See if the Wolfwave audio DSP filter will help. DXEngineering. - Rich WB2GXM
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On 8/12/19, _Dave_ K0MBT <davesters@...> wrote: Hello
I am teaching myself CW and find that the receive filters are too wide even
when in cwl or cwu. Many times I hear 3 or 4 signals and it becomes
confusing to my new CW ears and older brain.
Has any on designed an IF filter that would be suitable for cw?
I have a v3 and v4 uBITX's Running kd8cec firmware and Nextion displays.
Thanks
Dave
k0mbt
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Re: Antuino now available for purchase
Order placed - looking forward to it.? Thanks Ashar!
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I tend to like a wide bandwidth for my CW if the interference
isn't ghastly. An extra signal peeping along up there at 2 kHz or
so doesn't bother me unless it's HUUUGE. I set myself the
challenge of doing a CWT contest with the uBITX - stock filtering
- and it was do-able - sometimes moving the headphones around
helped me discern the wanted signal a little better.
Of course there's a time and place for a narrow filter - really
weak stuff or a really busy contest.
I might borrow the one from the QCX - quite nice.
John K0JD
On 8/12/2019 10:29, Curt via Groups.Io
wrote:
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Dave
Funny how many of us could do cw with 3 khz or wider filtering
decades ago, when a narrow filter cost maybe as much as our
receiver.
The design of the ubitx with its bidirectional amplifiers does not
easily allow adding a second xtal filter for cw nor IF agc. So
think audio filtering.
I use a NESCAF audio filter that features adjustable bandwidth for
cw and ssb. And it adds a lm386 audio amplifier output. Mine is
external,? but I plan to integrate it. 4state qrp has a narrow cw
filter. Kc9on has the CALF audio filter, a bit large but nice
audio filter to use with several different rigs.
A cw filter much more important than agc. Being able to easily
switch back to ssb is desirable.
Curt
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Re: What is the current version board? I have been away from the forum for awhile
Ubitx version 5. It has reduced transmit spurious, and a different audio amplifier.? Still way cool transceiver.
Curt
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Dave
Funny how many of us could do cw with 3 khz or wider filtering decades ago, when a narrow filter cost maybe as much as our receiver.
The design of the ubitx with its bidirectional amplifiers does not easily allow adding a second xtal filter for cw nor IF agc. So think audio filtering.
I use a NESCAF audio filter that features adjustable bandwidth for cw and ssb. And it adds a lm386 audio amplifier output. Mine is external,? but I plan to integrate it. 4state qrp has a narrow cw filter. Kc9on has the CALF audio filter, a bit large but nice audio filter to use with several different rigs.
A cw filter much more important than agc. Being able to easily switch back to ssb is desirable.
Curt
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Re: Zero beating / calibration using old Drake method
My wife is still a novice although they changed her call from WN3ZZM to WA3ZZM!
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Hello
I am teaching myself CW and find that the receive filters are too wide even when in cwl or cwu. Many times I hear 3 or 4 signals and it becomes confusing to my new CW ears and older brain.
Has any on designed an IF filter that would be suitable for cw?
I have a v3 and v4 uBITX's Running kd8cec firmware and Nextion displays.
Thanks
Dave
k0mbt
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Re: Antuino now available for purchase
Mike, we calibrate it using a reference 10 mhz by zero beating it. The calibration may slip. It is best to calibrate it with WWV.
One other question. Can the 10 MHz output be used as a frequency source for calibration purposes?
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What is the current version board? I have been away from the forum for awhile
Any new features or bug fixes?
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Re: Zero beating / calibration using old Drake method
I found this interesting:
I remember a lot of those milestones in the 70s..getting a WD call as a novice (WD8QXM), as opposed to a WN call was still kind of a new thing.
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Re: AGC Circuit for uBITX Featured in July 2019 QST Magazine
All caps have a rated voltage. That is the max voltage you apply to it. If you exceed this voltage the insulation between the "plates" of the cap will break down and the magical smoke will be released out of it. It will blow. Alliminium? caps are very sensitive to this max voltage. Therefore the max voltages are printed on them so you are can be aware of it. And the circuit designer also jods it down on the cct diagram. If your supply voltage is say 12V, it is safe to use a 16V rated cap. You do then have a safety margin for 'n slight mishap in the supply voltage if it occur. The cap will only charge up to the supply voltage. So using a higher voltage rated cap will make no difference. The cap can not generate a higher voltage than what is supplied to it. Your safety margin will just be greater. Using a 50V cap in a 12V system ? So what. The capacitance of the cap is worth watching and to adhere to. Also the voltage rating of the cap determines its fiscall? dimensions.? J van der Merwe
On Mon, 12 Aug 2019, 12:21 David Wilcox via Groups.Io <Djwilcox01= [email protected]> wrote: Can someone explain the reasons for certain voltages listed on any schematic for the electrolytic caps, AND what problems could arise if one used a cap with a larger voltage rating? How much higher a voltage cap could be substituted without causing a problem?
