My solution for Baofeng Mic.
Panel mount mono jacks, one 3.5 and one 2.5, from Radio Shack in store stock (could probably order online), if you turn these back to back, and butt them against each other, with the ears turned out, it is a perfect fit for spacing. ?I had posted a picture before, I will look to see if I can find it again. ?
I then use only the PTT, and the Mic element in the enclosure, enlarge the hole in front of the element, remove the speaker, and make sure the only two circuits are PTT and MIC, I removed SMD components and unnecessary trace runs by exacto knife cuts.
Works fine for me.
Craig Thibodeaux KM4YEC
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On Apr 12, 2018, at 9:30 AM, David Wilcox via Groups.Io < Djwilcox01@...> wrote:
I like your idea of an adaptor board instead of cutting off the connector. Has anyone made a small board with the double jacks on one end and a single plug on the other?
Another note: ?my Baofeng speaker mike was of such poor quality that I bought an almost identical from Btech, QHM22, a much better product for $23.00 USD. ?The speaker is top notch and reports of my voice quality are very good now. ?So the Btech mike might be a better choice for the Bitx rigs too.
Dave K8WPE On Apr 12, 2018, at 7:02 AM, Mvs Sarma via Groups.Io < mvs_sarma@...> wrote: Now a days it is difficult to gety a 2.5 and 3.5 combined plug.
As such? i humbly feelt hat instead of chopping off,? better we have a jack and plug (extension card assembly) and adopt it to original baofeng type (ebay) mic)
?regards
sarma
vu3zmv
|
Thank you! I'll have to go through my ham radio magazines to see if I have this one or if it was part of the boxes I donated to the library. tim ab0wr On Wed, 11 Apr 2018 22:57:32 -0500 "M Garza" <mgarza896@...> wrote: Tim,
I have attached the page that I think you want....
I found it here:
Hope this helps.
Marco - KG5PRT
On Wed, Apr 11, 2018 at 7:33 PM, Tim Gorman <tgorman2@...> wrote:
Any chance you could take a picture of the agc part of that article
and post it?
I gave away both my copies of that book to the local library when I
thought I wouldn't need them any longer!
tim ab0wr
On Wed, 11 Apr 2018 21:38:49 +0200
"Lawrence Galea" <9h1avlaw@...> wrote:
Also used by DL6WD Rudolf Fischer.
See ARRL Single Sideband for the Radio Amateur 1970 p193 et seq.
"An Engineer's Ham-Band Receiver"
Used in the RF amplifier with 0-60dB manual RF gain control
Regards
Lawrence
On Wed, Apr 11, 2018 at 11:45 AM, Dexter N Muir <dexy@...>
wrote:
Bill N2CQR ('Soldersmoke') has been using 2 FETs in
'series'/cascode as dual-gates. Jxxx numbers. Bog-standard,
readily available. AFAIK good NF, gain-bandwidth etc...
73
Dex, ZL2DEX
|
Re: Ian Lee KD8CEC integration of SDR demo
#ubitx
I am so glad you're developing this with Simon Brown's SDR-CONSOLE...
Simon started HRD with an FT817, PSK31 and Windows..15+ years ago, as HAM RADIO DELUXE while he was in Switzerland. HRD evolved into bigger and better till, he off loaded it off to continue his pursuits , HRD is now commercial, is still evolving? which requires a subscription. ?
Of trying the various SDR programs, SDR# HDSDR etc... I find I like? Simon Brown's? SDR-CONSOLE best. It is intuitive when first using it.? Simon is working on making it so you can assign an IP address and access it via internet remotely in Version 3.
Kudo's to KD8CEC and all the other developers of the uBITX ( Hint- hat's off to you Jim). This is the true tradition of Amateur Radio. Experimentation, building, sharing, both good and bad. Get to togethers and 807's too..
Not every ham in the world can afford a $3000 radio... The most fun I've had with ham radio in my 52 years has been with the less that $$$$ big buck radio, antenna, power levels, and so on...
Larry W8LM
|
That BF2040 is a nice part and i see a few designs with it in my future! ?The only down side for the uBITx would be its maximum operating voltage (8 volts). ?That can be engineered around obviously but there is a cost for that.?
Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it:
email:??bill@... ?
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On Apr 11, 2018, at 2:27 PM, Sandy T < windy10605@...> wrote: Since dual gate BF998 units are apparently older and either not stocked or obsolete, I would assume the BF2040 is acceptable to try (and inexpensive).
73 Kees K5BCQ?
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Skip I don't know the answer to either question - I just implemented Phillip's idea that was in his AGC adaptation. Here is a low-res photo of my connection at the board. Howard 
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I just got my ubitx and looked carefully at the motherboard. A friend who got a ubitx a month ago had the top of the 2822 mildly explode when he powered it.?
