Date   
Re: LED Display - More Info

david.g3ryp <david.g3ryp@...>
 

Hi Mike - me too please Can you let me know what the UK postage will be and I'll stick something in the post. Still at 12 Boskenna Rd?
 
David

----- Original Message -----
From: Mike W
Sent: Monday, October 04, 2004 11:15 AM
Subject: [BITX20] LED Display - More Info

Hi folks,

A little further info on  the LED display I have available.

Common Kathode .
Size 36mm x 20mm
7 Multiplexed numeric characters
7 _NON _ multiplexed leds in a bargraph.

They are ideal for use with an OM3CPH PIC frequency display. I know
as I built one last night !. On Veroboard ( stripboard ) I managed to
get the size down to the front area of the Display and 1/2" depth
behind. The PIC clock can be taken direct from the CIO osc ,
therefore eliminating any chances of mixing of PIC and other
oscillators. Resolution to 10Hz

see the available data that I have made available at..

http:\www.qsl.net\g8nxd\files\ledconn.pdf

At 1.00 UKP each plus postage costs to anywhere on Earth. They are
going very quickly ( I have about 30 left ). I really must keep a few
for myself !

72/73 de Mike W, G8NXD qthr


Re: LED Display - More Info

Hans Summers <Hans.Summers@...>
 

Hi Mike

I can't immediately think of an appropriate application and I tried all
morning to resist your offer, but I have failed! I would like one to play
with please, if there are any left ;-) What's the UK postage come to?

73 Hans G0UPL

-----Original Message-----
From: Mike W [mailto:mike@...]
Sent: 04 October 2004 11:16
To: BITX20@...
Subject: [BITX20] LED Display - More Info



Hi folks,

A little further info on the LED display I have available.

Common Kathode .
Size 36mm x 20mm
7 Multiplexed numeric characters
7 _NON _ multiplexed leds in a bargraph.

They are ideal for use with an OM3CPH PIC frequency display. I know
as I built one last night !. On Veroboard ( stripboard ) I managed to
get the size down to the front area of the Display and 1/2" depth
behind. The PIC clock can be taken direct from the CIO osc ,
therefore eliminating any chances of mixing of PIC and other
oscillators. Resolution to 10Hz

see the available data that I have made available at..

http:&#92;www.qsl.net&#92;g8nxd&#92;files&#92;ledconn.pdf

At 1.00 UKP each plus postage costs to anywhere on Earth. They are
going very quickly ( I have about 30 left ). I really must keep a few
for myself !

72/73 de Mike W, G8NXD qthr





Yahoo! Groups Links

Re: LED Display - More Info

Charles Darley
 

Hi all

Mike data is on http://www.qsl.net/g8nxd/files/ledconn.pdf

Regards Charles G4VSZ

 

-----Original Message-----
From: Mike W [mailto:mike@...]
Sent: 04 October 2004 11:16
To: BITX20@...
Subject: [BITX20] LED Display - More Info

Hi folks,

A little further info on  the LED display I have available.

Common Kathode .
Size 36mm x 20mm
7 Multiplexed numeric characters
7 _NON _ multiplexed leds in a bargraph.

They are ideal for use with an OM3CPH PIC frequency display. I know
as I built one last night !. On Veroboard ( stripboard ) I managed to
get the size down to the front area of the Display and 1/2" depth
behind. The PIC clock can be taken direct from the CIO osc ,
therefore eliminating any chances of mixing of PIC and other
oscillators. Resolution to 10Hz

see the available data that I have made available at..

http:\www.qsl.net\g8nxd\files\ledconn.pdf

At 1.00 UKP each plus postage costs to anywhere on Earth. They are
going very quickly ( I have about 30 left ). I really must keep a few
for myself !

72/73 de Mike W, G8NXD qthr


LED Display - More Info

Mike W <mike@...>
 

Hi folks,

A little further info on the LED display I have available.

Common Kathode .
Size 36mm x 20mm
7 Multiplexed numeric characters
7 _NON _ multiplexed leds in a bargraph.

They are ideal for use with an OM3CPH PIC frequency display. I know
as I built one last night !. On Veroboard ( stripboard ) I managed to
get the size down to the front area of the Display and 1/2" depth
behind. The PIC clock can be taken direct from the CIO osc ,
therefore eliminating any chances of mixing of PIC and other
oscillators. Resolution to 10Hz

see the available data that I have made available at..

http:&#92;www.qsl.net&#92;g8nxd&#92;files&#92;ledconn.pdf

At 1.00 UKP each plus postage costs to anywhere on Earth. They are
going very quickly ( I have about 30 left ). I really must keep a few
for myself !

72/73 de Mike W, G8NXD qthr

request regarding asoc examination.

fromgautam <fromgautam@...>
 

Respected sir,
With due respect I beg to say that I am preparing for ASOC grade-1
and advance grade examination. Recently I was appeared in ASOC grade-
1 and grade-2 examination, which was held on 08/09/04 in begusarai,
bihar. I think that I should cleared grade-2 exam. I have following
books for preparing of examination. These are as follows:-
1. ABC of amateur Radio by Sri rajesh verma (vu2rvm) by EFY
2. A guide to Ham Radio by Sri sandeep baruah(vu2mue ex. Vu2msy)
by Vigyan Prasar.
3. Scanning the world with amateur radio by Sri sandeep baruah
(vu2mue ex. Vu2msy) by Etherial whisper group.
4. Ham radio by prof. A.Ponnusamy(vu2aps) and Sri P.Parthiban
(vu2ppb) by Bright Publishers.
5. Guide to Amateur Radio in India by Sri Saad Ali (vu2st).
6. Amateur radio made easy by Sri Manotosh Das Gupta (vu2mdg) by
Calcutta vhf amateur radio society.

