Hi Wayne,
Shielding can be added to the interior of those "attractive plastic boxes". I made my own steel box from new steel. But I have used the aluminum foil lining inside wood or plastic boxes, The heavier foil pans that are sold for baking or the ones frozen meals come in are much sturdier than the paper thin foil sold for wrapping food.
73,
Bill KU8H
toggle quoted message
Show quoted text
On 11/9/18 5:20 PM, Lawrence Galea wrote: Have you tried putting the amplifier on the back panel?
On Fri, Nov 9, 2018 at 5:59 AM Wayne Leake <wayneleake@... <mailto:wayneleake@...>> wrote:
?Regarding the shielded enclosures, yup, most good radios are
enclosed in metal cases.
?Receiver only is far less fussy.
?I was looking at a number of possible cases for my BITX, and
decided on a BUD enclosure, all aluminum
?It is big enough for the HF Signal BITX40, but turns out not for
another BITX I am assembling.
?Boards too wide to fit both exciter and PA boards in it.
?I see all these great looking plastic cases, but figured that I do
not want to go with no shielding.
?Hence the one that will go into a cassette? deck case will have
shielding.
?The ferrite beads have their places, but don't take the place of
good shielding, which may also help prevent images and harmonics ,
plus spurs, from escaping.
?YMMV
?Wayne WA2YNE
--
bark less - wag more
|
Farhan,
Your doing what I tried back in June/July time frame, it failed then.
Reason first series traps good enough to suck out the spur at a given frequency
are narrow enough? to be only a spot frequency fix.? The 2IF-LO spur for 28mhz
BAND is between 17 to 16 mhz for 10M alone.? So you need a series trap that
can not do a band.
The other issue is the power amp.? At 80M and 10W out the gain is about 60db
but as you go up, at 20M the gain is down to ~56db, and at 10M the gain is maybe
~52DB.? ?So at the spur frequency you have more gain available than the desired
output frequency and the differential gain is enough to put that spur as shown at
-45db at more like -37db below 2W.
The fix has to be more comprehensive.? Also it must be field verifiable or factory
set to allow for 1 or 5% parts.
The 45mhz section needs:
? 45mhz filter inductors shielded or better that section relocated.
? Amplifier distortion clean up.
? Swap the 45mhz port and LO ports as IF ports are most sensitive to mismatch.
A thought to look into...
? Replace the TIA amp at 45mhz with a more common resistive feedback amp (typical 2n5109 amp)
? with 20db gain.? Here is the hint:? Often when that amp is shown due to the fact that changes at either
? port impact the opposing port they often have a 6db pad at the output.? However for the TX case that
? same pad can be at the input and it insures the 45mhz filter will have a good match for the network
? and the transistor with its input impedance stable will have output stability going to the mixer.
Allison
|
Have you tried putting the amplifier on the back panel?
?Regarding the shielded enclosures, yup, most good radios are enclosed in metal cases.
?Receiver only is far less fussy. ?I was looking at a number of possible cases for my BITX, and decided on a BUD enclosure, all aluminum ?It is big enough for the HF Signal BITX40, but turns out not for another BITX I am assembling. ?Boards too wide to fit both exciter and PA boards in it. ?I see all these great looking plastic cases, but figured that I do not want to go with no shielding. ?Hence the one that will go into a cassette? deck case will have shielding. ?The ferrite beads have their places, but don't take the place of good shielding, which may also help prevent images and harmonics , plus spurs, from escaping. ?YMMV ?Wayne WA2YNE
|
Re: DIGITAL FREQUENCY READOUT
I WANT TO BUY? "The Raduino board with Si5351, Arduino Nano. Fully tested AND PROGRAMMED." I DON'T NEED THE LCD READOUT.
HOW MUCH AND WHERE CAN I ORDER?
WILLIAM
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Show quoted text
On 11/9/2018 1:32 PM, MONEYSMITH wrote: THANK YOU
On 11/9/2018 1:21 PM, Vince Vielhaber wrote:
The crystal is on the green board under the display.? Unplug the display and you'll see it.
Vince.
On 11/09/2018 03:26 PM, MONEYSMITH wrote:
THIS BOARD HAS A MEGA328P CHIP. I HAVE NO INFORMATION ON THE BOARD.
