Re: What does zero-beat sound like?
#ubitx
Ralph, This is how many people suggest doing the ARRL frequency measurement test. tim ab0wr On Thu, 31 May 2018 18:14:42 -0400 "Ralph Mowery" <rmowery42@...> wrote: The tuning is close for those that do not have test equipment.
What I usually do is set a sideband rig readout either 1000 hz higher
or lower than the desired frequency depending on the sideband . Then
feed it a signal that is on frequency and put a counter on the
speaker. When the speaker output is 1000 hz, then the receiver is
set. No guessing about trying to hear the zero beat below around 100
hz or less.
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Re: Need Clarification on uBitx v. 4 Schematic
JackAl has both IF and audio AGC. This photo:
was taken at the FDIM conference. If you look closely, the graph above the speech compressor shot (sort of column 3, row 2, going from left to right, top to bottom) shows the rolloff for the AGC. Unfortunately, Al's got the JPG's for the plots. Put it this way: It's pretty good.
Jack, W8TEE
On Thursday, May 31, 2018, 9:45:14 PM EDT, Michael Shreeve <shreevester@...> wrote:
Its looking like the 2n7000 mosfet board completely shuts off the tx to clear the pop. But, I cannot find a modification that would account for Ashhar's description of a AGC which has something to do with the IF. The little board isn't removed from the circuit and is in operation when strong signals audio go through, so perhaps it limits them ? Or perhaps the schematic at doesn't include the AGC ??
On Thu, May 31, 2018 at 3:51 PM, Michael Shreeve <shreevester@...> wrote: Oh, and the pop eliminator looks like a 2n7000 board controlled by the T-R line. On a separate little board, much more simple than others I've seen. Five components total includes the mosfet. And a new test point TP1 ! And new jumpers where the little board connects. I haven't put the two 10X17 sheets side by side yet , and these still stand out.? A 1uf with a diode and resistor give the mute timing just enough time.?
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Nextion LCD must conform to the communication protocol specified. I applied the protocol specified in Nextion LCD and connected it with uBITX
Ian
Ian, correct me if I am wrong, is saying use the serial port to send FT-817 commands to control the uBITX.
rOn
On May 31, 2018 at 5:09 PM Joe <joeman2116@...> wrote:
This looks great to see progress for ubitx and nextion integration.
I am looking at purchasing:
Nextion Enhanced 3.2" HMI Touch display
Product Code : RB-Ite-174
Would this work ok for working with your development?
Thanks Joe VE1BWV
-- Best 73 KD8CEC / Ph.D ian lee kd8cec@...
(my blog)
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Re: boosting the power on 28 MHz
#ubitx
6M has been the magic band for many decades before me.? ;)
As a hard core VHF/UHF op I spend a lot of time on 6M.? How hard core?
My first three HB radios were for 6, they remain in service since.? 6M is
not high power, its good antennas, yagis and they are not hard to build.
The entry level is horizontal 3 elements on a 6ft boom and a few watts.
10M is a second favorite.? Its open more than closed.? The problem is everyone
is listening, no talking.? End of last cycle I got tired of hearing "10 is dead" so with a
tribander, end fed halfwave wire and qrp power [4W SSB] I worked 85 countries in
5 months.? There was TEP and Eskip enough that it included spots like MacMurdo
and the Falklands from W1 land.? Then a living got in the way... ;)
I hear its dead from many, they all answer the question, When did you call CQ there?",
they didn't.? ?If no one is talking someone has to make the first noise.? ? Generally true
most bands but generally 10 and 15 (and 17) will be daylite bands for a while and
occasional night skip.? Oh, and 6M is entering the E-skip season (least here in USA)
and EU too and that happens any time for a few minutes or hours.? The only way
to know is to be there.
Allison
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Re: Need Clarification on uBitx v. 4 Schematic
Its looking like the 2n7000 mosfet board completely shuts off the tx to clear the pop. But, I cannot find a modification that would account for Ashhar's description of a AGC which has something to do with the IF. The little board isn't removed from the circuit and is in operation when strong signals audio go through, so perhaps it limits them ? Or perhaps the schematic at doesn't include the AGC ??