After viewing the latest question paper of grade-1 and Advance grade
examination I concluded that above mentioned books are not sufficient
for part-1(Radio theory & practice) of grade-1 and advance grade
examination.

The latest pattern of question paper is such type that , they(WPC)
wants that examinee knows all the electronics theory of graduate
level and this examination is not for amateur enthusiast.
I therefore request all of you kindly suggest me appropriate books
for grade-1 and advance grade(satellite communication) as early as
possible because my next examination will be tentatively held on
feb.2005

Thanks,
With 73's
De kumar gautam
Qth :-
S/o Sri girish chandra choudhary,
Mohalla – Mishratola,
P.O. + Distt.- Darbhanga,
Bihar-846004
E-mail :- fromgautam@...

Re: Extra capacitors in your BITX...?

Rahul Srivastava
 

Hi!
 
Arv,
 
This area is indeed a new ball game all to gether.But it indeed represents a some new concepts. I hope we can have a ckt consistant with the general available components. I would be only too glad to make a board based on that for my friends.
 
TNX once again for adding fuel to the hombrew fire. 
 
73
 
Rahul VU3WJM
 
 
 
 


Arvid Evans wrote:
Dear Rahul

Thank you for the information on RU area transceivers.  It will take a
while to translate and understand all this, but it is very interesting
reading.

Thanks,
Arv K7HKL
_._

--- In BITX20@..., Rahul Srivastava wrote:
> Dear Hans and Arv

> Hi!

> It is indeed pleasure to see some interest in ones post. I find this
as a case of history repeating itself. Similar on the line of two
different concept that evolved during development of a space suit one
a 7 layered design and other in RU teritories almirah door type ones.

> Hams I see you did some serious work on the hammer/ screwdriver page
( This is what i comprehend from the icon). At times it appeared funny
to see something translated like the administration is done by change
it pressure. Ultimately it boiled down to to freq control is manged by
change in voltage, a description of PLL sections.

> A brief lineup of RU designs would be in order for RU TRXs, UW3DI,
Ural84, Desna, Don-M and many others with some peculiar characters.

> Now on the topic there are another few page of these region that
also need some looking into for hombrew projects:

> http://ra3ggi.qrz.ru/

> and yet another

> http://www.qsl.net/sp3abg/index.html

> Hope all enjoy.

> 73

> Rahul VU3WJM

>
> Hans Summers wrote:

> BITX'ers

> Note that if you want to see an English translation, you could try
the Altavista "babel fish" see
http://babelfish.altavista.com/babelfish/tr. You can type in the web
page, and view the translated web page. It's rather neat. The
translation is obviously not perfect but it's quite easy to follow the
ideas. If you look at the home page http://www.cqham.ru/index.phtml
you'll find all kind of gems. Numerous transceiver projects etc. Also
many downloaded QST articles, and more. There is an English flag on
the home page which provides a translation, but it does not work as
well as the Altavista page.

> 73 Hans G0UPL
> http://www.HansSummers.com
>
> -----Original Message-----
> From: Rahul Srivastava [mailto:vu3wjm@y...]
> Sent: 01 October 2004 06:57
> To: BITX20@...
> Subject: Re: [BITX20] Extra capacitors in your BITX...?
>
>
> Dear Arv,

> From what I could make out of mechanical translations, the concept
among RU friends was popularised with Ural 84 design. Desna was the
more updated version probably it means dew.

> the RU page for Desna design is here:

> http://www.cqham.ru/desna.htm

> The main board ckt I am posting under files section for thers to
have a look at another way of implimenting Bi-directional concept.

> 73

> Rahul VU3WJM



>
>
> Arv Evans wrote:
> Rahul-VU3WJM
>
> I did a search (using Google) for :Ural 84" and for "Desna" and did
find some textual mention of these units, but I did not find any web
sites that showed equipment or schematics.  Do you have a URL that we
might use to see schematics for this equipment?
>
> Thanks,
> Arv-K7HKL
> _._
>
> On Wed, 2004-09-29 at 22:17, Rahul Srivastava wrote: Hi!

> On mention of PSK mini I also suggest looking at RU designs Ural 84
and Desna. Similar concepts are used there while using bipolar
transistors.

> I am sure the coupling caps for filters can be removed.  Had I been
and audiophile  I would  like not to have even one of them in signal path.