I FOUND NO SI5351A CHIP?
PHOTOS ATTACHED.
W4NFR
On 11/9/2018 11:42 AM, Arv Evans wrote:
Bill W4NFR
The picture you provided is the back side of an Arduino Nano board.
The crystals on this PCB
have nothing to do with the transmitting frequency of your
transceiver.? The SI5351a frequency
synthesizer is a small 10-pin MSOP IC, or 20-pin QFN IC.? It should be
clearly labeled on the
top as an Si5351A device.? Do you have a picture of the Raduino board
with its Si5351A chip
and crystal?
Arv? K7HKL
_._
On Fri, Nov 9, 2018 at 11:20 AM MONEYSMITH <w4nfr@...
<mailto:w4nfr@...>> wrote:
??? HERE IS A PHOTO OF BOARD AND CRYSTAL.
??? W4NFR
??? On 11/9/2018 9:57 AM, Mvs Sarma wrote:
??? OMG. acidentally crept in perhaps .
??? could you please share a? photo please, !!!!!
??? regards
??? sarma
???? vu3zmv
??? On Fri, Nov 9, 2018 at 10:50 PM MONEYSMITH <w4nfr@...
??? <mailto:w4nfr@...>> wrote:
??????? I OPENED UP MY uBITX? AND TOOK A LOOK AT THE S1535A BOARD.
??????? THE CRYSTAL HAS 20.0 STAMPED ON IT INSTEAD OF 25.0 MHZ?
??????? On 11/8/2018 5:59 PM, RCC WB5YYM wrote:
??????? The crystal is not "bad"
------------------------------------------------------------------------
??????? AVG logo <>
??????? This email has been checked for viruses by AVG antivirus
??????? software.
??????? www.avg.com <>
<#m_4175695945886965737_m_2844835715575407798_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
---
This email has been checked for viruses by AVG.
|
Re: DIGITAL FREQUENCY READOUT
THANK YOU On 11/9/2018 1:21 PM, Vince Vielhaber wrote: The crystal is on the green board under the display.? Unplug the display and you'll see it.
Vince.
On 11/09/2018 03:26 PM, MONEYSMITH wrote:
THIS BOARD HAS A MEGA328P CHIP. I HAVE NO INFORMATION ON THE BOARD.
I FOUND NO SI5351A CHIP?
PHOTOS ATTACHED.
W4NFR
On 11/9/2018 11:42 AM, Arv Evans wrote:
Bill W4NFR
The picture you provided is the back side of an Arduino Nano board.
The crystals on this PCB
have nothing to do with the transmitting frequency of your
transceiver.? The SI5351a frequency
synthesizer is a small 10-pin MSOP IC, or 20-pin QFN IC.? It should be
clearly labeled on the
top as an Si5351A device.? Do you have a picture of the Raduino board
with its Si5351A chip
and crystal?
Arv? K7HKL
_._
On Fri, Nov 9, 2018 at 11:20 AM MONEYSMITH <w4nfr@...
<mailto:w4nfr@...>> wrote:
??? HERE IS A PHOTO OF BOARD AND CRYSTAL.
??? W4NFR
??? On 11/9/2018 9:57 AM, Mvs Sarma wrote:
??? OMG. acidentally crept in perhaps .
??? could you please share a? photo please, !!!!!
??? regards
??? sarma
???? vu3zmv
??? On Fri, Nov 9, 2018 at 10:50 PM MONEYSMITH <w4nfr@...
??? <mailto:w4nfr@...>> wrote:
??????? I OPENED UP MY uBITX? AND TOOK A LOOK AT THE S1535A BOARD.
??????? THE CRYSTAL HAS 20.0 STAMPED ON IT INSTEAD OF 25.0 MHZ?
??????? On 11/8/2018 5:59 PM, RCC WB5YYM wrote:
??????? The crystal is not "bad"
------------------------------------------------------------------------
??????? AVG logo <>
??????? This email has been checked for viruses by AVG antivirus
??????? software.
??????? www.avg.com <>
<#m_4175695945886965737_m_2844835715575407798_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
--- This email has been checked for viruses by AVG.
|
Re: DIGITAL FREQUENCY READOUT
The crystal is on the green board under the display. Unplug the display and you'll see it.
