Date   
Re: Toroids Loose on Arrival

 

As long as none of the wires are broken on the toroids, all you need to do is straighten them. They pretty much all came with toroids crunched, mine did. For glue, I use hot glue, but you can use silicon or contact cement or anything really. I used to use clear finger nail polish. Don't glue L4 down until you get it on frequency by compressing the turns or loosening them until you get the band coverage you want. You should be on the air soon.

Joel Caulkins
KB6QVI

On Nov 29, 2016, at 4:18 PM, geocrasher@... [BITX20] <BITX20@...> wrote:

 

Howdy all,


I've just received #697 in the mail today, and I sure am excited to get on the air! I did notice a couple of toroids were loose on it, and before I power it up and start playing with it, I want to be sure that they just came unglued and need to be glued back down. Here are pictures of what I see:


L2: http://puu.sh/syTg7/309a86ba3e.jpg


L4:  http://puu.sh/syTiP/c184375c22.jpg (at least, I think this is L4 according to the schematic- it's not visible on the board)


Both of these were oriented incorrectly as seen here:


http://puu.sh/syRFW/b9c675e674.jpg


I straightened them out, but am not sure what to glue them down with. Any assistance would be most appreciated. Thanks!


Toroids Loose on Arrival

Ryan Flowers
 

Howdy all,


I've just received #697 in the mail today, and I sure am excited to get on the air! I did notice a couple of toroids were loose on it, and before I power it up and start playing with it, I want to be sure that they just came unglued and need to be glued back down. Here are pictures of what I see:


L2: http://puu.sh/syTg7/309a86ba3e.jpg


L4:  http://puu.sh/syTiP/c184375c22.jpg (at least, I think this is L4 according to the schematic- it's not visible on the board)


Both of these were oriented incorrectly as seen here:


http://puu.sh/syRFW/b9c675e674.jpg


I straightened them out, but am not sure what to glue them down with. Any assistance would be most appreciated. Thanks!


Re: BITX40 Arrived!

Ryan Flowers
 

BITX40 v3 #697  arrived in Washington State today. Very excited to get on the air with this radio! A couple of toroids are loose however so I'll be posting about that separately. 

Re: Bitx40 audio

Ken
 

I hooked up the speaker and it sounds a million times better with the new cap. Thanks Joel.

73 Ken

On Tue, Nov 29, 2016 at 1:48 PM, caulktel@... [BITX20] <BITX20@...> wrote:
 

Ken,

I changed mine this morning and the receive audio is just about perfect now on a mobile speaker mounted up on my shelve.

Joel
KB6QVI


Re: Ebay Store Kits Out Of Stock?

Mark Baldridge
 

I just want to say thanks guys for the clarifications. I think for the fun of it I'll be building mine with a through-hole kit. I just feel like I'll have more fun modding it, and it'll look older and cooler. :)

Also planning to add a CW tone generator to it.

THX, KC9DZT Mark

On Mon, Nov 28, 2016 at 5:03 PM, r j rjinspace@... [BITX20] <BITX20@...> wrote:
 

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




--
Mark Baldridge
608.561.3853

Re: BITX40 Arrived!

Ken
 

Nice job John, looks great!

I also plan on a PCB case.

73

Ken VA3ABN

On Tue, Nov 29, 2016 at 3:39 PM, johnbaggott@... [BITX20] <BITX20@...> wrote:
 

I have mine built now photos in the link below, next job is DDS and hook up the audio through my mixer, this has and is so much fun. 


K2BAG BITX40 build



Re: BITX40 Arrived!

John Baggott
 

I have mine built now photos in the link below, next job is DDS and hook up the audio through my mixer, this has and is so much fun. 

K2BAG BITX40 build


Re: Bitx40 audio

Ken
 

In the case of the 470 ufd, it is rated 25 volts. If replacing with a 220 ufd use 25 volts as well.