On Thu, May 31, 2018 at 3:51 PM, Michael Shreeve <shreevester@...> wrote: Oh, and the pop eliminator looks like a 2n7000 board controlled by the T-R line. On a separate little board, much more simple than others I've seen. Five components total includes the mosfet. And a new test point TP1 ! And new jumpers where the little board connects. I haven't put the two 10X17 sheets side by side yet , and these still stand out.? A 1uf with a diode and resistor give the mute timing just enough time.?
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Re: boosting the power on 28 MHz
#ubitx
If you want to know if 10 is open listen to CH5 and 6 on CB. All the multi KW folks use those for ¡°Skip Talking¡±. ? ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of KENT HUFFORD
Sent: Thursday, May 31, 2018 17:04
To: [email protected]
Subject: Re: [BITX20] boosting the power on 28 MHz #ubitx? Like Bob Heil said. If everybody TRANSMITTED on 10m, then you may hear someone. <sic>. ? Kent ? ? ? 
On 5/31/2018 4:53 PM, Richard Spohn wrote: It's all due to marketing!? 10 meters is called the "Magic Band".? And everybody loves magic. - Rich WB2GXM ? On 5/30/18, Bo Barry <bobarr@...> wrote: I'm constantly surprised at the interest in 10 meters. I always check 15. If its dead I go to 20. If it has anything on it I check 10 and hear nothing here in NC with a simple EFHW.. ? But 10 was a blast back in 1954!!? ?:) ? 73, Bo W4GHV since '54 ?
? ? ?
?
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Re: Heat proofing the ubitx.
Hi Lee
I have an Anet A8. About 160 dollars from gearbest.com. Had it for about 18 months and have about 2400 print hours on it. Had to replace a few things but have used it steadily.
The electronics on the printer have been flawless although I did put fans on it too. The fan on the printer motherboard is held on with zip ties. Guess it deserves a shroud.
For me the most interesting part is learning how to create 3d shapes. I use Fusion 360 for that.
I went bigger on the case using the case off of a 50 year old stereo receiver. Have room for a lot more than in the case now.?
My fan just runs continously.
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I have not used the RB-Ite-174 yet, but I think it's possible.
RB-Ite-174 seems to be much better than I have. It is thought that GPIO is also used for RTC built-in.
Nextion LCD is available because all models use the same command.
Nextion LCD can also be developed and simulated without an LCD.
If you have USB To Serial, you can connect uBITX and Nextion LCD emulator on your computer without LCD.
I purchased the following model and now sells for $ 12 at a discount.
2.8" Nextion TFT LCD Display Module 320x240 Touc
Ian KD8CEC
This looks great to see progress for ubitx and nextion integration.
I am looking at purchasing:
Nextion Enhanced 3.2" HMI Touch display
Product Code : RB-Ite-174
Would this work ok for working with your development?
Thanks Joe VE1BWV
-- Best 73 KD8CEC / Ph.D ian lee kd8cec@...
(my blog)
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I agree with Daniel. You need to set your BFO. I had mine get out of alignment when the encoder button got stuck. It makes the receiver sound very tinny and harsh if your BFO is set too high. Lower the frequency 100 hertz at a time until it sounds good to you.
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Re: Need Clarification on uBitx v. 4 Schematic
Oh, and the pop eliminator looks like a 2n7000 board controlled by the T-R line. On a separate little board, much more simple than others I've seen. Five components total includes the mosfet. And a new test point TP1 ! And new jumpers where the little board connects. I haven't put the two 10X17 sheets side by side yet , and these still stand out.? A 1uf with a diode and resistor give the mute timing just enough time.?
On Thu, May 31, 2018 at 3:43 PM, Michael Shreeve <shreevester@...> wrote: I believe Ashhar is using the RD15HV IN rV4 . he ha done major mods, A complete descrete direct coupled audio amplifier circuit, a pop eliminator, an AGC , Lots of stuff. He claimed it was a dollars worth of parts, but, the board is a massive change. The Finals section in the schematic is very confusing and looks like a direct coupled Mosfet circuit, but that's probably not the case. Hopefully he's reading this , I printed the schematic 10x17 today and the changes stood out like a "western sore thumb" . Very tempting to have a second board.?
