开云体育

ctrl + shift + ? for shortcuts
© 2025 开云体育
  1. BITX20
  2. Messages
Expanded Topics Messages Polls
Date
BITX Mods file

vu3wjm
 

Hi!

Have posted a file with few mods that I have incorporated. It is
possible your version may not require them.

I needed slightly higher IF gain mainly because of poor quality
devices and low recovered audio.

I still need to do a spectogram and confirm the passband. Some
impedence matching maybe also required.

Sorry for poor quality PDF, looking for better schematic software.

73

Rahul VU3WJM
New file uploaded to BITX20

[email protected]
 

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the BITX20
group.

File : /BITX 20 V1,2&3 /BITXmod.pdf
Uploaded by : vu3wjm <vu3wjm@...>
Description : BITX mods and shunt IF amp arrangement

You can access this file at the URL:


To learn more about file sharing for your group, please visit:


Regards,

vu3wjm <vu3wjm@...>
Re: VU BITXers

Rahul Srivastava
 

Hi! Arv
?
I did make a layout incorporating new changes. Unfortunately only legal software with me is EasyPC dos bought in 90s for all?it was worth then?, it still proves to be the work horse.
If I need the benefit of new versions I simply import its file do the necessary changes in demo version and save the print file. I will try to post the updated mods but the pdfs dont come out that good.?
?
The IF mod ie the shunt feedback design is based on the IF stage of NORCAL NC 20 a completely discreet design. Rest all other mods have been already suggested on group by our friends world wide. Like the doubly balanced mixer audio changes etc. The linear even follows the the trifilar mod. Surely I have recommended all making the board to put a bead on? PA fet? gate leads. I was forced to incorporate the IF mod not because it lacks in performance in BITX design but unfortunately the stock devices , mainly chinese that we get here in abt far east are not up to the mark.
?
Just now I get a call the ver3 apperas to be a much better performer than the earlier version, need to check it out tomorrow.
?
73
?
Rahul VU3WJM
?
PS:
?
Lately I found that ?this diptrace software is also good:
?
?
I could have have edited the original schematics but I feel Farhan work must carry his credits. I will try posting??the mods incorporating the changes.
?
?


Arv Evans wrote:
Rahul

Has anybody drawn up an updated schematic to show the changes from?
Farhan's original circuit?? If available, this might help others upgrade?
their older BITX20 units, and could help new builders focus on the newer?
design.

Thanks,

Arv K7HKL
_._

On Fri, 22 Apr 2005 22:08:57 -0700 (PDT), Rahul Srivastava?
wrote:

>
> Hi!
>
> Many BITX are on air on 20 now in VU. In my city we have made 4 nos. 2?
> sets were made using the Ver 2 PCB I posted in group earlier.
>
> We faced a minor problem as the local BC547s were not giving sufficient?
> gain on 20 so we modified the IF amp Q3 stage by adding one more?
> transistor to make it a shunt feedback amp. Now the rig is real hot and?
> audio level more than enough even on inefficient antennas.
>
> Incorporating these changes I have made Ver3 PCB.? The front end device?
> Q1 is 2SC2570A a 5Ghz low noise cheap CATV transistor. The mixer has now?
> been made doubly balanced. IF amp slightly modified.
>
> PA board has been also done it includes PSU as well. A portable BW TV?
> transformer is used? AC 18V. Unreg DC is given to IRF PA. LM317?
> regulates to 13.6V for operation of rest of the rig . 2 Small on board?
> cube relays do the necessary changeover. Unfortunately C-E leads of?
> driver 2N3866 had been swapped in layout. We noticed it too late 10nos?
> board had already been made.
>
> Will try posting some of the ver3 board pic. Ver2 is already there in?
> archives.
>
> 73
>
> Rahul VU3WJM
>
>
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam?? Yahoo! Mail has the best spam protection around
>



--
Expore all the Ideas...Exploit the good ones!

__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
Re: VU BITXers

Arv Evans
 

Rahul

Has anybody drawn up an updated schematic to show the changes from Farhan's original circuit? If available, this might help others upgrade their older BITX20 units, and could help new builders focus on the newer design.

Thanks,

Arv K7HKL
_._

On Fri, 22 Apr 2005 22:08:57 -0700 (PDT), Rahul Srivastava <vu3wjm@...> wrote:


Hi!

Many BITX are on air on 20 now in VU. In my city we have made 4 nos. 2 sets were made using the Ver 2 PCB I posted in group earlier.