> 73

> Rahul VU3WJM


>
> Arvid Evans wrote: Hello
>
> As I sit here looking at the BITX20 schematic it 0ccured to me that
> some of the capacitors may not be necessary:
>
>   1)  There is a 0.1 mf on the base of Q1, that connects to a 0.1 on
> the collector of Q13.  These then connect via a 10 pf to the front-end
> bandpass filter.  Would it not be acceptable to use only one 0.1 mf
> between the collector of Q13 and the Base of Q1, and connect the base
> of Q1 to the bandpass filter via the 10 pf cap?
>
>   2)  There is a 0.1 mf on the collector of Q2 that connects to the
> crystal filter, and another 0.1 that connects the base of Q12 to the
> same point on the crystal filter.  Would it be sufficient to use just
> the 0.1 mf from the collector of Q2 to the crystal filter, and then
> connect the base of Q12 directly to the same point on that filter?
> Since crystals do not pass DC, the same amount of DC isolation would
> be maintained.
>
>   3)  There is a 0.1 mf between the end of the crystal filter and the
> base of Q3, and another 0.1 mf between that same point on the crystal
> filter and the collector of Q11.  It seems that it would suffice to
> have the 0.1 mf between the collector of Q11 and the base of Q3, with
> the crystal filter simply connected to the base of Q3.  Again, the
> crystal does not conduct DC, so there would still be the same level of
> DC isolation.
>
> OK, for all you purists out there, I know that it looks more
> symetrical with the "pairs of 0.1 mf capacitors", but are they really
> necessary?
>
> What spawned this evaluation is my comparison of RV3GM's PSK-20
> schematic with the BITX20 design by Farhan.  I was wondering if Oleg's
> method of using one transister in bi-directional mode could also be
> applied to the BITX20 where we are using pairs of transisters to
> obtain bi-directionality. 
>
> Arv-K7HKL
> _._
>
>
>
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LED Frequency Display

Mike W <mike@...>
 

Hi folks,
I don't know if this will interest anyone. But I have just obtained a
fairly large quantity of minature multiplexed 7 segment LED displays.
They have 7 numeric characters and 7 'S' meter, like leds in a
bargraph. and fit into a standard 28 pin DIL socket.

They would be ideal for use with an OM3CPH PIC frequency display for
the BITX

see picture at
http:&#92;www.qsl.net&#92;g8nxd&#92;files&#92;LEDS.gif

I'm a little unsure about what they are worth but if anyone would
like one for 1.00 UKP plus postage to anywhere on Earth.
Then please give me a shout off list.

My BITX20 is still not finished but it will be soon. Congrats to all
builders who have finished theirs. I hope to work you on 20m soon

72/73 de Mike W, G8NXD qthr

Re: BITX20 Photos

Arv Evans <arvevans@...>
 

Pete

Congratulations on the very good looking BITX20 transceiver.  That LCD display is a good
addition.

Arv K7HKL
_._
On Sat, 2004-10-02 at 05:25, vdberghak wrote:
Looks good Pete!
First I searched in your directory but I found them in the main
directory.
Indeed building the circuit in some kind of box is may be the
hardest part.
I am still thinking about the best construction to make the dial
knob on the capacitor... ;-(
Best regards,
Chris.

--- In BITX20@..., "kaliediscope2004"
wrote:
> Greetings fellow BITX20 Builders. I have just uploaded some photos
> of my BITX20 in the newly completed homebrew enclosure. Still need
> to add the sides and top but the hard part is mostly done.
>
> This is one FB radio and I have had many enjoyable QSO's with the
> little radio. Am looking forward to a possible 2X QSO with another
> BITX20.
>
> 73's
> Pete W6JFR


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  • New file uploaded to BITX20

    BITX20@...
     

    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 : /MODIFICATIONS/Schema VXO.gif
    Uploaded by : vdberghak <vdberghak@...>
    Description : 13 MHZ VXO for BITX17

    You can access this file at the URL:
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    To learn more about file sharing for your group, please visit:
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    Regards,

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    Re: BITX20 Photos

    Chris van den Berg
     

    Looks good Pete!
    First I searched in your directory but I found them in the main
    directory.
    Indeed building the circuit in some kind of box is may be the
    hardest part.
    I am still thinking about the best construction to make the dial
    knob on the capacitor... ;-(
    Best regards,
    Chris.

    --- In BITX20@..., "kaliediscope2004"
    <kaliediscope2004@y...> wrote:
    Greetings fellow BITX20 Builders. I have just uploaded some photos
    of my BITX20 in the newly completed homebrew enclosure. Still need
    to add the sides and top but the hard part is mostly done.

    This is one FB radio and I have had many enjoyable QSO's with the
    little radio. Am looking forward to a possible 2X QSO with another
    BITX20.

    73's
    Pete W6JFR

    Re: Extra capacitors in your BITX...?

    Arvid Evans <arvevans@...>
     

    Dear Rahul

    Thank you for the information on RU area transceivers. It will take a
    while to translate and understand all this, but it is very interesting
    reading.

    Thanks,
    Arv K7HKL
    _._

    --- In BITX20@..., Rahul Srivastava <vu3wjm@y...> wrote:
    Dear Hans and Arv

    Hi!

    It is indeed pleasure to see some interest in ones post. I find this
    as a case of history repeating itself. Similar on the line of two
    different concept that evolved during development of a space suit one
    a 7 layered design and other in RU teritories almirah door type ones.

    Hams I see you did some serious work on the hammer/ screwdriver page
    ( This is what i comprehend from the icon). At times it appeared funny
    to see something translated like the administration is done by change
    it pressure. Ultimately it boiled down to to freq control is manged by
    change in voltage, a description of PLL sections.

    A brief lineup of RU designs would be in order for RU TRXs, UW3DI,
    Ural84, Desna, Don-M and many others with some peculiar characters.

    Now on the topic there are another few page of these region that
    also need some looking into for hombrew projects:

    http://ra3ggi.qrz.ru/

    and yet another

    http://www.qsl.net/sp3abg/index.html

    Hope all enjoy.