Vince.
toggle quoted message
Show quoted text
On 11/09/2018 03:26 PM, MONEYSMITH wrote: THIS BOARD HAS A MEGA328P CHIP. I HAVE NO INFORMATION ON THE BOARD.
I FOUND NO SI5351A CHIP?
PHOTOS ATTACHED.
W4NFR
On 11/9/2018 11:42 AM, Arv Evans wrote:
Bill W4NFR
The picture you provided is the back side of an Arduino Nano board.
The crystals on this PCB
have nothing to do with the transmitting frequency of your
transceiver. The SI5351a frequency
synthesizer is a small 10-pin MSOP IC, or 20-pin QFN IC. It should be
clearly labeled on the
top as an Si5351A device. Do you have a picture of the Raduino board
with its Si5351A chip
and crystal?
Arv K7HKL
_._
On Fri, Nov 9, 2018 at 11:20 AM MONEYSMITH <w4nfr@...
<mailto:w4nfr@...>> wrote:
HERE IS A PHOTO OF BOARD AND CRYSTAL.
W4NFR
On 11/9/2018 9:57 AM, Mvs Sarma wrote:
OMG. acidentally crept in perhaps .
could you please share a photo please, !!!!!
regards
sarma
vu3zmv
On Fri, Nov 9, 2018 at 10:50 PM MONEYSMITH <w4nfr@...
<mailto:w4nfr@...>> wrote:
I OPENED UP MY uBITX AND TOOK A LOOK AT THE S1535A BOARD.
THE CRYSTAL HAS 20.0 STAMPED ON IT INSTEAD OF 25.0 MHZ?
On 11/8/2018 5:59 PM, RCC WB5YYM wrote:
The crystal is not "bad"
------------------------------------------------------------------------
AVG logo <>
This email has been checked for viruses by AVG antivirus
software.
www.avg.com <>
<#m_4175695945886965737_m_2844835715575407798_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
--
K8ZW
|
Yup.? it is correct.? The easiest way to get the units right is? L in uH , C in uF and result will be in Mhz? ie recip of sqrt of micro x micro .
But remember when you are working at VHF with 5 percent capacitors and air wound coils,? even Tiny errors or tolerances? will put you off by 100s of KHz.? Ditto temperature effects on components.
? Timothy E. Fidler : Engineer BE Mech(1) Auckland , NDT specialist AINDT UT /RT3 , MT2 CB #2885,?
Telephone Whangarei?? 022? 691 8405
e: Engstr@...
----- Original Message -----
To: <[email protected]>
Cc:
Sent: Fri, 09 Nov 2018 12:49:44 -0800
Subject: Re: [BITX20] a simple spur fix
10pf series with .3uhy - resonant about 91 MHz
47pf series with 5.0uhy resonant about 10.4 MHz
Is this correct?
Brian - WA5RDG
|
Ashhar: ? You give the number of turns necessary, and the core IDs, but what is the gauge of wire used??? ? David A Posthuma, WD8PUO 1 (616) 283-7703 ?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> On Behalf Of Ashhar Farhan
Sent: Friday, November 09, 2018 10:35 AM
To: [email protected]
Subject: [BITX20] a simple spur fix ? so, there is one spur fix that is now consistently working for me. among rhe solutions, i was looking for one that would be easy to apply. first, the distortion in the 45 mhz amp is creating harmonic distortion. so a 0.3uh in series with a 10 pf is used across TP13 (output of the 45 MHz IF amp going to the front end mixer). 8 turns on T30-6 gives you 300nh. second, there is a cross talk inside the Si5351 where the 12 mhz from the bfo leaks into the local oscillator. A 5uh in series with a 47 pf across C202 of the LPF will suppress it. 35 turns on T30-6 gives you 5uh.
|
Re: DIGITAL FREQUENCY READOUT
The Si5351 is on the back side of the board in the first picture, between the display and the board that the ATmeg board plugs into.? The board with the plug is the Raduino board.
On Fri, Nov 9, 2018 at 2:27 PM MONEYSMITH < w4nfr@...> wrote:
THIS BOARD HAS A MEGA328P CHIP. I HAVE NO INFORMATION ON THE
BOARD.
I FOUND NO SI5351A CHIP?
PHOTOS ATTACHED.