We faced a minor problem as the local BC547s were not giving sufficient gain on 20 so we modified the IF amp Q3 stage by adding one more transistor to make it a shunt feedback amp. Now the rig is real hot and audio level more than enough even on inefficient antennas.

Incorporating these changes I have made Ver3 PCB. The front end device Q1 is 2SC2570A a 5Ghz low noise cheap CATV transistor. The mixer has now been made doubly balanced. IF amp slightly modified.

PA board has been also done it includes PSU as well. A portable BW TV transformer is used AC 18V. Unreg DC is given to IRF PA. LM317 regulates to 13.6V for operation of rest of the rig . 2 Small on board cube relays do the necessary changeover. Unfortunately C-E leads of driver 2N3866 had been swapped in layout. We noticed it too late 10nos board had already been made.

Will try posting some of the ver3 board pic. Ver2 is already there in archives.

73

Rahul VU3WJM



__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
--
Expore all the Ideas...Exploit the good ones!
Re: First QSO with BITX17 !

Ron Brink
 

Dear Arv and Ruud,
Really appreciate your responses ! Yes, I am still puzzled by the results of yesterday. Will write some extra notes on my homepage to celebrate this " First Contact on 17 " event. Saw that my QTH-Zoetermeer near the Dutch coast?to Thessaloniki in Greece makes a 1920 km distance. Not bad with 5 (five) Watts RF.
Arv, I used the conventional Huff&Puff circuit (quite succesful I might say) as Klaas Spaargaren launched a couple of years ago. The circuitdiagram is on my BITX17-dedicated-webpage:? --> zenders (tx) ---> BITX17. Also visible?in the photo-folder of this group (PA2RF).
But when Hans has completed the minimalist (2 ic) huff&puff kit I really would like to try that circuit. It is a great design I think.
Will see if I can make some new contacts this afternoon on 17m. 17:00 utc seems to be a good time now in Holland to make some qrp (semi)dx !
But now I go bicycling with my children, the weather is great now in Holland, clear blue sky and 18 degrees C. Not a good idea to stay inside near the soldering station...
?
73 de Ron
PA2RF


Arv Evans wrote:

Ron

Congratulations on your joining the "BITX-On-The-Air" group. Your web
page looks quite interesting as well. I liked the morse sound effects
between pages.

Did you use the original H&P Circuit or the less complex version from the
HuffPuffVFO group? The H&P design by Hans G0UPL is a bit easier to build
and calibtrate than prior designs based on the original by Klaas.

Arv
_._

On Fri, 22 Apr 2005 13:45:53 -0600, Ron wrote:

>
> Dear BITX-homebrew-gents,
>
> This afternoon, I made my first QSO on 17m with the BITX17 !
> I am really surprised. My qrp RTTY signal from the west of Holland
> reached Greece SV with RST 559.
> I used MixW2.1 on a Celeron 266 MHz PC to generate RTTY. In fact my
> goal has been achieved. 3 months ago I wanted to make a digimode QSO
> with the BITX on this (for me) un-explored 17m WARC band.
> I wrote a story about my BITX17 on my RF homebrew website:
>
> http://home.versatel.nl/laar60 --> zenders (tx) ---> BITX17
>
> It is still in Dutch, but the picts might give you an idea how things
> look like. Still a lot of challenges... psk31 / cw / ssb qso's and
> finally make a nice front for the rig which covers my ' ugly '
> building method.
> After all, the BITX is a great rig. Spent only a few euro's on the X-
> tal filter and used a lot of ordinary BC945 transistors (euro 0,10
> each). Lots of chapeaux to the designer of this rig!!
> =====================================
>
> FIRST 17M QSO WITH HOMEBREW BITX17
> 22 APR 2005
> 17:11 UTC
> 18.106 MHz
>
> CQ CQ CQ DE SV2DGH SV2DGH SV2DGH
> CQ CQ CQ DE SV2DGH SV2DGH SV2DGH
> PSE K
>
> SV2DGH SV2DGH de PA2RF PA2RF PSE K
>
> PA2RF PA2RF DE SV2DGH
> GA, TNX 4 CALL,
> UR RST 559 559,
> NAME: CHRIS CHRIS
> QTH: THESSALONIKI,
> REGION: MAKEDONIA, NORTHERN GREECE
> LOC: KN10LM
> HW CPY ??
> PA2RF DE SV2DGH BTU HPHJRHX
> =====SV2DGH SV2DGH de PA2RF PA2RF
> +++++++++++++++++++
>
> Great isn't it with only 5 Watts from an MOSFET IRF510 ..
> All you guys have a fb weekend !
> 73 de Ron
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
> To visit your group on the web, go to:
> http://groups.yahoo.com/group/BITX20/
>
> To unsubscribe from this group, send an email to:
> BITX20-unsubscribe@...
>
> Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.



