Date   
Re: directions for using ubitx memory manager

Ian Lee
 

Paul
Since version 1.0, we have posted all the distribution in the release section of github.
Version 1.01 can also be found here.
Version 1.03, which I will upload later, will also be registered here.

git release
https://github.com/phdlee/ubitx/releases

And the related explanatory materials are mainly posted below.

Thank you for using CEC Firmware.

Ian KD8CEC




2018-04-12 10:52 GMT+09:00 Paul Schumacher via Groups.Io <wnpauls@...>:

I am having difficulty finding directions for using the ubitx memory manager
v 1.01. 

Any help will be appreciated.

thanks,  Paul K0ZYV



--
Best 73
KD8CEC / Ph.D ian lee
kd8cec@...
www.hamskey.com (my blog)

Re: uBitx just started transmitting a loud hum #ubitx-help

James
 

Great news and many many thanks to all.
I have soldered in the new electret and I've got no hum on transmission, and very good audio reports!

This one is now solved!

Next task is an rtlsdr waterfall display!
Cheers and thanks for the help!
James

Re: AGC circuit to try?

cove37
 

Good point on the matching.  Yes, that app note is full of fun stuff.

Re: uBITX shipping time

VE7CWS WRSeiler <waltrseiler@...>
 

Hello Paul 

is is your audio chip socketed ?

cheers Walt VE7CWS

Re: Baofeng Microphones

Ben Piecora
 

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

--
Ben
K2CPU

Re: AGC circuit to try?

M Garza <mgarza896@...>
 

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: AGC circuit to try?

K9HZ <bill@...>
 

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 – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com

Like us on Facebook! facebook icon

 

Moderator – North American QRO Group at Groups.IO.

 

email:  bill@...

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Sandy T
Sent: Wednesday, April 11, 2018 2:27 PM
To: BITX20@groups.io
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 


Virus-free. www.avg.com

Re: AGC circuit to try?

M Garza <mgarza896@...>
 

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:

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: AGC circuit to try?

Vince Vielhaber
 

Members only.

Vince.

On 04/12/2018 12:18 AM, M Garza wrote:
Tim,
Here is the article directly from the ARRL QST Archive:
http://p1k.arrl.org/pubs_archive/62188

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:
http://hobbydocbox.com/Radio/70955037-Ssb-transceiver-sol-idmstate-80-me-er-this-month-maqaziqe-focus-on-communications-technology-i-march-1973.html#show_full_text
<http://hobbydocbox.com/Radio/70955037-Ssb-transceiver-sol-idmstate-80-me-er-this-month-maqaziqe-focus-on-communications-technology-i-march-1973.html#show_full_text>

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
> >
> >
> >
> >






Re: Audio pop on CW

K4LXY
 

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.

Re: Baofeng Microphones

Mvs Sarma <mvs_sarma@...>
 

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

Re: Baofeng Microphones

John
 

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: BITX20@groups.io <BITX20@groups.io> On Behalf Of Mvs Sarma via Groups.Io
Sent: Thursday, April 12, 2018 6:03 AM
To: BITX20@groups.io
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

Re: AGC circuit to try?

ajparent1 <kb1gmx@...>
 

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

Re: Audio pop on CW

Skip Davis
 

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

Re: uBITX shipping time

Paul k9mv
 

Hello Walt-
Yes, the UTC2822m audio chop is socketed.
-Paul  k9MV

Re: AGC circuit to try?

ajparent1 <kb1gmx@...>
 

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

Re: Baofeng Microphones

Bob Smallwood
 

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: BITX20@groups.io <BITX20@groups.io> On Behalf Of Mvs Sarma via Groups.Io
Sent: Thursday, April 12, 2018 6:03 AM
To: BITX20@groups.io
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


Re: Baofeng Microphones

David Wilcox
 

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

YW brand 2822 #ubitx

_Dave_ K0MBT
 

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. 
http://veloliner.com/ham/yw2822socketed.JPG

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. 

Re: Audio pop on CW

K4LXY
 

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