W4NFR
On 11/9/2018 11:42 AM, Arv Evans wrote:
Bill
W4NFR
The
picture you provided is the back side of an Arduino Nano
board.? The crystals on this PCB
have
nothing to do with the transmitting frequency of your
transceiver.? The SI5351a frequency
synthesizer
is a small 10-pin MSOP IC, or 20-pin QFN IC.? It should be
clearly labeled on the
top
as an Si5351A device.? Do you have a picture of the Raduino
board with its Si5351A chip
and
crystal?
Arv?
K7HKL
_._
On Fri, Nov 9, 2018 at 11:20 AM MONEYSMITH < w4nfr@...>
wrote:
HERE IS A PHOTO OF BOARD AND CRYSTAL.
W4NFR
On
11/9/2018 9:57 AM, Mvs Sarma wrote:
OMG. acidentally crept in perhaps .
could you please share a? photo please, !!!!!
regards
sarma
?vu3zmv
On Fri, Nov 9, 2018 at 10:50 PM
MONEYSMITH < w4nfr@...>
wrote:
I OPENED UP MY uBITX? AND TOOK A LOOK AT THE
S1535A BOARD. THE CRYSTAL HAS 20.0 STAMPED ON IT
INSTEAD OF 25.0 MHZ?
On
11/8/2018 5:59 PM, RCC WB5YYM wrote:
The crystal is not "bad"?
| |
This email has been checked for viruses
by AVG antivirus software.
|
|
10pf series with .3uhy - resonant about 91 MHz
47pf series with 5.0uhy resonant about 10.4 MHz
Is this correct?
Brian - WA5RDG
|
Re: DIGITAL FREQUENCY READOUT
THIS BOARD HAS A MEGA328P CHIP. I HAVE NO INFORMATION ON THE
BOARD.
I FOUND NO SI5351A CHIP?
PHOTOS ATTACHED.
W4NFR
On 11/9/2018 11:42 AM, Arv Evans wrote:
toggle quoted message
Show quoted text
Bill
W4NFR
The
picture you provided is the back side of an Arduino Nano
board.? The crystals on this PCB
have
nothing to do with the transmitting frequency of your
transceiver.? The SI5351a frequency
synthesizer
is a small 10-pin MSOP IC, or 20-pin QFN IC.? It should be
clearly labeled on the
top
as an Si5351A device.? Do you have a picture of the Raduino
board with its Si5351A chip
and
crystal?
Arv?
K7HKL
_._
On Fri, Nov 9, 2018 at 11:20 AM MONEYSMITH < w4nfr@...>
wrote:
HERE IS A PHOTO OF BOARD AND CRYSTAL.
W4NFR
On
11/9/2018 9:57 AM, Mvs Sarma wrote:
OMG. acidentally crept in perhaps .
could you please share a? photo please, !!!!!
regards
sarma
?vu3zmv
On Fri, Nov 9, 2018 at 10:50 PM
MONEYSMITH < w4nfr@...>
wrote:
I OPENED UP MY uBITX? AND TOOK A LOOK AT THE
S1535A BOARD. THE CRYSTAL HAS 20.0 STAMPED ON IT
INSTEAD OF 25.0 MHZ?
On
11/8/2018 5:59 PM, RCC WB5YYM wrote:
The crystal is not "bad"?
| |
This email has been checked for viruses
by AVG antivirus software.
|
|
Ooops, hit the wrong key. Yes, 100 nF.
|
Re: Need Source for Baofeng Mic Sockets
|
Re: DIGITAL FREQUENCY READOUT
look in your software and see what frequency is set for the crystal. use a script that puts the oscillator right on a known frequency (best to use the crystal frequency) calculate how far off it is, calculte the real crystal frequency adjust your software. or use the calibration method specific to the firmware you have chosen, if you aren't able to do the above. All mine have been 3-4 kilohertz off from the crystals "stated"' frequency. Putting in the correct constant for the effective true oscillation frequency of the crystal clock is a huge step toward having accurate frequencies. Then set your BFO if needed. This is really a short-kit and you have to apply some of your "ham-smarts" to make things work correctly. Because you studied and passed a ham radio license exam, you're one of the few people who are enabled to make such changes to your own amateur radio gear! Take advantage and develop your knowledge and skills!!! Gordon ________________________________________ From: [email protected] < [email protected]> on behalf of Vince Vielhaber <vev@...> Sent: Friday, November 9, 2018 2:55 PM To: [email protected]Subject: Re: [BITX20] DIGITAL FREQUENCY READOUT To see the 25MHz xtal on mine I had to pull the display. Vince. On 11/09/2018 02:42 PM, Arv Evans wrote: Bill W4NFR
The picture you provided is the back side of an Arduino Nano board. The
crystals on this PCB
have nothing to do with the transmitting frequency of your transceiver.
