Re: Handheld Mic w/ PTT for BITX40
My mic cost me $0.87 to build from the parts that came with the B40. (See pix.) The mic cord is an old telephone cable from the house phone line that was lying around. While its construction is pretty obvious, details will be in the April, QRP Quarterly. The green stuff is large diameter shrink tubing that I got in a Dayton grab bag...it's so big I never thought I'd find a use for it. You never know...
Jack, W8TEE
From: Richard Andrew Knack via Groups.Io <ihc73scout2@...>
To: [email protected]
Sent: Thursday, February 23, 2017 4:45 AM
Subject: Re: [BITX20] Handheld Mic w/ PTT for BITX40
Why not this one:
Rich KC8MWG
On Thursday, February 23, 2017 1:58 AM, Ryan Flowers <geocrasher@...> wrote:
On Wed, Feb 22, 2017 at 10:46 pm, John Smith wrote: Use a small plastic box that feels like a comfortable mic, and put the mic poking out of the face of it, and the button on the side. That one from Banggood has 8 pins. You would only need 4, two for the mic wires, and two for the button wires. And it's just wasteful to buy a mic only to rip it's guts out for a downgrade. ?Look for a small picture hanging parts box in a gift type tool box. Or ask a woman you know for something like that used for cosmetics. Or look for a small project enclosure box that looks like a small radio microphone. Here is an example of someone's photo in the emailed photos folder on this site. Otherwise get the cheapest Baofeng hand mic and hack it. It also has a speaker in it.
?I considered doing that. The biggest thing is that I want one of those mic cables because they coil up, and currently mine does not. Perhaps I just need to find a better cable for the one I have. The coiled cords are $10 everywhere I've looked, and this whole mic is $10. And it's not wasteful if it serves my purpose. I know I'll have to source an 8 pin connector for it- ?else buy a mating 4 pin connector set and replace them, which I could easily do. My concern isn't whether this is a good idea. My concern is- is there any reason it won't work?
--
Ryan Flowers KC7RYS?
|
Re: weak mic audio output,
Dwine,
A quick fix? would be a speech processor. Or you could add a bigger
heat sink and change the final voltage to 24V and get a
bigger signal!
Raj
At 23/02/2017, you wrote:
toggle quoted message
Show quoted text
Is the grounding of the red
wire(calibration)is no help in this situation?
- On Thu, 23 Feb, 2017 at 7:49 pm, Raj vu2zap
- <vu2zap@...> wrote:
- Correction not CW but USB/LSB. Just woke up from a nap!
- Yes, you will either need a frequency counter or a commercial Rx or
Tcvr.
- You can put a short wire from commercial Rx/Tcvr as a pickup near the
BITX and tune around 12Mhz to get the BFO carrier beat note in
CW.
- Tune for ZERO beat and see what you get!
- Raj
- At 23/02/2017, you wrote:
- Hello raj,
- How to check bfo frequency?is there a need special
instruments?
- On Thu, 23 Feb, 2017 at 4:51 pm, Raj vu2zap
- <vu2zap@...> wrote:
- Check the BFO frequency. 11.9985 MHz.
- If you have full power then your signal is fine but if the BFO is off
then the voice can sound bassy or tinny.
- Maybe thats what was meant by weak audio or simply a weak signal -
you are QRP after all!
- Raj
- At 23/02/2017, you wrote:
- i will trace it again john,,that`s what make me wonder during
QSO.,they told me i have very weak audio.,
- 73`
- On Thu, 23 Feb, 2017 at 4:21 pm, John Smith via Groups.Io
- <johnlinux77@...> wrote:
- Ya got me licked. Do you feel like there is not enough audio signal
being produced before it goes out to the antenna? If yes, then that's
what I would have told you and everyone else. Did you say you changed out
the mic? If it's not the drive or or the mic, then it must be a short
including a loose connection. Check your different soldered wire
connections and trace the connections on the board for those solder
joints. Just look at it for anything wrong or smells funny or is missing.
When you find it bring it back here.
|
Re: weak mic audio output,
Is the grounding of the red wire(calibration)is no help in this situation?
On Thu, 23 Feb, 2017 at 7:49 pm, Raj vu2zap <vu2zap@...> wrote:
Correction not CW but USB/LSB. Just woke up from a nap!
Yes, you will either need a frequency counter or a commercial Rx or
Tcvr.