Mine has a socketed 2822 with this chip.?
I was going to modify the circuit board if it had a wx chip. But would prefer not to if it isn't needed.
google searched for the yw brand of this product with no joy.?
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I like your idea of an adaptor board instead of cutting off the connector. Has anyone made a small board with the double jacks on one end and a single plug on the other?
Another note: ?my Baofeng speaker mike was of such poor quality that I bought an almost identical from Btech, QHM22, a much better product for $23.00 USD. ?The speaker is top notch and reports of my voice quality are very good now. ?So the Btech mike might be a better choice for the Bitx rigs too.
Dave K8WPE
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On Apr 12, 2018, at 7:02 AM, Mvs Sarma via Groups.Io < mvs_sarma@...> wrote: Now a days it is difficult to gety a 2.5 and 3.5 combined plug.
As such? i humbly feelt hat instead of chopping off,? better we have a jack and plug (extension card assembly) and adopt it to original baofeng type (ebay) mic)
?regards
sarma
vu3zmv
|
If you already HAVE the Baofeng mic, AND you are still in construction phase for your enclosure, why not set up the two jacks (Mic/PTT and headphones) at the correct spacing to just plug in the Baofeng as it is??
Bob, N3FM
On Thu, Apr 12, 2018 at 8:23 AM, John <jjczon@...> wrote: They sell them on Alibaba and price isn¡¯t even that bad. Only problem is that it is a pcb mount jack so that might cause some difficulties to mount it in a case. ? John KG5WJQ ? From: [email protected] <[email protected]> On Behalf Of Mvs Sarma via Groups.Io
Sent: Thursday, April 12, 2018 6:03 AM
To: [email protected]
Subject: Re: [BITX20] Baofeng Microphones ? Now a days it is difficult to gety a 2.5 and 3.5 combined plug.
As such? i humbly feelt hat instead of chopping off,? better we have a jack and plug (extension card assembly) and adopt it to original baofeng type (ebay) mic)
?regards
sarma
vu3zmv
|
Tim,
The image with three fets is a good circuit and works abut has one significant problem
The input and output impedances are high at max attenuation.? This would terminate?
the DBM and the low pass filter very badly.? ?
It does work at audio.? BEst place for it would be between the product detector and RX preamp
as it can also be the RX pop suppression and TX audio to RX audio path suppression.
Again for RF you would have to switch it out of the transmit path or insure the TX attenuation was
"minimum".... Unless you want to implement Transmit AGC as well.
Allison
|
Hello Walt- Yes, the UTC2822m audio chop is socketed. -Paul? k9MV
|
Thanks Howard for the drawing, I also for myself drew it out last night from your description. A question is there any reason why you didn¡¯t try connecting the 1 k resistor to the wiper on the volume control and is the cap needed?
Thanks Skip NC9O
|
ARRL Single Sideband for the Radio Amateur 1970 p193 et seq.
"An Engineer's Ham-Band Receiver"
I've duplicated the PLL for another radio and copied ideas for radios I have built.
They worked very well.
Three reasons its not a fit for uBITx......
One: the MOSFets used disappeared in the late 70s.
Two: Its a narrow band front end using varicap tuning, usually called a preselector. Lots of band coils.
Three: is it would require much switching to take it out of the transmit path.
Allison
|
They sell them on Alibaba and price isn¡¯t even that bad. Only problem is that it is a pcb mount jack so that might cause some difficulties to mount it in a case. ? John KG5WJQ ?
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From: [email protected] <[email protected]> On Behalf Of Mvs Sarma via Groups.Io
Sent: Thursday, April 12, 2018 6:03 AM
To: [email protected]
Subject: Re: [BITX20] Baofeng Microphones ? Now a days it is difficult to gety a 2.5 and 3.5 combined plug.
As such? i humbly feelt hat instead of chopping off,? better we have a jack and plug (extension card assembly) and adopt it to original baofeng type (ebay) mic)
?regards
sarma
vu3zmv
|
Now a days it is difficult to gety a 2.5 and 3.5 combined plug.
As such? i humbly feelt hat instead of chopping off,? better we have a jack and plug (extension card assembly) and adopt it to original baofeng type (ebay) mic)
?regards
sarma
vu3zmv
|
I'll be in touch, Bill, but am posting the following for others who may be interested. The muting mod is on the uBitx.net site. Here is some info about the mod to get the sidetone back.
You¡¯ll see in the attached schematic that R253 is X'ed out (removed) and a 1K and .1 are in series to the yellow wire on the volume control.
?