    73

    Rahul VU3WJM


    Hans Summers <Hans.Summers@t...> wrote:

    BITX'ers

    Note that if you want to see an English translation, you could try
    the Altavista "babel fish" see
    http://babelfish.altavista.com/babelfish/tr. You can type in the web
    page, and view the translated web page. It's rather neat. The
    translation is obviously not perfect but it's quite easy to follow the
    ideas. If you look at the home page http://www.cqham.ru/index.phtml
    you'll find all kind of gems. Numerous transceiver projects etc. Also
    many downloaded QST articles, and more. There is an English flag on
    the home page which provides a translation, but it does not work as
    well as the Altavista page.

    73 Hans G0UPL
    http://www.HansSummers.com

    -----Original Message-----
    From: Rahul Srivastava [mailto:vu3wjm@y...]
    Sent: 01 October 2004 06:57
    To: BITX20@...
    Subject: Re: [BITX20] Extra capacitors in your BITX...?


    Dear Arv,

    From what I could make out of mechanical translations, the concept
    among RU friends was popularised with Ural 84 design. Desna was the
    more updated version probably it means dew.

    the RU page for Desna design is here:

    http://www.cqham.ru/desna.htm

    The main board ckt I am posting under files section for thers to
    have a look at another way of implimenting Bi-directional concept.

    73

    Rahul VU3WJM





    Arv Evans <arvevans@e...> wrote:
    Rahul-VU3WJM

    I did a search (using Google) for :Ural 84" and for "Desna" and did
    find some textual mention of these units, but I did not find any web
    sites that showed equipment or schematics. Do you have a URL that we
    might use to see schematics for this equipment?

    Thanks,
    Arv-K7HKL
    _._

    On Wed, 2004-09-29 at 22:17, Rahul Srivastava wrote: Hi!

    On mention of PSK mini I also suggest looking at RU designs Ural 84
    and Desna. Similar concepts are used there while using bipolar
    transistors.

    I am sure the coupling caps for filters can be removed. Had I been
    and audiophile I would like not to have even one of them in signal path.

    73

    Rahul VU3WJM



    Arvid Evans <arvevans@e...> wrote: Hello

    As I sit here looking at the BITX20 schematic it 0ccured to me that
    some of the capacitors may not be necessary:

    1) There is a 0.1 mf on the base of Q1, that connects to a 0.1 on
    the collector of Q13. These then connect via a 10 pf to the front-end
    bandpass filter. Would it not be acceptable to use only one 0.1 mf
    between the collector of Q13 and the Base of Q1, and connect the base
    of Q1 to the bandpass filter via the 10 pf cap?

    2) There is a 0.1 mf on the collector of Q2 that connects to the
    crystal filter, and another 0.1 that connects the base of Q12 to the
    same point on the crystal filter. Would it be sufficient to use just
    the 0.1 mf from the collector of Q2 to the crystal filter, and then
    connect the base of Q12 directly to the same point on that filter?
    Since crystals do not pass DC, the same amount of DC isolation would
    be maintained.

    3) There is a 0.1 mf between the end of the crystal filter and the
    base of Q3, and another 0.1 mf between that same point on the crystal
    filter and the collector of Q11. It seems that it would suffice to
    have the 0.1 mf between the collector of Q11 and the base of Q3, with
    the crystal filter simply connected to the base of Q3. Again, the
    crystal does not conduct DC, so there would still be the same level of
    DC isolation.

    OK, for all you purists out there, I know that it looks more
    symetrical with the "pairs of 0.1 mf capacitors", but are they really
    necessary?

    What spawned this evaluation is my comparison of RV3GM's PSK-20
    schematic with the BITX20 design by Farhan. I was wondering if Oleg's
    method of using one transister in bi-directional mode could also be
    applied to the BITX20 where we are using pairs of transisters to
    obtain bi-directionality.

    Arv-K7HKL
    _._



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    ====================================
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    * Project Management
    * Deployment
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    BITX20 Photos

    kaliediscope2004 <kaliediscope2004@...>
     

    Greetings fellow BITX20 Builders. I have just uploaded some photos
    of my BITX20 in the newly completed homebrew enclosure. Still need
    to add the sides and top but the hard part is mostly done.

    This is one FB radio and I have had many enjoyable QSO's with the
    little radio. Am looking forward to a possible 2X QSO with another
    BITX20.

    73's
    Pete W6JFR

    Re: Extra capacitors in your BITX...?

    Rahul Srivastava
     

    Dear Hans and Arv
     
    Hi!
     
    It is indeed pleasure to see some interest in ones post. I find this as a case of history repeating itself. Similar on the line of two different concept that evolved during development of a space suit one a 7 layered design and other in RU teritories almirah door type ones.
     
    Hams I see you did some serious work on the hammer/ screwdriver page ( This is what i comprehend from the icon). At times it appeared funny to see something translated like the administration is done by change it pressure. Ultimately it boiled down to to freq control is manged by change in voltage, a description of PLL sections.
     
    A brief lineup of RU designs would be in order for RU TRXs, UW3DI, Ural84, Desna, Don-M and many others with some peculiar characters.
     
    Now on the topic there are another few page of these region that also need some looking into for hombrew projects:
     
     
    and yet another
     
     
    Hope all enjoy.
     
    73
     
    Rahul VU3WJM
     

    Hans Summers wrote:
     
    BITX'ers
     
    Note that if you want to see an English translation, you could try the Altavista "babel fish" see http://babelfish.altavista.com/babelfish/tr. You can type in the web page, and view the translated web page. It's rather neat. The translation is obviously not perfect but it's quite easy to follow the ideas. If you look at the home page http://www.cqham.ru/index.phtml you'll find all kind of gems. Numerous transceiver projects etc. Also many downloaded QST articles, and more. There is an English flag on the home page which provides a translation, but it does not work as well as the Altavista page.
     