You can put a short wire from commercial Rx/Tcvr as a pickup near the
BITX and tune around 12Mhz to get the BFO carrier beat note in
CW.
Tune for ZERO beat and see what you get!
Raj
At 23/02/2017, you wrote:
Hello raj,
How to check bfo frequency?is there a need special instruments?
- On Thu, 23 Feb, 2017 at 4:51 pm, Raj vu2zap
- <vu2zap@...> wrote:
- Check the BFO frequency. 11.9985 MHz.
- If you have full power then your signal is fine but if the BFO is off
then the voice can sound bassy or tinny.
- Maybe thats what was meant by weak audio or simply a weak signal -
you are QRP after all!
- Raj
- At 23/02/2017, you wrote:
- i will trace it again john,,that`s what make me wonder during
QSO.,they told me i have very weak audio.,
- 73`
- On Thu, 23 Feb, 2017 at 4:21 pm, John Smith via Groups.Io
- <johnlinux77@...> wrote:
- Ya got me licked. Do you feel like there is not enough audio signal
being produced before it goes out to the antenna? If yes, then that's
what I would have told you and everyone else. Did you say you changed out
the mic? If it's not the drive or or the mic, then it must be a short
including a loose connection. Check your different soldered wire
connections and trace the connections on the board for those solder
joints. Just look at it for anything wrong or smells funny or is missing.
When you find it bring it back here.
|
Re: weak mic audio output,
Hello OM Sarma,i already did that,but still the mic audio output is tiny accordingly,
On Thu, 23 Feb, 2017 at 7:45 pm, Mvs Sarma <mvssarma@...> wrote: try replacing the mic element . Perhaps you might get one at home from PC headset or any such utility.
ensure that the mic is connected in right direction.
|
Re: weak mic audio output,
I have no freq.counter and spare rx rig,,but anyway thank you OM raj for the info.
On Thu, 23 Feb, 2017 at 7:34 pm, Raj vu2zap <vu2zap@...> wrote:
Yes, you will either need a frequency counter or a commercial Rx or
Tcvr.
You can put a short wire from commercial Rx/Tcvr as a pickup near the
BITX and tune around 12Mhz to get the BFO carrier beat note in CW.
Tune for ZERO beat and see what you get!
Raj
At 23/02/2017, you wrote:
Hello raj,
How to check bfo frequency?is there a need special instruments?
- On Thu, 23 Feb, 2017 at 4:51 pm, Raj vu2zap
- <vu2zap@...> wrote:
- Check the BFO frequency. 11.9985 MHz.
- If you have full power then your signal is fine but if the BFO is off
then the voice can sound bassy or tinny.
- Maybe thats what was meant by weak audio or simply a weak signal -
you are QRP after all!
- Raj
- At 23/02/2017, you wrote:
- i will trace it again john,,that`s what make me wonder during
QSO.,they told me i have very weak audio.,
- 73`
- On Thu, 23 Feb, 2017 at 4:21 pm, John Smith via Groups.Io
- <johnlinux77@...> wrote:
- Ya got me licked. Do you feel like there is not enough audio signal
being produced before it goes out to the antenna? If yes, then that's
what I would have told you and everyone else. Did you say you changed out
the mic? If it's not the drive or or the mic, then it must be a short
including a loose connection. Check your different soldered wire
connections and trace the connections on the board for those solder
joints. Just look at it for anything wrong or smells funny or is missing.
When you find it bring it back here.
|
Re: weak mic audio output,
Correction not CW but USB/LSB. Just woke up from a nap!
Yes, you will either need a frequency counter or a commercial Rx or
Tcvr.
You can put a short wire from commercial Rx/Tcvr as a pickup near the
BITX and tune around 12Mhz to get the BFO carrier beat note in
CW.
Tune for ZERO beat and see what you get!
Raj
At 23/02/2017, you wrote:
toggle quoted message
Show quoted text
Hello raj,
How to check bfo frequency?is there a need special instruments?
- On Thu, 23 Feb, 2017 at 4:51 pm, Raj vu2zap
- <vu2zap@...> wrote:
- Check the BFO frequency. 11.9985 MHz.
- If you have full power then your signal is fine but if the BFO is off
then the voice can sound bassy or tinny.
- Maybe thats what was meant by weak audio or simply a weak signal -
you are QRP after all!