If you are looking at the the Bitx board from the front, along the front edge just right of center is a row of SMDs. ?The first one on the right is R253. ?Remove that, then solder your cap/resistor series combination to the end where the resistor was connected that is toward the back of the board. (You can see from the trace that it is connected to C252). ?I soldered the cap to that point, with the resistor connected to the cap, then a wire to the volume control, but you could solder the wire there and attach the cap/resistor series at the volume control.)
?
Farther to the right on the schematic you can see another modification. ?That is the sidetone volume control I added, which may not be necessary. ?I believe it is a 50K or 75K pot. ?R250, which is removed for this, is in the same line of SMDs as the above. 
|
Members only.
Vince.
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On 04/12/2018 12:18 AM, M Garza wrote: Tim,
Here is the article directly from the ARRL QST Archive:
Marco - KG5PRT
On Wed, Apr 11, 2018 at 10:57 PM, M Garza <mgarza896@...
<mailto:mgarza896@...>> wrote:
Tim,
I have attached the page that I think you want....
I found it here:
<>
Hope this helps.
Marco - KG5PRT
On Wed, Apr 11, 2018 at 7:33 PM, Tim Gorman <tgorman2@...
<mailto:tgorman2@...>> wrote:
Any chance you could take a picture of the agc part of that
article and
post it?
I gave away both my copies of that book to the local library when I
thought I wouldn't need them any longer!
tim ab0wr
On Wed, 11 Apr 2018 21:38:49 +0200
"Lawrence Galea" <9h1avlaw@...
<mailto:9h1avlaw@...>> wrote:
> Also used by DL6WD Rudolf Fischer.
> See ARRL Single Sideband for the Radio Amateur 1970 p193 et seq.
> "An Engineer's Ham-Band Receiver"
> Used in the RF amplifier with 0-60dB manual RF gain control
> Regards
> Lawrence
>
> On Wed, Apr 11, 2018 at 11:45 AM, Dexter N Muir <dexy@... <mailto:dexy@...>>
> wrote:
>
> > Bill N2CQR ('Soldersmoke') has been using 2 FETs in
> > 'series'/cascode as dual-gates. Jxxx numbers. Bog-standard, readily
> > available. AFAIK good NF, gain-bandwidth etc...
> >
> > 73
> > Dex, ZL2DEX
> >
> >
> >
> >
--
Michigan VHF Corp.
|
Tim, Here is the article directly from the ARRL QST Archive:
Marco - KG5PRT
On Wed, Apr 11, 2018 at 10:57 PM, M Garza <mgarza896@...> wrote: Tim, I have attached the page that I think you want.... I found it here:
Hope this helps.
Marco - KG5PRT
|
Search eBay for ¡°50PCS BF998 998 SOT-143 12V 30MA Dual-Gate N-Channel MosFETs¡± ¡ $4.88 delivered.? ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: Like us on Facebook! ? Moderator ¨C North American QRO Group at Groups.IO. ? email:? bill@... ? ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Sandy T
Sent: Wednesday, April 11, 2018 2:27 PM
To: [email protected]
Subject: Re: [BITX20] AGC circuit to try? ? Since dual gate BF998 units are apparently older and either not stocked or obsolete, I would assume the BF2040 is acceptable to try (and inexpensive).
73 Kees K5BCQ?
|
Tim, I have attached the page that I think you want.... I found it here:
Hope this helps.
Marco - KG5PRT
On Wed, Apr 11, 2018 at 7:33 PM, Tim Gorman <tgorman2@...> wrote: Any chance you could take a picture of the agc part of that article and
post it?
I gave away both my copies of that book to the local library when I
thought I wouldn't need them any longer!
tim ab0wr
On Wed, 11 Apr 2018 21:38:49 +0200
"Lawrence Galea" <9h1avlaw@...> wrote:
> Also used by DL6WD Rudolf Fischer.
> See ARRL Single Sideband for the Radio Amateur 1970 p193 et seq.
> "An Engineer's Ham-Band Receiver"
> Used in the RF amplifier with 0-60dB manual RF gain control
> Regards
> Lawrence
>
> On Wed, Apr 11, 2018 at 11:45 AM, Dexter N Muir <dexy@...>
> wrote:
>
> > Bill N2CQR ('Soldersmoke') has been using 2 FETs in
> > 'series'/cascode as dual-gates. Jxxx numbers. Bog-standard, readily
> > available. AFAIK good NF, gain-bandwidth etc...
> >
> > 73
> > Dex, ZL2DEX
> >
> >
> >
> >
|
That¡¯s what I did and it works fine for me.?
K2cpu
On Wed, Apr 11, 2018 at 10:21 PM < n2tmc@...> wrote: When using a Baofeng mike, can you just slice off the small plug for the speaker mike and just go on your merry way?
TNX
George
N2TMC
|
Craig Thibodeaux
K9HZ
_Dave_ AD0B
Skip Davis