73 Ken

On Tue, Nov 29, 2016 at 3:05 PM, ohwenzelph@... [BITX20] <BITX20@...> wrote:
 

what voltage are the electrolytic and smd caps rated at?

jerry aa1of/6


Re: Bitx40 audio

ohwenzelph
 

what voltage are the electrolytic and smd caps rated at?
jerry aa1of/6

Re: Bitx40 audio

Ken
 

Excellent. I'll find out about my mod tonight.

73 Ken

On Tue, Nov 29, 2016 at 1:48 PM, caulktel@... [BITX20] <BITX20@...> wrote:
 

Ken,

I changed mine this morning and the receive audio is just about perfect now on a mobile speaker mounted up on my shelve.

Joel
KB6QVI


Re: Bitx40 audio

 

Ken,

I changed mine this morning and the receive audio is just about perfect now on a mobile speaker mounted up on my shelve.

Joel
KB6QVI

Re: Bitx40 #861 arrived

Arv Evans
 

Jac, W8TEE


Number that most are referring to is the black marker pen hand written number 
along one edge, usually near the "BITX40v3, (C) HFSIGS.COM" label.  It is not
so much a Serial Number as it is the number of boards shipped (mine is number
124).

Someone asked earlier about the HF mixer transformers T1 and T2.....they
appear to be  10-turns trifilar twisted conductors on an FT37-43 core.  Same
for T-4, T-5, T-6, and T-7.   These would be typical broadband transmission-line
style transformers with turns ratio of 10:10:10. 

Arv  K7HKL
_._


On Mon, Nov 28, 2016 at 7:37 PM, Jack Purdum econjack@... [BITX20] <BITX20@...> wrote:
 

Okay...at the risk of sounding stupid...again...where is everyone getting the serial number from? There's a small white square on the board with "38 16" on it, but there is a space between the two numbers. I just got my BITX40 a little over a week ago and the holiday has prevented me from hooking things up, so I can't comment on that. Those numbers don't seem right, so what am I missing?

Jac, W8TEE



From: "pierre@... [BITX20]" <BITX20@...>
To: BITX20@...
Sent: Monday, November 28, 2016 6:38 PM
Subject: Re: [BITX20] 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: Bitx40 audio

 

Great Ken, I will try it today myself. I never use more than 220.

Joel Caulkins
KB6QVI

On Nov 29, 2016, at 5:38 AM, Ken Chase chase8043@... [BITX20] <BITX20@...> wrote:

 

I changed the 470 uf cap to 220 uf. In the headphones it does sound better. The real test is with a speaker later tonight.

Looking at the LM386 app motes, the 1 nf and 10K is to increase bass response, which would explain why it didn't have any affect.

73 Ken

On Mon, Nov 28, 2016 at 9:43 PM, Joel Caulkins caulktel@... [BITX20] <BITX20@...> wrote:
 

Well, I had to finally ask after many QSOs because nobody ever made a comment on my audio. As it turns out everybody thinks I'm on a "big rig", the audio reports are excellent using my homemade electret mic, built in a ink pen housing. I'm even growing accustom to the receive audio even though a little bassy. All in all, I'm pretty pleased with the BitX40.

Joel Caulkins
KB6QVI

On Nov 28, 2016, at 6:04 PM, Ken Chase chase8043@... [BITX20] <BITX20@...> wrote:

 

Hi Joel

How's the audio report back to you?

73 Ken

On Mon, Nov 28, 2016 at 9:03 PM, Joel Caulkins caulktel@... [BITX20] <BITX20@...> wrote:
 

Ken,

I did that also today and noticed no affect at all. I think the changes need to be made further up the audio chain before it gets to the amp. I just have too many irons in the fire to try anything, except I do check into a Net everyday with it.

Joel Caulkins
KB6QVI

On Nov 28, 2016, at 5:18 PM, Ken Chase chase8043@... [BITX20] <BITX20@...> wrote:

 

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 audio

Ken
 

I changed the 470 uf cap to 220 uf. In the headphones it does sound better. The real test is with a speaker later tonight.