- Raj
- At 23/02/2017, you wrote:
- i will trace it again john,,that`s what make me wonder during
QSO.,they told me i have very weak audio.,
- 73`
- On Thu, 23 Feb, 2017 at 4:21 pm, John Smith via Groups.Io
- <johnlinux77@...> wrote:
- Ya got me licked. Do you feel like there is not enough audio signal
being produced before it goes out to the antenna? If yes, then that's
what I would have told you and everyone else. Did you say you changed out
the mic? If it's not the drive or or the mic, then it must be a short
including a loose connection. Check your different soldered wire
connections and trace the connections on the board for those solder
joints. Just look at it for anything wrong or smells funny or is missing.
When you find it bring it back here.
|
Re: weak mic audio output,
try replacing the mic element . Perhaps you might get one at home from PC headset or any such utility.
ensure that the mic is connected in right direction.
On Thu, Feb 23, 2017 at 4:18 PM, dwinesumalpongjr@... via Groups.Io <dwinesumalpongjr@...> wrote: Hello raj,How to check bfo frequency?is there a need special instruments? On Thu, 23 Feb, 2017 at 4:51 pm, Raj vu2zap
Check the BFO frequency. 11.9985 MHz.
If you have full power then your signal is fine but if the BFO is off
then the voice can sound bassy or tinny.
Maybe thats what was meant by weak audio or simply a weak signal - you
are QRP after all!
Raj
At 23/02/2017, you wrote:
i will trace it again
john,,that`s what make me wonder during QSO.,they told me i have very
weak audio.,
73`
- On Thu, 23 Feb, 2017 at 4:21 pm, John Smith via Groups.Io
- <johnlinux77=yahoo.com@groups.io> wrote:
- Ya got me licked. Do you feel like there is not enough audio signal
being produced before it goes out to the antenna? If yes, then that's
what I would have told you and everyone else. Did you say you changed out
the mic? If it's not the drive or or the mic, then it must be a short
including a loose connection. Check your different soldered wire
connections and trace the connections on the board for those solder
joints. Just look at it for anything wrong or smells funny or is missing.
When you find it bring it back here.
|
Re: weak mic audio output,
Yes, you will either need a frequency counter or a commercial Rx or
Tcvr.
You can put a short wire from commercial Rx/Tcvr as a pickup near the
BITX and tune around 12Mhz to get the BFO carrier beat note in CW.
Tune for ZERO beat and see what you get!
Raj
At 23/02/2017, you wrote:
toggle quoted message
Show quoted text
Hello raj,
How to check bfo frequency?is there a need special instruments?
- On Thu, 23 Feb, 2017 at 4:51 pm, Raj vu2zap
- <vu2zap@...> wrote:
- Check the BFO frequency. 11.9985 MHz.
- If you have full power then your signal is fine but if the BFO is off
then the voice can sound bassy or tinny.
- Maybe thats what was meant by weak audio or simply a weak signal -
you are QRP after all!
- Raj
- At 23/02/2017, you wrote:
- i will trace it again john,,that`s what make me wonder during
QSO.,they told me i have very weak audio.,
- 73`
- On Thu, 23 Feb, 2017 at 4:21 pm, John Smith via Groups.Io
- <johnlinux77@...> wrote:
- Ya got me licked. Do you feel like there is not enough audio signal
being produced before it goes out to the antenna? If yes, then that's
what I would have told you and everyone else. Did you say you changed out
the mic? If it's not the drive or or the mic, then it must be a short
including a loose connection. Check your different soldered wire
connections and trace the connections on the board for those solder
joints. Just look at it for anything wrong or smells funny or is missing.
When you find it bring it back here.
|
Re: weak mic audio output,
Hello raj, How to check bfo frequency?is there a need special instruments?
On Thu, 23 Feb, 2017 at 4:51 pm, Raj vu2zap <vu2zap@...> wrote:
Check the BFO frequency. 11.9985 MHz.
If you have full power then your signal is fine but if the BFO is off
then the voice can sound bassy or tinny.
Maybe thats what was meant by weak audio or simply a weak signal - you
are QRP after all!