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Re: Need Clarification on uBitx v. 4 Schematic
I believe Ashhar is using the RD15HV IN rV4 . he ha done major mods, A complete descrete direct coupled audio amplifier circuit, a pop eliminator, an AGC , Lots of stuff. He claimed it was a dollars worth of parts, but, the board is a massive change. The Finals section in the schematic is very confusing and looks like a direct coupled Mosfet circuit, but that's probably not the case. Hopefully he's reading this , I printed the schematic 10x17 today and the changes stood out like a "western sore thumb" . Very tempting to have a second board.?
On Thu, May 31, 2018 at 2:46 PM, Mike <msmith@...> wrote: Thanks for the replies . . .?I figured they were meant to be options. May be better just to provide a text-box footnote in?schematic.
I've made dozens of FT8 contacts with a scratch built ubitx(V3) using the 510's, typically 10W PEP,? minimal heatsink, no fan, no?enclosure?. . . . the 510's?are actually quite rugged, stable, and predictable.
It's part of what makes it a fun build - they're cheap to replace when you drive them into oscillation and then *poof* !
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Re: What does zero-beat sound like?
#ubitx
Nice to know. On the other hand when you do install and it matches your assesment you may want to consider adding 'theroactual' to the dictionary.?
On Thu, May 31, 2018, 5:51 PM Dexter N Muir < dexy@...> wrote: More from the thinkery, Mike:
TP20 should give a good meter point. There's a 0.1uF to earth there, but at low freq and Z its Z won't affect much.
..and theoretical, 'cos I don't actually have one: stalled with bitx-40 and horrific QRM at the QTH :( .
73
Dex, ZL2DEX
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Re: boosting the power on 28 MHz
#ubitx
I always heard that 6 meters was the 'magic band' for the same reason.?
I hate that band because of the way it works.? I usually set up a 6 meter station for field day as it is sort of an extra points station..? Remember a few years ago that the band was wide open and about 5 minutes after the start of the contest it closed.??
ku4pt
On Thu, May 31, 2018 at 6:01 PM, atouk <atouk@...> wrote:
On 5/31/2018 4:53 PM, Richard Spohn
wrote:
It's all due to marketing! 10 meters is called the "Magic Band". And
everybody loves magic. - Rich WB2GXM
On 5/30/18, Bo Barry <bobarr@...> wrote:
I'm constantly surprised at the interest in 10 meters. I always check 15. If
its dead I go to 20. If it has anything on it I check 10 and hear nothing
here in NC with a simple EFHW..
But 10 was a blast back in 1954!!? ?:)
73, Bo W4GHV since '54
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Re: What does zero-beat sound like?
#ubitx
The tuning is close for those that do not have test equipment.
What I usually do is set a sideband rig readout either 1000 hz higher or lower than the desired frequency depending on the sideband .? Then feed it a signal that is on frequency and put a counter on the speaker.? When the speaker output is 1000 hz, then the receiver is set.? No guessing about trying to hear the zero beat below around 100 hz or less.
While I bought used test equipment and do not have that much in it, here I set with a $ 120 rig and use about? $ 5000 worth of test equipment to set it with. Would have been much less expensive to buy a transceiver already to go..But I would not have nearly as much fun working with this little rig.?
As I see it, Mr. Farhan did an excellent job of making an inexpensive rig for those that can not afford a more expensive rig, and for those of us that like to tinker with items that we do not have the skill or way to make the circuit boards and such from scratch.? + de ku4pt
On Thu, May 31, 2018 at 5:11 PM, Mike aka KC2WVB <rb5363@...> wrote: OK, I thought about this can of worms I opened on the ride home. Given the stores are 60 miles from the mountain top home I am staying at this summer I had roughly 45 minutes to sort through the various responses.
First, we should agree that the metric that establishes the accuracy one is aiming for is wave? lenght. Wave length of course is the distance propagated in one complete cycle. So Jerry is correct in that if your aim is to set an oscillator at a set frequency then being off by as much as 300 hz when using? a 30 MHz signal as a reference is equivalent to being off by 10 hz when using a 1 Mhz signal as a? reference. This is due to 10 cycles at 1Mhz and 300 cycles at 30 Mhz, when viewed as occupying distance, are equal in lenght.
If I have bad hearing it is normally at the low or high end of the spectrum and what Jerry pointed out shows that I can still obtain the accuracy of someone with better hearing by using a higher frequency for a reference signal and if our hearing is equivalent then I simply obtain higher accuracy by using the higher frequency reference signal.