--
Using Opera's revolutionary e-mail client: http://www.opera.com/mail/



Yahoo! Groups Links

<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/BITX20/

<*> To unsubscribe from this group, send an email to:
BITX20-unsubscribe@...

<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/




Do you Yahoo!?
Yahoo! Mail - 250MB free storage.

Betr: First QSO with BITX17 !

[email protected]
 

Hi Ron,

Congratulations with your first QSO! You experience the same excitement as
I did with only 5 watt digital CW on 20 meters. This is really amateur radio!
Lots of fun.

73

Ruud
PE2BS


-- Oorspronkelijk bericht --
To: BITX20@...
From: "Ron" <pa2rf@...>
Date: Fri, 22 Apr 2005 19:45:53 -0000
Subject: [BITX20] First QSO with BITX17 !
Reply-To: BITX20@...




Dear BITX-homebrew-gents,

This afternoon, I made my first QSO on 17m with the BITX17 !
I am really surprised. My qrp RTTY signal from the west of Holland
reached Greece SV with RST 559.
I used MixW2.1 on a Celeron 266 MHz PC to generate RTTY. In fact my
goal has been achieved. 3 months ago I wanted to make a digimode QSO
with the BITX on this (for me) un-explored 17m WARC band.
I wrote a story about my BITX17 on my RF homebrew website:

--> zenders (tx) ---> BITX17

It is still in Dutch, but the picts might give you an idea how things
look like. Still a lot of challenges... psk31 / cw / ssb qso's and
finally make a nice front for the rig which covers my ' ugly '
building method.
After all, the BITX is a great rig. Spent only a few euro's on the X-
tal filter and used a lot of ordinary BC945 transistors (euro 0,10
each). Lots of chapeaux to the designer of this rig!!
=====================================

FIRST 17M QSO WITH HOMEBREW BITX17
22 APR 2005
17:11 UTC
18.106 MHz

CQ CQ CQ DE SV2DGH SV2DGH SV2DGH
CQ CQ CQ DE SV2DGH SV2DGH SV2DGH
PSE K

SV2DGH SV2DGH de PA2RF PA2RF PSE K

PA2RF PA2RF DE SV2DGH
GA, TNX 4 CALL,
UR RST 559 559,
NAME: CHRIS CHRIS
QTH: THESSALONIKI,
REGION: MAKEDONIA, NORTHERN GREECE
LOC: KN10LM
HW CPY ??
PA2RF DE SV2DGH BTU HPHJRHX
=====SV2DGH SV2DGH de PA2RF PA2RF
+++++++++++++++++++

Great isn't it with only 5 Watts from an MOSFET IRF510 ..
All you guys have a fb weekend !
73 de Ron









Yahoo! Groups Links







_____________________________________________________________________

Je eigen persoonlijk e-mailadres bij Tiscali? Registreer nu
een domeinnaam bij Tiscali. Ga naar

New file uploaded to BITX20

[email protected]
 

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the BITX20
group.

File : /BITX 20 V1,2&3 /palayout.pdf
Uploaded by : vu3wjm <vu3wjm@...>
Description : Linear board with PSU and switching

You can access this file at the URL:


To learn more about file sharing for your group, please visit:


Regards,

vu3wjm <vu3wjm@...>
VU BITXers

Rahul Srivastava
 

Hi!

Many BITX are on air on 20 now in VU. In?my city we have made 4 nos.?2 sets were made using the Ver 2 PCB?I posted in group earlier.

We faced a minor problem as the local BC547s were not giving sufficient gain on 20 so we modified the IF amp Q3 stage by adding one more transistor to make it a shunt feedback amp. Now the rig is real hot and audio level more than enough even on inefficient antennas.

Incorporating these changes I have made Ver3 PCB. ?The front end device Q1?is 2SC2570A a 5Ghz low noise cheap?CATV transistor. The mixer has now been made doubly balanced.?IF amp slightly modified.

