How to fix weak mic audio output?

?

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.

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.

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.

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.

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.

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.

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.

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.

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

<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=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.

--

Regards
Sarma
?

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.

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.

On Fri, 24 Feb, 2017 at 1:53 am, John Smith via Groups.Io

<johnlinux77@...> wrote:

One of the things I noticed about my first audio tests, was that I was off frequency. The Raduino needed to be calibrated to offset the zero beat so I wouldn't sound high pitched.?

You can easily test this by monitoring your signal with another receiver. Then tune your BITX up or down in frequency by one step at a time, and see how it sounds in the receiver.?

If they are not on the same frequency as you they only receive part of your signal. It can sound like Darth Vader one way, or Mickey Mouse the other way.