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Re: Bitx40 audio

 

I tried the 1nf cap and 10k resistor mod on pins 1/5 and no go. Has no affect on the audio. I'll give the 220 ufd change.

73 Ken

On Sun, Nov 27, 2016 at 12:22 PM, Rahul Srivastava vu3wjm@... [BITX20] <BITX20@...> wrote:
?

Hi!

While doing these mods try a 1nf cap in series with 10k resistor between pin 1 and 5 this also helps with the audio.

73's

Rahul VU3WJM


On Sunday, 27 November 2016 10:43 PM, "Ken Chase chase8043@... [BITX20]" <BITX20@...> wrote:


?
Thanks Joel.

I removed the cap at Pin1 & 8 long ago and that helped a lot. I'll try the 470 later today.

Hope you had a good Thanksgiving.

73 Ken

On Sun, Nov 27, 2016 at 11:50 AM, Joel Caulkins caulktel@... [BITX20] <BITX20@...> wrote:
?
Hi Ken,

No I haven't had much time over the holiday with my Family being around, however, the first thing I'm going to do is change that 450mfd snubber cap on the output of the LM386 to a 220. If you remove the cap between pins 1 and 8 of the 386 chip that will lower the gain and make it sound better already, (mine was distorting real bad), then change the 450 to a 220 for less bass. Hopefully it won't go into oscillation.

Joel Caulkins
KB6QVI

On Nov 27, 2016, at 8:15 AM, Ken Chase chase8043@... [BITX20] <BITX20@...> wrote:

?
Hi Joel

Did you ever check out the caps for the bassy audio?

73 Ken

On Wed, Nov 23, 2016 at 8:30 PM, Joel Caulkins caulktel@... [BITX20] <BITX20@...> wrote:
?
Ken,

Ive noticed the same thing about the bassy audio, i was going to change some cap values to see if i could improve it. Ill let you know how it comes out.

Joel KB6QVI

On Nov 23, 2016, at 4:55 PM, Ken Chase chase8043@... [BITX20] <BITX20@...> wrote:

?
I've finally hooked up a 5351 to the Bitx40. In testing I noticed two things(not related to the 5351)

The audio is very 'bassy' sounding. Is there some way to improve the quality or does the BFO have to be moved slightly?

As I tune the vfo from the lower end of the band and up, the closer I get to the end of the band, signal ?strength drops. Is this due to the BPF?

73

Ken VA3ABN.
Re: Bitx40 #861 arrived

 

Dear Farhan and all the Bitx40 team,

Bitx40 #861 arrived this morning, hand delivered to my front door.

The Bitx40 is beautifully packed.

I will let you know how the testing and integration goes.

Thank you and best regards from,

Peter VK1XP

Canberra

Australia
Re: Bitx 40 Problem

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
PA Transformers for Bitx40

 

The photo on 'hfsigs' shows PA Transformers for Bitx40 made from toroid cores, but the schematics shows some 6 terminal TV balun binocular or something else - I do not know.

Could Farhan or someone else please give inductance values and bifilar turns for FT37-43 for the 3 stage transmission line transformers for BITX40 PA.

Thank you
Roy
Re: Ebay Store Kits Out Of Stock?

 

I have a BITX 20m v.3 PA PCB from the ebay shop of Sunil VU3SUA. It has two amplifier stages and two transformers. The description says it can be modified for 40m. But it does not say how.

How many bifilar turns on FT37-43 should I use for the driver and final transformers when I build for 40 meter / 7mHz?

Thank you.
Roy
Re: Bitx 40 Problem

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
Re: Bitx 40 Problem

 

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
Re: Bitx 40 Problem

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
Re: MY BITX40 arrived - thanks!

 

try



73 Ken

On Mon, Nov 14, 2016 at 4:18 PM, Jerry Barr kj6ntl@... [BITX20] <BITX20@...> wrote:
?

ok ,iam seeing so much chatter on the new bit-x 40, how much is it and so forth

Jerry
K7ANQ
Skcc# 10843
10-10 # 76401

--------------------------------------------
On Mon, 11/14/16, Ian Gerard iank3hql@... [BITX20] <BITX20@...> wrote:

Subject: Re: [BITX20] MY BITX40 arrived - thanks!
To: "BITX20@..." <BITX20@...>
Date: Monday, November 14, 2016, 6:25 AM


?