PA board has been also done it includes PSU as well. A portable BW TV transformer is used ?AC 18V. Unreg DC is given to IRF PA. LM317 regulates to 13.6V for operation of rest of the rig . 2 Small on board cube relays do the necessary changeover. Unfortunately C-E leads of driver 2N3866 had been swapped in layout. We noticed it too late 10nos board had already been made.

Will try?posting some of the ver3 board pic. Ver2?is already there in archives.

73

Rahul VU3WJM??

?

__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
Re: BITX VXOs

Wijaya, Julius
 

Hi miguel,

i am doing an experiment on 12MHz xtal VXO, i could get 35kHz or more range to it,
the only thing is i use ony 1 xtal, getting more range, means getting more drift.

here's the details for my experiment, this 12MHz VXO when mixed with 10MHz LO could produce 2MHz signal.



i tried with lower xtal, but it just didn't oscilate, will keep doing an experiment on that.

rgds
julius

* REPLY SEPARATOR *

On 4/20/2005 at 11:31 AM Miguel Angelo Bartie wrote:

Hello

I build 3 VXOs called "hipervxos" for 40m, 20, and 10m to use with BITX,
They use a classic Colpits oscilattor with 3 parallel xtals and a
series inductor (special) and a series variable capacitor
For 40m I use 3 x 3020 kHz xtals and the actual range is 2068 to 3010kHz
For 20m I use a commercial 3 x 4194 kHz xtals covering 4190 to 3990 kHz
For 10m I use a commercial 3 x 18432 kHz xtals covering 18400 to
18000kHz.
The BITX 40m is running good, the 20m still in test (but is ok too),
and the 10m version I built only the VXO.
The exciter and the PA are the same I change the vfo, the band pass
filter and the low pass filter.
I will make some pictures and I will post here.

73 from PY2OHH Miguel









Yahoo! Groups Links
Re: First QSO with BITX17 !

Arv Evans
 

Ron

Congratulations on your joining the "BITX-On-The-Air" group. Your web page looks quite interesting as well. I liked the morse sound effects between pages.

Did you use the original H&P Circuit or the less complex version from the HuffPuffVFO group? The H&P design by Hans G0UPL is a bit easier to build and calibtrate than prior designs based on the original by Klaas.

Arv
_._

On Fri, 22 Apr 2005 13:45:53 -0600, Ron <pa2rf@...> wrote:


Dear BITX-homebrew-gents,

This afternoon, I made my first QSO on 17m with the BITX17 !
I am really surprised. My qrp RTTY signal from the west of Holland
reached Greece SV with RST 559.
I used MixW2.1 on a Celeron 266 MHz PC to generate RTTY. In fact my
goal has been achieved. 3 months ago I wanted to make a digimode QSO
with the BITX on this (for me) un-explored 17m WARC band.
I wrote a story about my BITX17 on my RF homebrew website:

--> zenders (tx) ---> BITX17

It is still in Dutch, but the picts might give you an idea how things
look like. Still a lot of challenges... psk31 / cw / ssb qso's and
finally make a nice front for the rig which covers my ' ugly '
building method.
After all, the BITX is a great rig. Spent only a few euro's on the X-
tal filter and used a lot of ordinary BC945 transistors (euro 0,10
each). Lots of chapeaux to the designer of this rig!!
=====================================

FIRST 17M QSO WITH HOMEBREW BITX17
22 APR 2005
17:11 UTC
18.106 MHz

CQ CQ CQ DE SV2DGH SV2DGH SV2DGH
CQ CQ CQ DE SV2DGH SV2DGH SV2DGH
PSE K

SV2DGH SV2DGH de PA2RF PA2RF PSE K

PA2RF PA2RF DE SV2DGH
GA, TNX 4 CALL,
UR RST 559 559,
NAME: CHRIS CHRIS
QTH: THESSALONIKI,
REGION: MAKEDONIA, NORTHERN GREECE
LOC: KN10LM
HW CPY ??
PA2RF DE SV2DGH BTU HPHJRHX
=====SV2DGH SV2DGH de PA2RF PA2RF
+++++++++++++++++++

Great isn't it with only 5 Watts from an MOSFET IRF510 ..
All you guys have a fb weekend !
73 de Ron







Yahoo! Groups Links

To visit your group on the web, go to:


To unsubscribe from this group, send an email to:
BITX20-unsubscribe@...

Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
--
Using Opera's revolutionary e-mail client:

R: First QSO with BITX17 !

I0SKK - Alessandro Santucci
 

Great Ron,
congrats! Well done! It's the good of home-brew and of QRP!

72

Alex I0SKK




-----Messaggio originale-----
Da: BITX20@... [mailto:BITX20@...]Per conto di
Ron
Inviato: venerd??? 22 aprile 2005 21.46
A: BITX20@...
Oggetto: [BITX20] First QSO with BITX17 !




Dear BITX-homebrew-gents,

This afternoon, I made my first QSO on 17m with the BITX17 !
I am really surprised. My qrp RTTY signal from the west of Holland
reached Greece SV with RST 559.
I used MixW2.1 on a Celeron 266 MHz PC to generate RTTY. In fact my
goal has been achieved. 3 months ago I wanted to make a digimode QSO
with the BITX on this (for me) un-explored 17m WARC band.
I wrote a story about my BITX17 on my RF homebrew website:

--> zenders (tx) ---> BITX17

It is still in Dutch, but the picts might give you an idea how things
look like. Still a lot of challenges... psk31 / cw / ssb qso's and
finally make a nice front for the rig which covers my ' ugly '
building method.
After all, the BITX is a great rig. Spent only a few euro's on the X-
tal filter and used a lot of ordinary BC945 transistors (euro 0,10
each). Lots of chapeaux to the designer of this rig!!
=====================================

FIRST 17M QSO WITH HOMEBREW BITX17
22 APR 2005
17:11 UTC
18.106 MHz

CQ CQ CQ DE SV2DGH SV2DGH SV2DGH
CQ CQ CQ DE SV2DGH SV2DGH SV2DGH
PSE K

SV2DGH SV2DGH de PA2RF PA2RF PSE K

PA2RF PA2RF DE SV2DGH
GA, TNX 4 CALL,
UR RST 559 559,
NAME: CHRIS CHRIS
QTH: THESSALONIKI,
REGION: MAKEDONIA, NORTHERN GREECE
LOC: KN10LM
HW CPY ??
PA2RF DE SV2DGH BTU HPHJRHX
=====SV2DGH SV2DGH de PA2RF PA2RF
+++++++++++++++++++

Great isn't it with only 5 Watts from an MOSFET IRF510 ..
All you guys have a fb weekend !
73 de Ron









Yahoo! Groups Links







--
No virus found in this incoming message.
Checked by AVG Anti-Virus.
Version: 7.0.308 / Virus Database: 266.10.2 - Release Date: 21/04/05

--
No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.0.308 / Virus Database: 266.10.2 - Release Date: 21/04/05
test

Mike W
 

new ISP, I can't post to the group but receiving ok.
just a posting test sorry.
Mike W, G8NXD
First QSO with BITX17 !

Ron
 

Dear BITX-homebrew-gents,

This afternoon, I made my first QSO on 17m with the BITX17 !
I am really surprised. My qrp RTTY signal from the west of Holland
reached Greece SV with RST 559.
I used MixW2.1 on a Celeron 266 MHz PC to generate RTTY. In fact my
goal has been achieved. 3 months ago I wanted to make a digimode QSO
with the BITX on this (for me) un-explored 17m WARC band.
I wrote a story about my BITX17 on my RF homebrew website:

--> zenders (tx) ---> BITX17

It is still in Dutch, but the picts might give you an idea how things
look like. Still a lot of challenges... psk31 / cw / ssb qso's and
finally make a nice front for the rig which covers my ' ugly '
building method.
After all, the BITX is a great rig. Spent only a few euro's on the X-
tal filter and used a lot of ordinary BC945 transistors (euro 0,10
each). Lots of chapeaux to the designer of this rig!!
=====================================

FIRST 17M QSO WITH HOMEBREW BITX17
22 APR 2005
17:11 UTC
18.106 MHz

CQ CQ CQ DE SV2DGH SV2DGH SV2DGH
CQ CQ CQ DE SV2DGH SV2DGH SV2DGH
PSE K

SV2DGH SV2DGH de PA2RF PA2RF PSE K

PA2RF PA2RF DE SV2DGH
GA, TNX 4 CALL,
UR RST 559 559,
NAME: CHRIS CHRIS
QTH: THESSALONIKI,
REGION: MAKEDONIA, NORTHERN GREECE
LOC: KN10LM
HW CPY ??
PA2RF DE SV2DGH BTU HPHJRHX
=====SV2DGH SV2DGH de PA2RF PA2RF
+++++++++++++++++++