Raj
At 23/02/2017, you wrote:
i will trace it again
john,,that`s what make me wonder during QSO.,they told me i have very
weak audio.,
73`
- On Thu, 23 Feb, 2017 at 4:21 pm, John Smith via Groups.Io
- <johnlinux77@...> wrote:
- Ya got me licked. Do you feel like there is not enough audio signal
being produced before it goes out to the antenna? If yes, then that's
what I would have told you and everyone else. Did you say you changed out
the mic? If it's not the drive or or the mic, then it must be a short
including a loose connection. Check your different soldered wire
connections and trace the connections on the board for those solder
joints. Just look at it for anything wrong or smells funny or is missing.
When you find it bring it back here.
|
Re: Finished and calibrated, thanks to everyone the BITX20 group. I only wish I could build the nice displays many of you did.
I'm going to try this?? from QRP kits to see if that eliminates the noise.
|
Re: Handheld Mic w/ PTT for BITX40
Why not this one:
Rich KC8MWG
On Thursday, February 23, 2017 1:58 AM, Ryan Flowers <geocrasher@...> wrote:
On Wed, Feb 22, 2017 at 10:46 pm, John Smith wrote: Use a small plastic box that feels like a comfortable mic, and put the mic poking out of the face of it, and the button on the side. That one from Banggood has 8 pins. You would only need 4, two for the mic wires, and two for the button wires. And it's just wasteful to buy a mic only to rip it's guts out for a downgrade. ?Look for a small picture hanging parts box in a gift type tool box. Or ask a woman you know for something like that used for cosmetics. Or look for a small project enclosure box that looks like a small radio microphone. Here is an example of someone's photo in the emailed photos folder on this site. Otherwise get the cheapest Baofeng hand mic and hack it. It also has a speaker in it.
?I considered doing that. The biggest thing is that I want one of those mic cables because they coil up, and currently mine does not. Perhaps I just need to find a better cable for the one I have. The coiled cords are $10 everywhere I've looked, and this whole mic is $10. And it's not wasteful if it serves my purpose. I know I'll have to source an 8 pin connector for it- ?else buy a mating 4 pin connector set and replace them, which I could easily do. My concern isn't whether this is a good idea. My concern is- is there any reason it won't work?
--
Ryan Flowers KC7RYS?
|
Re: weak mic audio output,
Check the BFO frequency. 11.9985 MHz.
If you have full power then your signal is fine but if the BFO is off
then the voice can sound bassy or tinny.
Maybe thats what was meant by weak audio or simply a weak signal - you
are QRP after all!
Raj
At 23/02/2017, you wrote:
toggle quoted message
Show quoted text
i will trace it again
john,,that`s what make me wonder during QSO.,they told me i have very
weak audio.,
73`
- On Thu, 23 Feb, 2017 at 4:21 pm, John Smith via Groups.Io
- <johnlinux77@...> wrote:
- Ya got me licked. Do you feel like there is not enough audio signal
being produced before it goes out to the antenna? If yes, then that's
what I would have told you and everyone else. Did you say you changed out
the mic? If it's not the drive or or the mic, then it must be a short
including a loose connection. Check your different soldered wire
connections and trace the connections on the board for those solder
joints. Just look at it for anything wrong or smells funny or is missing.
When you find it bring it back here.
|
Re: weak mic audio output,
i will trace it again john,,that`s what make me wonder during QSO.,they told me i have very weak audio.,
On Thu, 23 Feb, 2017 at 4:21 pm, John Smith via Groups.Io <johnlinux77@...> wrote: Ya got me licked. Do you feel like there is not enough audio signal being produced before it goes out to the antenna? If yes, then that's what I would have told you and everyone else. Did you say you changed out the mic? If it's not the drive or or the mic, then it must be a short including a loose connection. Check your different soldered wire connections and trace the connections on the board for those solder joints. Just look at it for anything wrong or smells funny or is missing. When you find it bring it back here.
|
Re: weak mic audio output,
Ya got me licked. Do you feel like there is not enough audio signal being produced before it goes out to the antenna? If yes, then that's what I would have told you and everyone else. Did you say you changed out the mic? If it's not the drive or or the mic, then it must be a short including a loose connection. Check your different soldered wire connections and trace the connections on the board for those solder joints. Just look at it for anything wrong or smells funny or is missing. When you find it bring it back here.