I
just ordered my BitX 40. I was wondering if there was a
ready made enclosure kit for it? I plan on using a DDS with
it and was wondering were any mod details available yet on
that subject?
Thanks
all ?Ian K3HQL

On Monday, November
14, 2016 7:10 AM, "Baruch Atta baruchatta@...
[BITX20]" <BITX20@...> wrote:



?









My ordered
Bitx40 arrived without any damage to the box or contents.
The VFO toroid was bent over but probably due to shaking of
the box. Thanks Farhan.

Now waiting for
the enclosure.? I plan to hook it up on the bench tonight.
?
thanksJoe
W3TTT






















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Re: Bitx 40 Problem

 

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
Re: Bitx 40 Problem

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
#952 has arrived

 

Hi #952 has arrived safe and sound to the UK in 6 days, very speedy and well packaged.
I have nearly finished the home brew Si5351 VFO / BFO so I will be able to power it up soon.
73 Karl
G7AFT
Re: Bitx 40 Problem

 

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
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
Re: Bitx 40 board.

Baruch Atta
 

I used the RED wire.? I think. . . .?

On Mon, Nov 28, 2016 at 10:04 AM, cruisenewsnet@... [BITX20] <BITX20@...> wrote:
?

Did you add it to the red wire or black wire?
Re: Ebay Store Kits Out Of Stock?

 

Our new batch of Bitx version 3B 3C kits,shall be available by the end of this week on our Ebay Store. We start with 20mt kits followed by the Bitx Version 3B 3C 40mt kits too.?

Thanks for your patience and great support.?

best of 73s
Sunil VU3SUA
Re: BITX 40 - DDS right connection

 

Thanks, It is a good solution.
73.
BitX40 #646 Has Arrived!

BLPisani@gmail.com
 

Well, technically it arrived Friday, but I wasn't able to go to the post office to pick it up until this morning. That is going to be so much fun when I get time to put it together, get an antenna built, and so on...

I am thinking of making one mod almost right away, though. I want to replace the microphone and earphone connectors with a TRRS jack ( - Goes to Mouser) so I can use my cellphone headset with it. It's a 3.5mm TRRS plug, works with my laptop, cell phone, and with an adapter my desktop PC. (I'm guessing to split the + line on SPK1 for T and R1, + line for MIC (not labeled, but I assume is the 2-pin to the right of SPK1) to R2, and combine - on both SPK1 and MIC to S.) I'll probably also get a 10-turn pot and some nice knobs from Adafruit.

My only concerns so far are that C103 appears unpopulated, and L5 next to it is a piece of wire rather than an inductor.

Everything looks good, though, and I can't wait to dig in.
Re: Bitx 40 board.

 

Did you add it to the red wire or black wire?
Re: BITX 40 - DDS right connection

Jack Purdum
 

The VFO we built for the Forty-9er (March, 2016, QST or see:?)?has buffered output if needed. Two sets of header pins?


allow the user to pick off the drive they need. Farrukh charges $7 for a good quality PCB and he also has a kit with some of the parts for $15 (not including the AD9850 or the Nano). The software to drive the Nano is a free download. You can download the assembly manual I wrote for the article, which should give you a good feel for what's involved.

73,
Jack, W8TEE


From: "ik8yfw@... [BITX20]"
To: BITX20@...
Sent: Monday, November 28, 2016 1:27 AM
Subject: [BITX20] Re: BITX 40 - DDS right connection

?
Thanks Mike, this is a good news. I will try to use a small amplifier to output the 9850, mybe it will help a lot. I've used the 9850 with a ne602 based receiver with success. I think that a couple of 2n2222 will solve the problem.I Hope to test it in the next days or in the weekend.?
73 ik8yfw
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