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Bitx 40 Problem

 

I decided that you guys are having so much fun that I took out #67 to give it a whirl.?


When powering up I get a very loud buzzing in the ear phones.? So, I power down, remove all external pigtails and then add them one at a time.? It seems to happened when adding the antenna to the circuit board.


Forgive me for asking here but I have little experience with the very small components.


Where to start looking??


Bill
 

Hi Bill

Start by checking that the toroid leads are not shorting together. You can use a toothpick to gentle spread them apart.

73

Ken VA3ABN

On Mon, Nov 28, 2016 at 4:25 PM, billrobbins946@... [BITX20] <BITX20@...> wrote:
?

I decided that you guys are having so much fun that I took out #67 to give it a whirl.?


When powering up I get a very loud buzzing in the ear phones.? So, I power down, remove all external pigtails and then add them one at a time.? It seems to happened when adding the antenna to the circuit board.


Forgive me for asking here but I have little experience with the very small components.


Where to start looking??


Bill
Bill Robbins
 

开云体育

Ken:

Thanks. That's the first thing I did having followed this group. I did spread a few out a little but no help.?

Bill?

Sent from my iPhone

On Nov 28, 2016, at 5:00 PM, Ken Chase chase8043@... [BITX20] <BITX20@...> wrote:

?

Hi Bill

Start by checking that the toroid leads are not shorting together. You can use a toothpick to gentle spread them apart.

73

Ken VA3ABN

On Mon, Nov 28, 2016 at 4:25 PM, billrobbins946@... [BITX20] <BITX20@...> wrote:
?

I decided that you guys are having so much fun that I took out #67 to give it a whirl.?


When powering up I get a very loud buzzing in the ear phones.? So, I power down, remove all external pigtails and then add them one at a time.? It seems to happened when adding the antenna to the circuit board.


Forgive me for asking here but I have little experience with the very small components.


Where to start looking??


Bill
 

Let's rule out the antenna. Do you have a signal source to fed to the antenna input? It has to be very low strenghth around 50 uvolts (S9). If you feed too strong a signal, you may overload the front end.

73 Ken

On Mon, Nov 28, 2016 at 5:02 PM, Bill Robbins wrobbins@... [BITX20] <BITX20@...> wrote:
?

Ken:

Thanks. That's the first thing I did having followed this group. I did spread a few out a little but no help.?

Bill?

Sent from my iPhone

On Nov 28, 2016, at 5:00 PM, Ken Chase chase8043@... [BITX20] <BITX20@...> wrote:

?

Hi Bill

Start by checking that the toroid leads are not shorting together. You can use a toothpick to gentle spread them apart.

73

Ken VA3ABN

On Mon, Nov 28, 2016 at 4:25 PM, billrobbins946@... [BITX20] <BITX20@...> wrote:
?

I decided that you guys are having so much fun that I took out #67 to give it a whirl.?


When powering up I get a very loud buzzing in the ear phones.? So, I power down, remove all external pigtails and then add them one at a time.? It seems to happened when adding the antenna to the circuit board.


Forgive me for asking here but I have little experience with the very small components.


Where to start looking??


Bill
Bill Robbins
 

开云体育

Yes I have one.?

Sent from my iPhone

On Nov 28, 2016, at 5:05 PM, Ken Chase chase8043@... [BITX20] <BITX20@...> wrote:

?

Let's rule out the antenna. Do you have a signal source to fed to the antenna input? It has to be very low strenghth around 50 uvolts (S9). If you feed too strong a signal, you may overload the front end.

73 Ken

On Mon, Nov 28, 2016 at 5:02 PM, Bill Robbins wrobbins@... [BITX20] <BITX20@...> wrote:
?

Ken:

Thanks. That's the first thing I did having followed this group. I did spread a few out a little but no help.?

Bill?

Sent from my iPhone

On Nov 28, 2016, at 5:00 PM, Ken Chase chase8043@... [BITX20] <BITX20@...> wrote:

?

Hi Bill

Start by checking that the toroid leads are not shorting together. You can use a toothpick to gentle spread them apart.

73

Ken VA3ABN

On Mon, Nov 28, 2016 at 4:25 PM, billrobbins946@... [BITX20] <BITX20@...> wrote:
?

I decided that you guys are having so much fun that I took out #67 to give it a whirl.?


When powering up I get a very loud buzzing in the ear phones.? So, I power down, remove all external pigtails and then add them one at a time.? It seems to happened when adding the antenna to the circuit board.


Forgive me for asking here but I have little experience with the very small components.


Where to start looking??


Bill
 

You may also be able to drape it over the antenna connector. Try that first without the antenna connected.

73 Ken

On Mon, Nov 28, 2016 at 5:19 PM, Bill Robbins wrobbins@... [BITX20] <BITX20@...> wrote:
?

Yes I have one.?

Sent from my iPhone

On Nov 28, 2016, at 5:05 PM, Ken Chase chase8043@... [BITX20] <BITX20@...> wrote:

?

Let's rule out the antenna. Do you have a signal source to fed to the antenna input? It has to be very low strenghth around 50 uvolts (S9). If you feed too strong a signal, you may overload the front end.

73 Ken

On Mon, Nov 28, 2016 at 5:02 PM, Bill Robbins wrobbins@... [BITX20] <BITX20@...> wrote:
?