|
Re: weak mic audio output,
Hello john,
I already did that,adjusting R136 and RV1 and it gives 5-6Watts output but the problem is that my audio is weak.replacing new emc make no changes,,
On Thu, 23 Feb, 2017 at 3:10 pm, John Smith via Groups.Io <johnlinux77@...> wrote: Try adjusting R136 a silver trimmer on the same side of the board as the PA near the corner. If you rotate it counter clockwise it will increase watts output. It's best to adjust it up to the point your multimeter shows your PA current draw is about 1 Amp when saying a long aahhh like the Doctor tells ya to say. And don't yell loud. Yelling and over driving the PA causes overmodulation distortion that can't be understood. This usually fixes low audio and low TX power. I have never seen anyone come back and say "Nope that wasn't it". Replacing the mic gave be better audio quality too.
|
Re: weak mic audio output,
Try adjusting R136 a silver trimmer on the same side of the board as the PA near the corner. If you rotate it counter clockwise it will increase watts output. It's best to adjust it up to the point your multimeter shows your PA current draw is about 1 Amp when saying a long aahhh like the Doctor tells ya to say. And don't yell loud. Yelling and over driving the PA causes overmodulation distortion that can't be understood. This usually fixes low audio and low TX power. I have never seen anyone come back and say "Nope that wasn't it". Replacing the mic gave be better audio quality too.
|
Re: weak mic audio output,
Do you mean that you have low transmitter output? ?If so, could be that you need to bump up the gain at R136. ?See post?/g/BITX20/message/22112? But do not turn R136 up so high that you get distortion. ? ?Also maybe check out this post ?/g/BITX20/message/22252? Then ask John Smith if you have any questions. ? Of course, there are many potential faults in the Bitx40 that could reduce transmitter output.? Jerry, KE7ER
On Wed, Feb 22, 2017 at 09:55 pm, dwinesumalpongjr@... wrote: How to fix weak mic audio output?
?
|
Re: Handheld Mic w/ PTT for BITX40
On Wed, Feb 22, 2017 at 10:46 pm, John Smith wrote: Use a small plastic box that feels like a comfortable mic, and put the mic poking out of the face of it, and the button on the side. That one from Banggood has 8 pins. You would only need 4, two for the mic wires, and two for the button wires. And it's just wasteful to buy a mic only to rip it's guts out for a downgrade. ?Look for a small picture hanging parts box in a gift type tool box. Or ask a woman you know for something like that used for cosmetics. Or look for a small project enclosure box that looks like a small radio microphone. Here is an example of someone's photo in the emailed photos folder on this site. Otherwise get the cheapest Baofeng hand mic and hack it. It also has a speaker in it.
?I considered doing that. The biggest thing is that I want one of those mic cables because they coil up, and currently mine does not. Perhaps I just need to find a better cable for the one I have. The coiled cords are $10 everywhere I've looked, and this whole mic is $10. And it's not wasteful if it serves my purpose. I know I'll have to source an 8 pin connector for it- ?else buy a mating 4 pin connector set and replace them, which I could easily do. My concern isn't whether this is a good idea. My concern is- is there any reason it won't work?
--
Ryan Flowers KC7RYS?
|
Re: Handheld Mic w/ PTT for BITX40
Use a small plastic box that feels like a comfortable mic, and put the mic poking out of the face of it, and the button on the side. That one from Banggood has 8 pins. You would only need 4, two for the mic wires, and two for the button wires. And it's just wasteful to buy a mic only to rip it's guts out for a downgrade. ?Look for a small picture hanging parts box in a gift type tool box. Or ask a woman you know for something like that used for cosmetics. Or look for a small project enclosure box that looks like a small radio microphone. Here is an example of someone's photo in the emailed photos folder on this site. Otherwise get the cheapest Baofeng hand mic and hack it. It also has a speaker in it. https://s3-us-west-1.amazonaws.com/groupsioattachments/5062/4403366/22283/0?AWSAccessKeyId=AKIAJECNKOVMCCU3ATNQ&Expires=1487832161&Signature=YcUJN8%2B0k4Z2LWBO6SO35s9qEkE%3D
|
Once again Jerry, that was exactly it. I replaced all but the last "}" and it compiled. When I tried to highlight "{" on #617 it wouldn't let me. It would go to ")" instead. Does that mean there wasn't a pair? It was much lower in the sketch than the replaced section at #541. When I dropped the cursor on other "{" markings it put a small box around it's mate. I'll check it out tomorrow afternoon.?
|
Raj vu2zap