Dave K8WPE? David J. Wilcox K8WPE¡¯s iPad Since the entire circuit set is 12V or less, your 16V caps should work just fine. ? ? From: [email protected] [mailto:[email protected]] On Behalf Of Rob French (KC4UPR)
Sent: Monday, August 12, 2019 12:40 AM
To: [email protected]
Subject: Re: [BITX20] AGC Circuit for uBITX Featured in July 2019 QST Magazine ? Thanks.? Any thoughts on voltage rating for the capacitors, especially the "big" electrolytic ones?? (10uF, 100uF, 470uF... I'm assuming they're electrolytics.)? I looked at the Hycas schematic, and that calls out 50v for all the caps, but I don't have many of those... got lots of 16v though! -- ¡_. _._
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Re: Antuino now available for purchase
One other question. Can the 10 MHz output be used as a frequency source for calibration purposes?
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Re: Antuino now available for purchase
Thanks. I had already ordered it and saw the video of it not in a case. Now I can sell my MFJ-259.?
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Re: Antuino now available for purchase
It is a fully tested unit in the all metal case. It has an internal battery case for 6 AA cells. Two SMA connectors.
Does it come with the case?
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Re: Antuino now available for purchase
Does it come with the case?
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Re: AGC Circuit for uBITX Featured in July 2019 QST Magazine
The voltage rating on the capacitor is the maximum the component can ¡°deal with¡±. It works absolutely fine at lower voltages of course and it is best to give some headroom for example on a 12v rail,use 16v capacitors.
There is no problem going up to say 25 or higher voltage rating,just expect a physically larger component which might not fit in the desired space.
Electrolytics are happiest when run at 50%? and above of their stated voltage, they tend to deteriorate if say a 100v component is used on a 12v rail. The low voltage in comparison to their rating does not properly keep the component and
its chemicals in proper balance.
?
This is why equipment not used for some considerable time needs careful powering up because of the deterioration of electrolytics deprived of polarising voltage.
?
For a 12v DC ?rail use 16v or 25v components.
?
Hope this helps
?
Ian M0IDR
?
Sent from for Windows 10
?
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Can someone explain the reasons for certain voltages listed on any schematic for the electrolytic caps, AND what problems could arise if one used a cap with a larger voltage rating? How much higher a voltage cap could be substituted without causing a problem?
Dave K8WPE?
David J. Wilcox K8WPE¡¯s iPad
Since the entire circuit set is 12V or less, your 16V caps should work just fine.
?
?
From:
[email protected] [mailto:[email protected]]
On Behalf Of Rob French (KC4UPR)
Sent: Monday, August 12, 2019 12:40 AM
To: [email protected]
Subject: Re: [BITX20] AGC Circuit for uBITX Featured in July 2019 QST Magazine
?
Thanks.? Any thoughts on voltage rating for the capacitors, especially the "big" electrolytic ones?? (10uF, 100uF, 470uF... I'm assuming they're electrolytics.)? I looked at the Hycas schematic, and that calls out 50v for all the caps,
but I don't have many of those... got lots of 16v though!
--
¡_. _._
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Re: AGC Circuit for uBITX Featured in July 2019 QST Magazine
Can someone explain the reasons for certain voltages listed on any schematic for the electrolytic caps, AND what problems could arise if one used a cap with a larger voltage rating? How much higher a voltage cap could be substituted without causing a problem?
Dave K8WPE? David J. Wilcox K8WPE¡¯s iPad
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On Aug 12, 2019, at 2:18 AM, MadRadioModder < madradiomodder@...> wrote: Since the entire circuit set is 12V or less, your 16V caps should work just fine. ? ? From: [email protected] [mailto:[email protected]] On Behalf Of Rob French (KC4UPR)
Sent: Monday, August 12, 2019 12:40 AM
To: [email protected]
Subject: Re: [BITX20] AGC Circuit for uBITX Featured in July 2019 QST Magazine ? Thanks.? Any thoughts on voltage rating for the capacitors, especially the "big" electrolytic ones?? (10uF, 100uF, 470uF... I'm assuming they're electrolytics.)? I looked at the Hycas schematic, and that calls out 50v for all the caps, but I don't have many of those... got lots of 16v though! -- ¡_. _._
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Re: Antuino now available for purchase
Good news. Everyone has been waiting. Thank you.
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Antuino now available for purchase
Good work Ashar!
http://www.hfsignals.com/index.php/antuino/
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Jim
_Dave_ AD0B
Kobus ZS6CHK
David Wilcox K8WPE