Great isn't it with only 5 Watts from an MOSFET IRF510 ..
All you guys have a fb weekend !
73 de Ron
Re: BITX VXOs

Rahul Srivastava
 

Dear Miguel,
?
Hi!
?
This all is very interesting. I feel some correction is in order for 80mts range mentioned. But what I am more interested is the 18mhz tuning you mention, it makes making a 20mtr radio with 4mhz IF and 18mhz LO a snap. 400khz range gives more than adequate 20mtrs coverage.
?
Worth trying.
?
Greetings and 73
?
Rahul VU3WJM
?


Miguel Angelo Bartie wrote:

Hello

I build 3 VXOs called "hipervxos" for 40m, 20, and 10m to use with BITX,
They use a classic Colpits oscilattor with 3 parallel xtals and a
series? inductor (special) and a series variable capacitor
For 40m I use 3 x 3020 kHz xtals and the actual range is 2068 to 3010kHz
For 20m I use a commercial 3 x 4194 kHz xtals covering 4190 to 3990 kHz
For 10m I use a commercial 3 x 18432 kHz xtals covering 18400 to
18000kHz.
The BITX 40m is running good, the 20m still in test (but is ok too),
and the 10m version I built only the VXO.
The exciter and the PA are the same I change the vfo, the band pass
filter and the low pass filter.
I will make some pictures and I will post here.

73 from PY2OHH Miguel






__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
Re: BITX VXOs

Ron Brink
 

Ola Miguel,
I like to see some picts of your super VXO's Miguel. Great coverage with only 3 xtals. Is the output stable over the whole range? Do you use one or more (switchable) coils in series with the xtals to cover the range?
?
I have shielded my BIT17 VFO (soldered some unetched PCB's around it) and now the VFO with Huff&Puff is also stable when I force it out-of-tune e.g. by placing the desk-lamp just above the vfo. Added one picture in the photobox.
?
73
Ron
PA2RF

Miguel Angelo Bartie wrote:

Hello

I build 3 VXOs called "hipervxos" for 40m, 20, and 10m to use with BITX,
They use a classic Colpits oscilattor with 3 parallel xtals and a
series? inductor (special) and a series variable capacitor
For 40m I use 3 x 3020 kHz xtals and the actual range is 2068 to 3010kHz
For 20m I use a commercial 3 x 4194 kHz xtals covering 4190 to 3990 kHz
For 10m I use a commercial 3 x 18432 kHz xtals covering 18400 to
18000kHz.
The BITX 40m is running good, the 20m still in test (but is ok too),
and the 10m version I built only the VXO.
The exciter and the PA are the same I change the vfo, the band pass
filter and the low pass filter.
I will make some pictures and I will post here.

73 from PY2OHH Miguel






Do you Yahoo!?
BITX VXOs

 

Hello

I build 3 VXOs called "hipervxos" for 40m, 20, and 10m to use with BITX,
They use a classic Colpits oscilattor with 3 parallel xtals and a
series inductor (special) and a series variable capacitor
For 40m I use 3 x 3020 kHz xtals and the actual range is 2068 to 3010kHz
For 20m I use a commercial 3 x 4194 kHz xtals covering 4190 to 3990 kHz
For 10m I use a commercial 3 x 18432 kHz xtals covering 18400 to
18000kHz.
The BITX 40m is running good, the 20m still in test (but is ok too),
and the 10m version I built only the VXO.
The exciter and the PA are the same I change the vfo, the band pass
filter and the low pass filter.
I will make some pictures and I will post here.

73 from PY2OHH Miguel
Re: Good Job guys!

Hans Summers
 

Guys

I am planning a Huff Puff VFO kit for my 2-chip minimalist VFO see
. I am
sure that this would be suitable for use with BITX transceivers. I have just
posted a message to the Huff Puff forum
about what possible features to
include in the kit. Hoping to keep the cost as absolutely minimal as
possible!

73 Hans G0UPL

-----Original Message-----
From: Arv Evans [mailto:arvevans@...]
Sent: 10 April 2005 18:52
To: BITX20@...
Subject: Re: [BITX20] Re: Good Job guys!