Looking at the LM386 app motes, the 1 nf and 10K is to increase bass response, which would explain why it didn't have any affect.

73 Ken

On Mon, Nov 28, 2016 at 9:43 PM, Joel Caulkins caulktel@... [BITX20] <BITX20@...> wrote:
 

Well, I had to finally ask after many QSOs because nobody ever made a comment on my audio. As it turns out everybody thinks I'm on a "big rig", the audio reports are excellent using my homemade electret mic, built in a ink pen housing. I'm even growing accustom to the receive audio even though a little bassy. All in all, I'm pretty pleased with the BitX40.

Joel Caulkins
KB6QVI

On Nov 28, 2016, at 6:04 PM, Ken Chase chase8043@... [BITX20] <BITX20@...> wrote:

 

Hi Joel

How's the audio report back to you?

73 Ken

On Mon, Nov 28, 2016 at 9:03 PM, Joel Caulkins caulktel@... [BITX20] <BITX20@...> wrote:
 

Ken,

I did that also today and noticed no affect at all. I think the changes need to be made further up the audio chain before it gets to the amp. I just have too many irons in the fire to try anything, except I do check into a Net everyday with it.

Joel Caulkins
KB6QVI

On Nov 28, 2016, at 5:18 PM, Ken Chase chase8043@... [BITX20] <BITX20@...> wrote:

 

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.







My BITX arrive too

Miguel Angelo Bartie
 

Hello Guys

My BITX arrive in 12 days .... a record for my country...
It looks great !
I will post ...more infos...
THANKS a lot

73 from py2ohh miguel


Re: Bitx 40 board.

Giuseppe Callipo
 

Mark, This is the official bitx40 hack blog:

http://bitxhacks.blogspot.it

73 Giuseppe, ik8yfw

Re: BITX 40 - DDS right connection

Giuseppe Callipo
 

Fine Mark. Please post the results. When you tune a signal try to compare between two vfo, internal and external. We await your good news ! 😉
Giuseppe.

Re: MY BITX40 arrived - thanks!

stuart.schaffert <stuart.schaffert@...>
 

Jerry,

 

Here is the body of the original post.

 

Stuart

 

For some months now, we have been working at a low cost, single board QRP SSB transceiver module based on the BITX design. So here is BITX transceiver module for $45. It is 7 MHz, 5 watt SSB transceiver board. Fully tested and working. Something that you can easily fit into a box/case of your choice to make that portable or base station rig. This is an all analog radio with sparkling receiver that takes just 150 ma current and transmitter that providers well over 5 watts of clean audio.


Visit www.hfsigs.com for details


The price of $45 includes international shipping. For shipping related questions, you should write to hfsignals@.... The technical queries can be discussed here.


- farhan



Re: BITX 40 - DDS right connection

Mark W
 

This is the VFO I am building for my BitX 40. Just started it tonight.

Mark

K3MRK

 

 

From: BITX20@... [mailto:BITX20@...]
Sent: Monday, November 28, 2016 9:20 AM
To: BITX20@...
Subject: Re: [BITX20] Re: BITX 40 - DDS right connection

 

 

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

 

DDS VFO Kits

 

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]" <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

 

Re: Bitx 40 board.

Mark W
 

Thanks for the info.

I have started to build the DDS tonight. Hopefully will have ready to go by the weekend.

Where is the blog?

Mark K3MRK

 

 

From: BITX20@... [mailto:BITX20@...]
Sent: Monday, November 28, 2016 1:48 AM
To: BITX20@...
Subject: Re: [BITX20] Bitx 40 board.

 

 

Hi Mark, I confirm the drift problem, if you change the six resistor from 100 to 220 ohm this help realy in RX mode. But in TX mode the problem return mybe becauae the PA warm up all the PCB...and make difficult voice qso and impossibile the use with Digital modes. I decide to move to DDS, already Done some tests and it work well. You Can use also an external analog VFO if you want. More info on blog site of hack page. 

73 de ik8yfw

Giuseppe.