The SI5351a frequency
synthesizer is a small 10-pin MSOP IC, or 20-pin QFN IC. It should be
clearly labeled on the
top as an Si5351A device. Do you have a picture of the Raduino board
with its Si5351A chip
and crystal?
Arv K7HKL
_._
On Fri, Nov 9, 2018 at 11:20 AM MONEYSMITH <w4nfr@...
<mailto:w4nfr@...>> wrote:
HERE IS A PHOTO OF BOARD AND CRYSTAL.
W4NFR
On 11/9/2018 9:57 AM, Mvs Sarma wrote:
OMG. acidentally crept in perhaps .
could you please share a photo please, !!!!!
regards
sarma
vu3zmv
On Fri, Nov 9, 2018 at 10:50 PM MONEYSMITH <w4nfr@...
<mailto:w4nfr@...>> wrote:
I OPENED UP MY uBITX AND TOOK A LOOK AT THE S1535A BOARD. THE
CRYSTAL HAS 20.0 STAMPED ON IT INSTEAD OF 25.0 MHZ?
On 11/8/2018 5:59 PM, RCC WB5YYM wrote:
The crystal is not "bad"
------------------------------------------------------------------------
AVG logo <>
This email has been checked for viruses by AVG antivirus
software.
www.avg.com <>
<#m_4175695945886965737_m_2844835715575407798_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
-- K8ZW
|
Re: DIGITAL FREQUENCY READOUT
To see the 25MHz xtal on mine I had to pull the display.
Vince.
toggle quoted message
Show quoted text
On 11/09/2018 02:42 PM, Arv Evans wrote: Bill W4NFR
The picture you provided is the back side of an Arduino Nano board. The
crystals on this PCB
have nothing to do with the transmitting frequency of your transceiver.
The SI5351a frequency
synthesizer is a small 10-pin MSOP IC, or 20-pin QFN IC. It should be
clearly labeled on the
top as an Si5351A device. Do you have a picture of the Raduino board
with its Si5351A chip
and crystal?
Arv K7HKL
_._
On Fri, Nov 9, 2018 at 11:20 AM MONEYSMITH <w4nfr@...
<mailto:w4nfr@...>> wrote:
HERE IS A PHOTO OF BOARD AND CRYSTAL.
W4NFR
On 11/9/2018 9:57 AM, Mvs Sarma wrote:
OMG. acidentally crept in perhaps .
could you please share a photo please, !!!!!
regards
sarma
vu3zmv
On Fri, Nov 9, 2018 at 10:50 PM MONEYSMITH <w4nfr@...
<mailto:w4nfr@...>> wrote:
I OPENED UP MY uBITX AND TOOK A LOOK AT THE S1535A BOARD. THE
CRYSTAL HAS 20.0 STAMPED ON IT INSTEAD OF 25.0 MHZ?
On 11/8/2018 5:59 PM, RCC WB5YYM wrote:
The crystal is not "bad"
------------------------------------------------------------------------
AVG logo <>
This email has been checked for viruses by AVG antivirus
software.