Troy

H&P stabilisation would hold your frequency to within a Hz or two for the
long term, thus minimizing even a slow drift after warm up. Hans has come
up with several minimalist stabilizer designs (a "One-Chip", a "two-chip"
and a minimalist version of the "Fast Stabilizer"). These circuits may be
found on the <HUFFPUFFVFO.yahoogroups.com> forum. Hans' stabilizer circuits
may be made to lock onto 16, 32, or 64 Hz tuning steps. The one and two
chip designs use a 32.768 KHz watch crystal (salvage one from a cheap watch
purchased at the local dollar store).driving a 74HC4060 binary counter for
the timebase.

I have looked before at that receiver and counter on the web page you
suggested. Hans G0UPL's web page also has some minimalist counters that
could be adapted to your L.O. output, as does Onno PA2OHH
<www.qsl.net/pa2ohh/sfreq.htm> and Miguel PY2OHH
<>.

Arv
_._

On Sun, 10 Apr 2005 16:53:53 -0000, kc8afu1965 <kc8afu1965@...>
wrote:


Thanks Arv,

I've had the AFU callsign for about ten years and you're the first
person to comment on it. I thought it was funny when it was first
assigned to me but nobody seemed to share my sense of humor. Thanks
for noticing!

Thanks for the huff&puff invite. I've also been looknig at Hans
Summers website and I'm thinking about trying it out. My current CW
rcvr is the popcorn rcvr from the qrp homebuilder homepage. It has an
LO freq of approx 2.5 MHz (4.433 MHz IF)and is pretty stable ( I think
I remember about 2Hz per minute after warm-up but it's been a while
since I measured it so I could be wrong) but I am intrigued by the
H&P. Lately I have been finishing up a presettable frequency counter
that I can run directly off of my VFO. Now I know where I am on the
band. It can be found at:



It's at the bottom of the homepage.
Thanks for the invite and I will start checking out the H&P group.

73's & HPE CUL.

Troy
KC8AFU
--- In BITX20@..., "Arv Evans" <arvevans@e...> wrote:
Troy

The BITX has also been used for CW. Several builders have added
a
center-of-the-filter
BFO oscillator that serves both send and receive CW functions. I
took the
simple way and
just added a keyed AF oscillator that plugs into the mike jack.

Love the callsign. I'll bet you get a few comments about it
though!

I did not see your name in the members list for the Huff and Puff
group so
I will go
over there and send you an invite. The Huff & Puff VFO group
forum is a
logical
extension to the BITX because using an H & P circuit to stabilize
your
BITX oscillator
makes it into a very stable but still inexpensive rig that is
capable of
working with
narrow filters for CW and PSK/MSK contacts.

Arv K7HKL




Yahoo! Groups Links

To visit your group on the web, go to:


To unsubscribe from this group, send an email to:
BITX20-unsubscribe@...

Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.


--
Expore all the Ideas...Exploit the good ones!



Yahoo! Groups Links
Re: Good Job guys!

Ron
 

Tnx for your reply dear Mike,
I did the measurement with a Philips low-budget "world" receiver
(with BFO :-) )
connected to a Celeron 266 MHz PC using MixW2.10 and I suspect this
radio causing most of the anomalies you indicated. And yes, I live in
a pretty EM-noisy environment (GSM, wifi antennas and lot of building
activities like cranes with 70cm devices in the vicinity).
73
Ron
PA2RF

--- In BITX20@..., "Mike W" <mike@c...> wrote:
Impressive Ron, Not a criticism, but I note some products of the
VFO
some distance from the carrier in the unlocked pic which are not
noticable when the HuffPuff is operative due to the other noises. I
guess you must live in a noisy enviroment.
thanks for the pics though.
atb Mike W, G8NXD
--

Bye from Holland Ron PA2RF
> stable but still inexpensive rig that is > capable of > > working
with > > narrow filters for CW and PSK/MSK contacts. > > > > Arv
K7HKL






Yahoo! Groups Links
Re: Good Job guys!

