Great Ken, I will try it today myself. I never use more than 220. Joel Caulkins KB6QVI
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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
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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
?
Hi Joel
How's the audio report back to you?
73 Ken
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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
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Mark, This is the official bitx40 hack blog:
73 Giuseppe, ik8yfw
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Re: BITX 40 - DDS right connection
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.
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Re: MY BITX40 arrived - thanks!
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.
The price of $45 includes international shipping. For
shipping related questions, you should write to hfsignals@.... The technical queries
can be discussed here.
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Re: BITX 40 - DDS right connection
This is the VFO I am building for my BitX 40. Just started it tonight. Mark K3MRK ? ?
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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:?)?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. ? ? 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.? ?
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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 ? ?
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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.?
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Anyone up for a BitX-Net?
Ok, now there's nearly enough of us around to *nearly* make a Net.
Regional, probably - unless you're perched on the coast of Maine, with a Log-Periodic
pointed to the European continent, of course.
I have officially achieved Transmit.
Nice too - I had to back down my BFO frequency (as measured) by about 300 Hz just
to get the audio right (tested with my Yaesu FT-897 listening via dummy load).
I have a pesky short somewhere - in jiggling the board, there's something up around the PA power
area, so before I run it up to 24VDC PA power, I'll have to suss that out.
Thanks to M. Farhan and his collective, and the group.
Mike Y, KM5Z
Dallas, Texas
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Good stuff Joel. I am very pleased with the BItx40, even though the sound is bassy. I'll(you'll) will figure it out.
I'm actually thing of making it into a 40/20 rig. Just getting used to the arduino code.
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
?
Hi Joel
How's the audio report back to you?
73 Ken
|
Ah Ha! #771 has arrived safely in Cincinnati, OH. Thanks Darryl. The shack has rather low light levels and I'm old.
Jack, W8TEE
From: "darryl@... [BITX20]"
To: bitx20@...
Cc: bitx20@...
Sent: Monday, November 28, 2016 9:41 PM
Subject: Re: [BITX20] Re: Bitx40 #861 arrived
?
It should be written in Black ink on the PCB next to a #.
?
?
On 2016-11-29 01:37 PM, Jack Purdum econjack@... [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]"
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
?
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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
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Show quoted text
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
|
It should be written in Black ink on the PCB next to a #.
?
?
On 2016-11-29 01:37 PM, Jack Purdum econjack@... [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]"
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
?
|
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]"
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
|
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
?
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
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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
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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
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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
?
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
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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
|
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
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You may also be able to drape it over the antenna connector. Try that first without the antenna connected.
73 Ken
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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
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Joel Caulkins/N6ALT