Ken:

Thanks. That's the first thing I did having followed this group. I did spread a few out a little but no help.?

Bill?

Sent from my iPhone

On Nov 28, 2016, at 5:00 PM, Ken Chase chase8043@... [BITX20] <BITX20@...> wrote:

?

Hi Bill

Start by checking that the toroid leads are not shorting together. You can use a toothpick to gentle spread them apart.

73

Ken VA3ABN

On Mon, Nov 28, 2016 at 4:25 PM, billrobbins946@... [BITX20] <BITX20@...> wrote:
?

I decided that you guys are having so much fun that I took out #67 to give it a whirl.?


When powering up I get a very loud buzzing in the ear phones.? So, I power down, remove all external pigtails and then add them one at a time.? It seems to happened when adding the antenna to the circuit board.


Forgive me for asking here but I have little experience with the very small components.


Where to start looking??


Bill
Jeff Glass
 

开云体育

Do you have a nice strong power source? Like all high-gain LM386 circuits, the audio amp is prone to becoming an oscillator when starved of sufficient power.

Best,
Jeff
KK9JEF

Sent from my iPhone

On Nov 28, 2016, at 4:20 PM, Ken Chase chase8043@... [BITX20] <BITX20@...> wrote:

?

You may also be able to drape it over the antenna connector. Try that first without the antenna connected.

73 Ken

On Mon, Nov 28, 2016 at 5:19 PM, Bill Robbins wrobbins@... [BITX20] <BITX20@...> wrote:
?

Yes I have one.?

Sent from my iPhone

On Nov 28, 2016, at 5:05 PM, Ken Chase chase8043@... [BITX20] <BITX20@...> wrote:

?

Let's rule out the antenna. Do you have a signal source to fed to the antenna input? It has to be very low strenghth around 50 uvolts (S9). If you feed too strong a signal, you may overload the front end.

73 Ken

On Mon, Nov 28, 2016 at 5:02 PM, Bill Robbins wrobbins@... [BITX20] <BITX20@...> wrote:
?

Ken:

Thanks. That's the first thing I did having followed this group. I did spread a few out a little but no help.?

Bill?

Sent from my iPhone

On Nov 28, 2016, at 5:00 PM, Ken Chase chase8043@... [BITX20] <BITX20@...> wrote:

?

Hi Bill

Start by checking that the toroid leads are not shorting together. You can use a toothpick to gentle spread them apart.

73

Ken VA3ABN

On Mon, Nov 28, 2016 at 4:25 PM, billrobbins946@... [BITX20] <BITX20@...> wrote:
?

I decided that you guys are having so much fun that I took out #67 to give it a whirl.?


When powering up I get a very loud buzzing in the ear phones.? So, I power down, remove all external pigtails and then add them one at a time.? It seems to happened when adding the antenna to the circuit board.


Forgive me for asking here but I have little experience with the very small components.


Where to start looking??


Bill
Bill Robbins
 

开云体育

I have another, just arrived, Bitx 40.? Hooked it up and works as it should, at least for receive.?


#67, the first, cannot hear a signal generator putting out 0 dBm? signal.? Running it on a 12 volt battery eliminated a lot of hash.


So I at least know the signal is not making it very far.






From: BITX20@... on behalf of Jeff Glass kg6sgx@... [BITX20] Sent: Monday, November 28, 2016 5:51 PM
To: BITX20@...
Subject: Re: [BITX20] Bitx 40 Problem
?
?

Do you have a nice strong power source? Like all high-gain LM386 circuits, the audio amp is prone to becoming an oscillator when starved of sufficient power.

Best,
Jeff
KK9JEF

Sent from my iPhone

On Nov 28, 2016, at 4:20 PM, Ken Chase chase8043@... [BITX20] <BITX20@...> wrote:

?

You may also be able to drape it over the antenna connector. Try that first without the antenna connected.

73 Ken

On Mon, Nov 28, 2016 at 5:19 PM, Bill Robbins wrobbins@... [BITX20] <BITX20@...> wrote:
?

Yes I have one.?

Sent from my iPhone

On Nov 28, 2016, at 5:05 PM, Ken Chase chase8043@... [BITX20] <BITX20@...> wrote:

?

Let's rule out the antenna. Do you have a signal source to fed to the antenna input? It has to be very low strenghth around 50 uvolts (S9). If you feed too strong a signal, you may overload the front end.

73 Ken

On Mon, Nov 28, 2016 at 5:02 PM, Bill Robbins wrobbins@... [BITX20] <BITX20@...> wrote:
?

Ken:

Thanks. That's the first thing I did having followed this group. I did spread a few out a little but no help.?

Bill?

Sent from my iPhone

On Nov 28, 2016, at 5:00 PM, Ken Chase chase8043@... [BITX20] <BITX20@...> wrote:

?

Hi Bill

Start by checking that the toroid leads are not shorting together. You can use a toothpick to gentle spread them apart.

73

Ken VA3ABN

On Mon, Nov 28, 2016 at 4:25 PM, billrobbins946@... [BITX20] <BITX20@...> wrote:
?

I decided that you guys are having so much fun that I took out #67 to give it a whirl.?


When powering up I get a very loud buzzing in the ear phones.? So, I power down, remove all external pigtails and then add them one at a time.? It seems to happened when adding the antenna to the circuit board.


Forgive me for asking here but I have little experience with the very small components.


Where to start looking??


Bill

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