    73 Hans G0UPL
    http://www.HansSummers.com
    -----Original Message-----
    From: Rahul Srivastava [mailto:vu3wjm@...]
    Sent: 01 October 2004 06:57
    To: BITX20@...
    Subject: Re: [BITX20] Extra capacitors in your BITX...?

    Dear Arv,
     
    From what I could make out of mechanical translations, the concept among RU friends was popularised with Ural 84 design. Desna was the more updated version probably it means dew.
     
    the RU page for Desna design is here:
     
     
    The main board ckt I am posting under files section for thers to have a look at another way of implimenting Bi-directional concept. 
     
    73
     
    Rahul VU3WJM
     
     
     


    Arv Evans wrote:
    Rahul-VU3WJM

    I did a search (using Google) for :Ural 84" and for "Desna" and did find some textual mention of these units, but I did not find any web sites that showed equipment or schematics.  Do you have a URL that we might use to see schematics for this equipment?

    Thanks,
    Arv-K7HKL
    _._

    On Wed, 2004-09-29 at 22:17, Rahul Srivastava wrote:
    Hi!
     
    On mention of PSK mini I also suggest looking at RU designs Ural 84 and Desna. Similar concepts are used there while using bipolar transistors.
     
    I am sure the coupling caps for filters can be removed.  Had I been and audiophile  I would  like not to have even one of them in signal path.
     
    73
     
    Rahul VU3WJM
     
     

    Arvid Evans wrote:
    Hello

    As I sit here looking at the BITX20 schematic it 0ccured to me that
    some of the capacitors may not be necessary:

      1)  There is a 0.1 mf on the base of Q1, that connects to a 0.1 on
    the collector of Q13.  These then connect via a 10 pf to the front-end
    bandpass filter.  Would it not be acceptable to use only one 0.1 mf
    between the collector of Q13 and the Base of Q1, and connect the base
    of Q1 to the bandpass filter via the 10 pf cap?

      2)  There is a 0.1 mf on the collector of Q2 that connects to the
    crystal filter, and another 0.1 that connects the base of Q12 to the
    same point on the crystal filter.  Would it be sufficient to use just
    the 0.1 mf from the collector of Q2 to the crystal filter, and then
    connect the base of Q12 directly to the same point on that filter?
    Since crystals do not pass DC, the same amount of DC isolation would
    be maintained.

      3)  There is a 0.1 mf between the end of the crystal filter and the
    base of Q3, and another 0.1 mf between that same point on the crystal
    filter and the collector of Q11.  It seems that it would suffice to
    have the 0.1 mf between the collector of Q11 and the base of Q3, with
    the crystal filter simply connected to the base of Q3.  Again, the
    crystal does not conduct DC, so there would still be the same level of
    DC isolation.

    OK, for all you purists out there, I know that it looks more
    symetrical with the "pairs of 0.1 mf capacitors", but are they really
    necessary?

    What spawned this evaluation is my comparison of RV3GM's PSK-20
    schematic with the BITX20 design by Farhan.  I was wondering if Oleg's
    method of using one transister in bi-directional mode could also be
    applied to the BITX20 where we are using pairs of transisters to
    obtain bi-directionality. 

    Arv-K7HKL
    _._



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    Re: Extra capacitors in your BITX...?

    Arvid Evans <arvevans@...>
     

    Rahul & Hans

    Thanks for the info on the RU designed Desna Xcvr. It is interesting
    that they used a valve-type linear instead of solid state.

    In the Desna design, Vt2 and VT3 layouts do show one way of obtaining
    proper bias when using BJTs in a bi-directional layout.

    After looking at the Desna and the PSK-20 by RV3GM, I opened Eagle CAD
    and put together a quick conceptual drawing of a minimalist DSB Xcvr
    layout that uses this switched bidirectional amplifier idea. The
    result has been uploaded to <BITX20/FILES/K7HKL/DSB-Mite "Conceptual
    Drawing".gif> if anyone wants to look and comment.
    NOTE: THIS IS A CONCEPTUAL DRAWING ONLY...NOT TESTED...DO NOT BUILD
    FROM THIS DRAWING.

    73
    Arv-K7HKL

    --- In BITX20@..., Hans Summers <Hans.Summers@t...> wrote:

    BITX'ers

    Note that if you want to see an English translation, you could try the
    Altavista "babel fish" see http://babelfish.altavista.com/babelfish/tr
    <http://babelfish.altavista.com/babelfish/tr> . You can type in the web
    page, and view the translated web page. It's rather neat. The
    translation is
    obviously not perfect but it's quite easy to follow the ideas. If
    you look
    at the home page http://www.cqham.ru/index.phtml
    <http://www.cqham.ru/index.phtml> you'll find all kind of gems.
    Numerous
    transceiver projects etc. Also many downloaded QST articles, and
    more. There
    is an English flag on the home page which provides a translation, but it
    does not work as well as the Altavista page.

    73 Hans G0UPL
    http://www.HansSummers.com

    -----Original Message-----
    From: Rahul Srivastava [mailto:vu3wjm@y...]
    Sent: 01 October 2004 06:57
    To: BITX20@...
    Subject: Re: [BITX20] Extra capacitors in your BITX...?


