar. Mike K5ESS ?
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From: [email protected] [mailto:[email protected]] On Behalf Of ajparent1/KB1GMX
Sent: Monday, August 27, 2018 2:33 PM
To: [email protected]
Subject: Re: [BITX20] Harmonics measured by Warren. How bad? ? K5ESS
Looing at the your SA....
You have to use narrower RBW to see things like IMD and other more detailed artifacts.
That also means slowing the sweep...
For harmonics, looks decent!
Allison
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Re: End Fed antennas w/ uBITX
#ubitx
The frustration comes in that the End Fed discussion was quite long and an antennas group came out of it. The discussion and arguments should've moved there but people keep reviving it here. While it's true that some people use an end fed on their ubitx, I don't. I use one on my Kenwood while camping and have one here for 40-10 for whatever rig I happen to be using for a base station.
Vince - K8ZW.
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On 08/27/2018 04:35 PM, iz oos wrote: I have been following this thread from the beginning, there was an
interesting debate other than fun at times with seemingly opposite
views. I don't see where frustration could come from this thread. Was it
related to uBitx? Partly yes, some Ubitx users use this antenna, others
like me want to understand what is inside the black box transformer. And
as this antenna operates with a satisfactory efficiency on the harmonics
too, a uBitx user has to take this into account.
Il 27/ago/2018 21:00, "Arv Evans" <arvid.evans@...
<mailto:arvid.evans@...>> ha scritto:
Guy WB7SZI
The "antennas" group was started out of frustration with the ongoing
going on about
end-fed antennas. Starting that group was partly in hopes that the
end-fed discussion
might move there, and partly as a social experiment to see if it
would move. Now there
are end-fed discussions on both the BITX group and on the antennas
group. Not sure
if that is progress or a comment on social aspects of discussion groups.
Arv K7HKL
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On Mon, Aug 27, 2018 at 10:16 AM Guy N7BIR <sgbridge@...
<mailto:sgbridge@...>> wrote:
Why are we still having discussions on End Fed Antennas? Thought
that was why the Antenna email list was started.
Cheers,
Guy WB7SZI
--
Michigan VHF Corp.
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Darren VE3XLT
Brent Seres/ VE3CUS