Mike W
 

Impressive Ron, Not a criticism, but I note some products of the VFO
some distance from the carrier in the unlocked pic which are not
noticable when the HuffPuff is operative due to the other noises. I
guess you must live in a noisy enviroment.
thanks for the pics though.
atb Mike W, G8NXD
--

On 11 Apr 2005 at 7:26, Ron wrote:



Dear Troy,

Would like to inform you that I included the Huff&Puff circuit into my
BITX17 (converted BITX20 for 18.068...18.168 MHz). In my Photobox
(PA2RF) you can see 2 pictures of the VFO performance made with
MixW.2.10. (witout and with Huff&Puff). The results were (and still
are) amazing! I can easily decode PSK31, RTTY and other digimodes now.
Bye from Holland Ron PA2RF

--- In BITX20@..., "kc8afu1965" <kc8afu1965@y...> wrote: >
Thanks Arv, > > I've had the AFU callsign for about ten years and
you're the first > person to comment on it. I thought it was funny
when it was first > assigned to me but nobody seemed to share my sense
of humor. Thanks > for noticing! > > Thanks for the huff&puff invite.
I've also been looknig at Hans > Summers website and I'm thinking
about trying it out. My current CW > rcvr is the popcorn rcvr from
the qrp homebuilder homepage. It has > an LO freq of approx 2.5 MHz
(4.433 MHz IF)and is pretty stable ( I > think I remember about 2Hz
per minute after warm-up but it's been a > while since I measured it
so I could be wrong) but I am intrigued by > the H&P. Lately I have
been finishing up a presettable frequency > counter that I can run
directly off of my VFO. Now I know where I am > on the band. It can be
found at: > > > > It's
at the bottom of the homepage. > Thanks for the invite and I will
start checking out the H&P group. > > 73's & HPE CUL. > > Troy >
KC8AFU > --- In BITX20@..., "Arv Evans" <arvevans@e...>
wrote: > > Troy > > > > The BITX has also been used for CW. Several
builders have added > a > > center-of-the-filter > > BFO oscillator
that serves both send and receive CW functions. I > took the > >
simple way and > > just added a keyed AF oscillator that plugs into
the mike jack. > > > > Love the callsign. I'll bet you get a few
comments about it > though! > > > > I did not see your name in the
members list for the Huff and Puff > group so > > I will go > > over
there and send you an invite. The Huff & Puff VFO group > forum is a
logical > > extension to the BITX because using an H & P circuit
to stabilize > your > > BITX oscillator > > makes it into a very
stable but still inexpensive rig that is > capable of > > working
with > > narrow filters for CW and PSK/MSK contacts. > > > > Arv K7HKL






Yahoo! Groups Links
Re: Good Job guys!

Ron
 

Dear Troy,

Would like to inform you that I included the Huff&Puff circuit into
my BITX17 (converted BITX20 for 18.068...18.168 MHz). In my Photobox
(PA2RF) you can see 2 pictures of the VFO performance made with
MixW.2.10. (witout and with Huff&Puff). The results were (and still
are) amazing! I can easily decode PSK31, RTTY and other digimodes now.
Bye from Holland
Ron
PA2RF

--- In BITX20@..., "kc8afu1965" <kc8afu1965@y...> wrote:

Thanks Arv,

I've had the AFU callsign for about ten years and you're the first
person to comment on it. I thought it was funny when it was first
assigned to me but nobody seemed to share my sense of humor. Thanks
for noticing!

Thanks for the huff&puff invite. I've also been looknig at Hans
Summers website and I'm thinking about trying it out. My current
CW
rcvr is the popcorn rcvr from the qrp homebuilder homepage. It has
an LO freq of approx 2.5 MHz (4.433 MHz IF)and is pretty stable (
I
think I remember about 2Hz per minute after warm-up but it's been a
while since I measured it so I could be wrong) but I am intrigued
by
the H&P. Lately I have been finishing up a presettable frequency
counter that I can run directly off of my VFO. Now I know where I
am
on the band. It can be found at:



It's at the bottom of the homepage.
Thanks for the invite and I will start checking out the H&P group.

73's & HPE CUL.

Troy
KC8AFU
--- In BITX20@..., "Arv Evans" <arvevans@e...> wrote:
Troy

The BITX has also been used for CW. Several builders have added
a
center-of-the-filter
BFO oscillator that serves both send and receive CW functions. I
took the
simple way and
just added a keyed AF oscillator that plugs into the mike jack.

Love the callsign. I'll bet you get a few comments about it
though!

I did not see your name in the members list for the Huff and Puff
group so
I will go
over there and send you an invite. The Huff & Puff VFO group
forum is a
logical
extension to the BITX because using an H & P circuit to stabilize
your
BITX oscillator
makes it into a very stable but still inexpensive rig that is
capable of
working with
narrow filters for CW and PSK/MSK contacts.

Arv K7HKL
114901 - 114920 of 115609