www.avg.com <>
<#m_4175695945886965737_m_2844835715575407798_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
--
K8ZW
|
I wondered about the cross-talk in the Si5351.? There have been a number of papers written on it being problematic¡ to the point of suggesting using only one channel of the Si5351 but multiple parts if you need more frequencies.? Channel separation in some cases is only in the 30ish dB range¡ ? ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Ashhar Farhan
Sent: Friday, November 9, 2018 9:35 AM
To: [email protected]
Subject: [BITX20] a simple spur fix ? so, there is one spur fix that is now consistently working for me. among rhe solutions, i was looking for one that would be easy to apply. first, the distortion in the 45 mhz amp is creating harmonic distortion. so a 0.3uh in series with a 10 pf is used across TP13 (output of the 45 MHz IF amp going to the front end mixer). 8 turns on T30-6 gives you 300nh. second, there is a cross talk inside the Si5351 where the 12 mhz from the bfo leaks into the local oscillator. A 5uh in series with a 47 pf across C202 of the LPF will suppress it. 35 turns on T30-6 gives you 5uh. -- ¡_. _._
|
Re: DIGITAL FREQUENCY READOUT
Bill W4NFR
The picture you provided is the back side of an Arduino Nano board.? The crystals on this PCB have nothing to do with the transmitting frequency of your transceiver.? The SI5351a frequency
synthesizer is a small 10-pin MSOP IC, or 20-pin QFN IC.? It should be clearly labeled on the
top as an Si5351A device.? Do you have a picture of the Raduino board with its Si5351A chip and crystal?
Arv? K7HKL _._
On Fri, Nov 9, 2018 at 11:20 AM MONEYSMITH < w4nfr@...> wrote:
HERE IS A PHOTO OF BOARD AND CRYSTAL.
W4NFR
On 11/9/2018 9:57 AM, Mvs Sarma wrote:
OMG. acidentally crept in perhaps .
could you please share a? photo please, !!!!!
regards
sarma
?vu3zmv
On Fri, Nov 9, 2018 at 10:50 PM MONEYSMITH < w4nfr@...>
wrote:
I OPENED UP MY uBITX? AND TOOK A LOOK AT THE S1535A
BOARD. THE CRYSTAL HAS 20.0 STAMPED ON IT INSTEAD OF 25.0
MHZ?
On
11/8/2018 5:59 PM, RCC WB5YYM wrote:
The crystal is not "bad"?
| |
This email has been checked for viruses by AVG
antivirus software.
|
|
Excellent!
So no second 45mhz filter, no surface mount inductors at L5,L7,? L1,L2,L3,L4 ?
TP13 is not shown in the v3 schematics, only in the v4 schematics.
I assume these mods work will work on the v3 boards too.
TP13 is the node at T2-pin3 in the first mixer.
I assume "across TP13" means that we add the cap and inductor in series from that node to ground.
Will be interesting to see if it matters where we physically place it, at T2-pin3 would be nice
because it could be added to the bottom of the board directly to the ground plane.
The second series cap and inductor get placed across C202, in the middle of the 30mhz low pass filter
on the far left side of the schematic.
So just leave C202 as it was, but add the cap and inductor from
the through hole pin for L2 (or L3) to the ground plane.
Will be interesting to see how picky we have to be about those inductors.
If we're lucky, they can be most any small surface mount inductor.
Jerry, KE7ER
toggle quoted message
Show quoted text
On Fri, Nov 9, 2018 at 07:35 AM, Ashhar Farhan wrote:
so, there is one spur fix that is now consistently working for me.
among rhe solutions, i was looking for one that would be easy to apply.
first, the distortion in the 45 mhz amp is creating harmonic distortion. so a 0.3uh in series with a 10 pf is used across TP13 (output of the 45 MHz IF amp going to the front end mixer). 8 turns on T30-6 gives you 300nh.
second, there is a cross talk inside the Si5351 where the 12 mhz from the bfo leaks into the local oscillator. A 5uh in series with a 47 pf across C202 of the LPF will suppress it. 35 turns on T30-6 gives you 5uh.
- f
|
Im trying to upload new firmware to the bitx40 and the arduino isn't recognized by the comp the red light comes on but no where in the device manager.? I know it isn't a cable because it recognizes the uBitx and another nano just fine.? The bitx40 rx with no problem but i haven't tx yet.? So as i am a novice with the arduino my question is to the experts: before I begin to TRY and unsolder the existing arduino and solder in a new, is there something im missing that could be causing the comp to not recognize the Nano?
hope that isn't to confusing..
thanks
73 Tim
KF7VUT
|
Re: Need Source for Baofeng Mic Sockets
Scot, If you access this list from the website /g/BITX20/topics there is a search button toward the top.? Searching Baofeng Socket produces several hits including this gem /g/BITX20/message/46336--
|
David Posthuma
MadRadioModder