    Dear Arv,

    From what I could make out of mechanical translations, the concept
    among RU
    friends was popularised with Ural 84 design. Desna was the more updated
    version probably it means dew.

    the RU page for Desna design is here:

    http://www.cqham.ru/desna.htm <http://www.cqham.ru/desna.htm>

    The main board ckt I am posting under files section for thers to
    have a look
    at another way of implimenting Bi-directional concept.

    73

    Rahul VU3WJM





    Arv Evans <arvevans@e...> wrote:

    Rahul-VU3WJM

    I did a search (using Google) for :Ural 84" and for "Desna" and did find
    some textual mention of these units, but I did not find any web
    sites that
    showed equipment or schematics. Do you have a URL that we might use
    to see
    schematics for this equipment?

    Thanks,
    Arv-K7HKL
    _._

    On Wed, 2004-09-29 at 22:17, Rahul Srivastava wrote:

    Hi!

    On mention of PSK mini I also suggest looking at RU designs Ural 84 and
    Desna. Similar concepts are used there while using bipolar transistors.

    I am sure the coupling caps for filters can be removed. Had I been and
    audiophile I would like not to have even one of them in signal path.

    73

    Rahul VU3WJM



    Arvid Evans <arvevans@e...> wrote:

    Hello

    As I sit here looking at the BITX20 schematic it 0ccured to me that
    some of the capacitors may not be necessary:

    1) There is a 0.1 mf on the base of Q1, that connects to a 0.1 on
    the collector of Q13. These then connect via a 10 pf to the front-end
    bandpass filter. Would it not be acceptable to use only one 0.1 mf
    between the collector of Q13 and the Base of Q1, and connect the base
    of Q1 to the bandpass filter via the 10 pf cap?

    2) There is a 0.1 mf on the collector of Q2 that connects to the
    crystal filter, and another 0.1 that connects the base of Q12 to the
    same point on the crystal filter. Would it be sufficient to use just
    the 0.1 mf from the collector of Q2 to the crystal filter, and then
    connect the base of Q12 directly to the same point on that filter?
    Since crystals do not pass DC, the same amount of DC isolation would
    be maintained.

    3) There is a 0.1 mf between the end of the crystal filter and the
    base of Q3, and another 0.1 mf between that same point on the crystal
    filter and the collector of Q11. It seems that it would suffice to
    have the 0.1 mf between the collector of Q11 and the base of Q3, with
    the crystal filter simply connected to the base of Q3. Again, the
    crystal does not conduct DC, so there would still be the same level of
    DC isolation.

    OK, for all you purists out there, I know that it looks more
    symetrical with the "pairs of 0.1 mf capacitors", but are they really
    necessary?

    What spawned this evaluation is my comparison of RV3GM's PSK-20
    schematic with the BITX20 design by Farhan. I was wondering if Oleg's
    method of using one transister in bi-directional mode could also be
    applied to the BITX20 where we are using pairs of transisters to
    obtain bi-directionality.

    Arv-K7HKL
    _._



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    Re: Extra capacitors in your BITX...?

    Hans Summers <Hans.Summers@...>
     

     
    BITX'ers
     
    Note that if you want to see an English translation, you could try the Altavista "babel fish" see http://babelfish.altavista.com/babelfish/tr. You can type in the web page, and view the translated web page. It's rather neat. The translation is obviously not perfect but it's quite easy to follow the ideas. If you look at the home page http://www.cqham.ru/index.phtml you'll find all kind of gems. Numerous transceiver projects etc. Also many downloaded QST articles, and more. There is an English flag on the home page which provides a translation, but it does not work as well as the Altavista page.
     
    73 Hans G0UPL
    http://www.HansSummers.com

    -----Original Message-----
    From: Rahul Srivastava [mailto:vu3wjm@...]
    Sent: 01 October 2004 06:57
    To: BITX20@...
    Subject: Re: [BITX20] Extra capacitors in your BITX...?

    Dear Arv,
     
    From what I could make out of mechanical translations, the concept among RU friends was popularised with Ural 84 design. Desna was the more updated version probably it means dew.
     
    the RU page for Desna design is here:
     
     
    The main board ckt I am posting under files section for thers to have a look at another way of implimenting Bi-directional concept. 
     
    73
     
    Rahul VU3WJM
     
     
     


    Arv Evans wrote:
    Rahul-VU3WJM

    I did a search (using Google) for :Ural 84" and for "Desna" and did find some textual mention of these units, but I did not find any web sites that showed equipment or schematics.  Do you have a URL that we might use to see schematics for this equipment?

    Thanks,
    Arv-K7HKL
    _._

    On Wed, 2004-09-29 at 22:17, Rahul Srivastava wrote:
    Hi!
     
    On mention of PSK mini I also suggest looking at RU designs Ural 84 and Desna. Similar concepts are used there while using bipolar transistors.
     
    I am sure the coupling caps for filters can be removed.  Had I been and audiophile  I would  like not to have even one of them in signal path.
     
    73
     
    Rahul VU3WJM
     
     

    Arvid Evans wrote:
    Hello

    As I sit here looking at the BITX20 schematic it 0ccured to me that
    some of the capacitors may not be necessary:

      1)  There is a 0.1 mf on the base of Q1, that connects to a 0.1 on
    the collector of Q13.  These then connect via a 10 pf to the front-end
    bandpass filter.  Would it not be acceptable to use only one 0.1 mf
    between the collector of Q13 and the Base of Q1, and connect the base
    of Q1 to the bandpass filter via the 10 pf cap?