As the other gentleman pointed out being able to have accuracy that resolves to perfection is most likely not even possible because of capacitor issues that end up blocking or at least attenuating the lowest of the lows in terms of audio signals.
However, I do disagree with defining theoretical so as to indicate other than actual conditions for while the theoretical and actual may not coincide there are times that they do.
Thank you all for chipping in to this discussion brought on by my thinking out loud. Its been interesting. _._,_._,_
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Re: What does zero-beat sound like?
#ubitx
I tried the "official" calibration routine, but turned out to be VERY rough.
Two reasons for this:
a) Zero beating with loudspeaker or earphones requires that these two transducers can reproduce split-Hz tones, plus your ears can detect them.
b) The offered by the firmware calibration values are very wide.
?
What did I do after this:
1) Selected by ear two calibration values that sounded as the "best" pair in regards to zero beating.
2) Used them both and the WSJT-x software, in calibration mode, to find the two offsets (one positive the other negative if you have done a good zero beating job)
3) With the aid of the CEC manager, read the internal long calibration parameter for both cases.
4) Interpolated parameters of 3) with offsets from 2) and wrote (i.e. programmed) the new value a bit rounded, as it doesn't make any sense to seek more accuracy that the master clock's stability allows.
?
73 Nikos
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Re: boosting the power on 28 MHz
#ubitx
What no 17 meters? I heard some signals the other day coming in and they may have been from Japan. I¡¯m keeping an eye on 17 this summer. 15 meters too. ? I already looked Poland and Brazil on 15.
Joe
KD2NFC
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Show quoted text
On May 31, 2018, at 4:53 PM, Richard Spohn <wb2gxm@...> wrote:
It's all due to marketing! 10 meters is called the "Magic Band". And
everybody loves magic. - Rich WB2GXM
On 5/30/18, Bo Barry <bobarr@...> wrote:
I'm constantly surprised at the interest in 10 meters. I always check 15. If
its dead I go to 20. If it has anything on it I check 10 and hear nothing
here in NC with a simple EFHW..
But 10 was a blast back in 1954!! :)
73, Bo W4GHV since '54
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Re: boosting the power on 28 MHz
#ubitx
Like Bob Heil said. If everybody TRANSMITTED on 10m, then you may hear someone. <sic>. ? Kent ?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> On Behalf Of atouk
Sent: Thursday, May 31, 2018 6:01 PM
To: [email protected]
Subject: Re: [BITX20] boosting the power on 28 MHz #ubitx? ? 
On 5/31/2018 4:53 PM, Richard Spohn wrote: It's all due to marketing!? 10 meters is called the "Magic Band".? And everybody loves magic. - Rich WB2GXM ? On 5/30/18, Bo Barry <bobarr@...> wrote: I'm constantly surprised at the interest in 10 meters. I always check 15. If its dead I go to 20. If it has anything on it I check 10 and hear nothing here in NC with a simple EFHW.. ? But 10 was a blast back in 1954!!? ?:) ? 73, Bo W4GHV since '54 ?
? ? ?
?
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Re: boosting the power on 28 MHz
#ubitx
On 5/31/2018 4:53 PM, Richard Spohn
wrote:
toggle quoted message
Show quoted text
It's all due to marketing! 10 meters is called the "Magic Band". And
everybody loves magic. - Rich WB2GXM
On 5/30/18, Bo Barry <bobarr@...> wrote:
I'm constantly surprised at the interest in 10 meters. I always check 15. If
its dead I go to 20. If it has anything on it I check 10 and hear nothing
here in NC with a simple EFHW..
But 10 was a blast back in 1954!!? ?:)
73, Bo W4GHV since '54
|
Re: What does zero-beat sound like?
#ubitx
More from the thinkery, Mike:
TP20 should give a good meter point. There's a 0.1uF to earth there, but at low freq and Z its Z won't affect much.
..and theoretical, 'cos I don't actually have one: stalled with bitx-40 and horrific QRM at the QTH :( .
73
Dex, ZL2DEX
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The actual assembly is the same so just follow the wire up link at hfsignals.?http://www.hfsignals.com/index.php/ubitx-wire-up/
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Michael Shreeve
_Dave_ AD0B
atouk