      2)  There is a 0.1 mf on the collector of Q2 that connects to the
    crystal filter, and another 0.1 that connects the base of Q12 to the
    same point on the crystal filter.  Would it be sufficient to use just
    the 0.1 mf from the collector of Q2 to the crystal filter, and then
    connect the base of Q12 directly to the same point on that filter?
    Since crystals do not pass DC, the same amount of DC isolation would
    be maintained.

      3)  There is a 0.1 mf between the end of the crystal filter and the
    base of Q3, and another 0.1 mf between that same point on the crystal
    filter and the collector of Q11.  It seems that it would suffice to
    have the 0.1 mf between the collector of Q11 and the base of Q3, with
    the crystal filter simply connected to the base of Q3.  Again, the
    crystal does not conduct DC, so there would still be the same level of
    DC isolation.

    OK, for all you purists out there, I know that it looks more
    symetrical with the "pairs of 0.1 mf capacitors", but are they really
    necessary?

    What spawned this evaluation is my comparison of RV3GM's PSK-20
    schematic with the BITX20 design by Farhan.  I was wondering if Oleg's
    method of using one transister in bi-directional mode could also be
    applied to the BITX20 where we are using pairs of transisters to
    obtain bi-directionality. 

    Arv-K7HKL
    _._



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    New file uploaded to BITX20

    BITX20@...
     

    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 : /desna.gif
    Uploaded by : vu3wjm <vu3wjm@...>
    Description : Another way to impliment Bi-directional concept.

    You can access this file at the URL:
    http://groups.yahoo.com/group/BITX20/files/desna.gif

    To learn more about file sharing for your group, please visit:
    http://help.yahoo.com/help/us/groups/files

    Regards,

    vu3wjm <vu3wjm@...>

    Re: Extra capacitors in your BITX...?

    Rahul Srivastava
     

    Dear Arv,
     
    From what I could make out of mechanical translations, the concept among RU friends was popularised with Ural 84 design. Desna was the more updated version probably it means dew.
     
    the RU page for Desna design is here:
     
     
    The main board ckt I am posting under files section for thers to have a look at another way of implimenting Bi-directional concept. 
     
    73
     
    Rahul VU3WJM
     
     
     


    Arv Evans wrote:
    Rahul-VU3WJM

    I did a search (using Google) for :Ural 84" and for "Desna" and did find some textual mention of these units, but I did not find any web sites that showed equipment or schematics.  Do you have a URL that we might use to see schematics for this equipment?

    Thanks,
    Arv-K7HKL
    _._

    On Wed, 2004-09-29 at 22:17, Rahul Srivastava wrote:
    Hi!
     
    On mention of PSK mini I also suggest looking at RU designs Ural 84 and Desna. Similar concepts are used there while using bipolar transistors.
     
    I am sure the coupling caps for filters can be removed.  Had I been and audiophile  I would  like not to have even one of them in signal path.
     
    73
     
    Rahul VU3WJM
     
     

    Arvid Evans wrote:
    Hello

    As I sit here looking at the BITX20 schematic it 0ccured to me that
    some of the capacitors may not be necessary:

      1)  There is a 0.1 mf on the base of Q1, that connects to a 0.1 on
    the collector of Q13.  These then connect via a 10 pf to the front-end
    bandpass filter.  Would it not be acceptable to use only one 0.1 mf
    between the collector of Q13 and the Base of Q1, and connect the base
    of Q1 to the bandpass filter via the 10 pf cap?

      2)  There is a 0.1 mf on the collector of Q2 that connects to the
    crystal filter, and another 0.1 that connects the base of Q12 to the
    same point on the crystal filter.  Would it be sufficient to use just
    the 0.1 mf from the collector of Q2 to the crystal filter, and then
    connect the base of Q12 directly to the same point on that filter?
    Since crystals do not pass DC, the same amount of DC isolation would
    be maintained.

      3)  There is a 0.1 mf between the end of the crystal filter and the
    base of Q3, and another 0.1 mf between that same point on the crystal
    filter and the collector of Q11.  It seems that it would suffice to
    have the 0.1 mf between the collector of Q11 and the base of Q3, with
    the crystal filter simply connected to the base of Q3.  Again, the
    crystal does not conduct DC, so there would still be the same level of
    DC isolation.

    OK, for all you purists out there, I know that it looks more
    symetrical with the "pairs of 0.1 mf capacitors", but are they really
    necessary?

    What spawned this evaluation is my comparison of RV3GM's PSK-20
    schematic with the BITX20 design by Farhan.  I was wondering if Oleg's
    method of using one transister in bi-directional mode could also be
    applied to the BITX20 where we are using pairs of transisters to
    obtain bi-directionality. 

    Arv-K7HKL
    _._



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    Re: Extra capacitors in your BITX...?

    Arv Evans <arvevans@...>
     

    Rahul-VU3WJM

    I did a search (using Google) for :Ural 84" and for "Desna" and did find some textual mention of these units, but I did not find any web sites that showed equipment or schematics.  Do you have a URL that we might use to see schematics for this equipment?

    Thanks,
    Arv-K7HKL
    _._

    On Wed, 2004-09-29 at 22:17, Rahul Srivastava wrote:
    Hi!
     
    On mention of PSK mini I also suggest looking at RU designs Ural 84 and Desna. Similar concepts are used there while using bipolar transistors.
     
    I am sure the coupling caps for filters can be removed.  Had I been and audiophile  I would  like not to have even one of them in signal path.
     
    73
     
    Rahul VU3WJM
     
     

    Arvid Evans wrote:
    Hello

    As I sit here looking at the BITX20 schematic it 0ccured to me that
    some of the capacitors may not be necessary:

      1)  There is a 0.1 mf on the base of Q1, that connects to a 0.1 on
    the collector of Q13.  These then connect via a 10 pf to the front-end
    bandpass filter.  Would it not be acceptable to use only one 0.1 mf
    between the collector of Q13 and the Base of Q1, and connect the base
    of Q1 to the bandpass filter via the 10 pf cap?

      2)  There is a 0.1 mf on the collector of Q2 that connects to the
    crystal filter, and another 0.1 that connects the base of Q12 to the
    same point on the crystal filter.  Would it be sufficient to use just
    the 0.1 mf from the collector of Q2 to the crystal filter, and then
    connect the base of Q12 directly to the same point on that filter?
    Since crystals do not pass DC, the same amount of DC isolation would
    be maintained.

      3)  There is a 0.1 mf between the end of the crystal filter and the
    base of Q3, and another 0.1 mf between that same point on the crystal
    filter and the collector of Q11.  It seems that it would suffice to
    have the 0.1 mf between the collector of Q11 and the base of Q3, with
    the crystal filter simply connected to the base of Q3.  Again, the
    crystal does not conduct DC, so there would still be the same level of
    DC isolation.

    OK, for all you purists out there, I know that it looks more
    symetrical with the "pairs of 0.1 mf capacitors", but are they really
    necessary?

    What spawned this evaluation is my comparison of RV3GM's PSK-20
    schematic with the BITX20 design by Farhan.  I was wondering if Oleg's
    method of using one transister in bi-directional mode could also be
    applied to the BITX20 where we are using pairs of transisters to
    obtain bi-directionality. 

    Arv-K7HKL
    _._



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    CONTACT: arvevans@...
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  • Re: Extra capacitors in your BITX...?

    Rahul Srivastava
     

    Hi!
     
    On mention of PSK mini I also suggest looking at RU designs Ural 84 and Desna. Similar concepts are used there while using bipolar transistors.
     
    I am sure the coupling caps for filters can be removed.  Had I been and audiophile  I would  like not to have even one of them in signal path.
     
    73
     
    Rahul VU3WJM
     
     


    Arvid Evans wrote:
    Hello

    As I sit here looking at the BITX20 schematic it 0ccured to me that
    some of the capacitors may not be necessary:

      1)  There is a 0.1 mf on the base of Q1, that connects to a 0.1 on
    the collector of Q13.  These then connect via a 10 pf to the front-end
    bandpass filter.  Would it not be acceptable to use only one 0.1 mf
    between the collector of Q13 and the Base of Q1, and connect the base
    of Q1 to the bandpass filter via the 10 pf cap?

      2)  There is a 0.1 mf on the collector of Q2 that connects to the
    crystal filter, and another 0.1 that connects the base of Q12 to the
    same point on the crystal filter.  Would it be sufficient to use just
    the 0.1 mf from the collector of Q2 to the crystal filter, and then
    connect the base of Q12 directly to the same point on that filter?
    Since crystals do not pass DC, the same amount of DC isolation would
    be maintained.

      3)  There is a 0.1 mf between the end of the crystal filter and the
    base of Q3, and another 0.1 mf between that same point on the crystal
    filter and the collector of Q11.  It seems that it would suffice to
    have the 0.1 mf between the collector of Q11 and the base of Q3, with
    the crystal filter simply connected to the base of Q3.  Again, the
    crystal does not conduct DC, so there would still be the same level of
    DC isolation.

    OK, for all you purists out there, I know that it looks more
    symetrical with the "pairs of 0.1 mf capacitors", but are they really
    necessary?

    What spawned this evaluation is my comparison of RV3GM's PSK-20
    schematic with the BITX20 design by Farhan.  I was wondering if Oleg's
    method of using one transister in bi-directional mode could also be
    applied to the BITX20 where we are using pairs of transisters to
    obtain bi-directionality. 

    Arv-K7HKL
    _._



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    Re: Progress with BITX

    Arv Evans <arvevans@...>
     

    John-G0UCP

    Congratulations on the birth of your new BITX20 transceiver!


    Arv-K7HKL
    _._
    On Wed, 2004-09-29 at 13:02, market10gardener wrote:
    Hi
    I'm pleased to say that my BITX20 is now complete and it performs
    exactly as described. With my 132' doublet it has received excellent
    reports incuding 59 from PJ4 in one direction and UN7 in the other.
    Like Chris I made a few contacts with the penultimate (2N2218) stage
    on its own and these included an island off the coast of ES which was
    satisfying with 100Mw.
    At first the PA was a little unstable so I put in a small (abt 45pf)
    trimmer capacitor from the gate to the drain of the IRF510, lowered
    the value of the 2.2K resistor between the base and collector of the
    2N2218 by putting a 1K resistor in parallel with it and substituted a
    300pf cap for the 0.1mf between the drain of the IRF510 and the low
    pass filter. I now get 4 watts with a 12 volt power supply and 5
    watts with about 13v from a 17 Ah storage battery.
    I heard VU2PEP wkg most of North America (with 200 watts) the other
    evening but the pile up was formidable. It would be nice to meet
    another BITX on the air. Is any one interested in taking one along to
    Rochdale on the 9th October?
    72, 73
    John  G0UCP


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