Xtals for valve tx.
 

I would like to start building valve transmitters for 160/80/40 metres, does
anyone know of any suppliers of suitable xtals for valve equipment eg. the
old FT243 or HC6U types.

Thankyou. Simon G7CPN.

I've just finished my valve 40mtr cw tx and been all round Europe on
it!! great fun, the best xtal supply I've found is
http://www.quartslab.demon.co.uk/
They are very helpful and very well informed, cheap and fast
from Ron g3yuh......



On Fri, 28 Nov 2003 16:01:39 +0000 (UTC), "SB"
wrote:

I would like to start building valve transmitters for 160/80/40 metres, does
anyone know of any suppliers of suitable xtals for valve equipment eg. the
old FT243 or HC6U types.

Thankyou. Simon G7CPN.

I've just finished my valve 40mtr cw tx and been all round Europe on
it!! great fun, the best xtal supply I've found is
http://www.quartslab.demon.co.uk/
They are very helpful and very well informed, cheap and fast
from Ron g3yuh......



On Fri, 28 Nov 2003 16:01:39 +0000 (UTC), "SB"
wrote:

I would like to start building valve transmitters for 160/80/40 metres, does
anyone know of any suppliers of suitable xtals for valve equipment eg. the
old FT243 or HC6U types.

Thankyou. Simon G7CPN.

Thanks for the information Ron, I'll give them a call.

Regards Simon G7CPN.

Ron wrote in message
...

I've just finished my valve 40mtr cw tx and been all round Europe on
it!! great fun, the best xtal supply I've found is
http://www.quartslab.demon.co.uk/
They are very helpful and very well informed, cheap and fast
from Ron g3yuh......
On Fri, 28 Nov 2003 16:01:39 +0000 (UTC), "SB"
wrote:

I would like to start building valve transmitters for 160/80/40 metres,
does
anyone know of any suppliers of suitable xtals for valve equipment eg.
the
old FT243 or HC6U types.

Thankyou. Simon G7CPN.

Thanks for the information Ron, I'll give them a call.

Regards Simon G7CPN.

Ron wrote in message
...

I've just finished my valve 40mtr cw tx and been all round Europe on
it!! great fun, the best xtal supply I've found is
http://www.quartslab.demon.co.uk/
They are very helpful and very well informed, cheap and fast
from Ron g3yuh......
On Fri, 28 Nov 2003 16:01:39 +0000 (UTC), "SB"
wrote:

I would like to start building valve transmitters for 160/80/40 metres,
does
anyone know of any suppliers of suitable xtals for valve equipment eg.
the
old FT243 or HC6U types.

Thankyou. Simon G7CPN.

"SB" wrote in message
...
I would like to start building valve transmitters for 160/80/40 metres,
does
anyone know of any suppliers of suitable xtals for valve equipment eg.
the
old FT243 or HC6U types.

Here's my one-valve CW transmitter, produces up to 10W on 80m and 8W on 40m:
http://www.hanssummers.com/radio/cwtx/index.htm. In this circuit I have
found that modern HC49 type crystals work perfectly well. Before building
it, I was warned that HC49 crystals are too small for valve circuits and
would fracture. Fortunately I decided to give it a go anyway, and have not
yet had a crystal fracture. Some have suggested that this may be due to the
DC blocking capacitor in series with the crystal (see my circuit diagram).

Quartzlab charge £7.50 per crystal (minimum order £10). A cheaper way is to
buy a bunch of standard value crystals and lower them by painting the
crystal surface with felt tip pen, see my page about it:
http://www.hanssummers.com/radio/penning/index.htm. In this way it would be
possible to build up a bank of crystals covering a segment of the band.
3.579 (TV colour burst) crystals are available almost anywhere extremely
cheaply, and I found it easy to lower it by 30KHz. 3.560 crystals are also
available, it's the 80m QRP calling frequency. See the links page on the QRP
website http://www.gqrp.com for some suppliers. Similarly 7.030 (Europe) /
7.040 (US) is the 40m QRP calling frequency, and they can be easily lowered
to anywhere down to 7.000.

My TX has 4 relay switched crystals: 3.558, 3.560, 7.010 and 7.030. All are
(or were originally) HC49. After 2 years and over 400 QSO's, no fracturing.

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

"SB" wrote in message
...
I would like to start building valve transmitters for 160/80/40 metres,
does
anyone know of any suppliers of suitable xtals for valve equipment eg.
the
old FT243 or HC6U types.

Here's my one-valve CW transmitter, produces up to 10W on 80m and 8W on 40m:
http://www.hanssummers.com/radio/cwtx/index.htm. In this circuit I have
found that modern HC49 type crystals work perfectly well. Before building
it, I was warned that HC49 crystals are too small for valve circuits and
would fracture. Fortunately I decided to give it a go anyway, and have not
yet had a crystal fracture. Some have suggested that this may be due to the
DC blocking capacitor in series with the crystal (see my circuit diagram).

Quartzlab charge £7.50 per crystal (minimum order £10). A cheaper way is to
buy a bunch of standard value crystals and lower them by painting the
crystal surface with felt tip pen, see my page about it:
http://www.hanssummers.com/radio/penning/index.htm. In this way it would be
possible to build up a bank of crystals covering a segment of the band.
3.579 (TV colour burst) crystals are available almost anywhere extremely
cheaply, and I found it easy to lower it by 30KHz. 3.560 crystals are also
available, it's the 80m QRP calling frequency. See the links page on the QRP
website http://www.gqrp.com for some suppliers. Similarly 7.030 (Europe) /
7.040 (US) is the 40m QRP calling frequency, and they can be easily lowered
to anywhere down to 7.000.

My TX has 4 relay switched crystals: 3.558, 3.560, 7.010 and 7.030. All are
(or were originally) HC49. After 2 years and over 400 QSO's, no fracturing.

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

Here's my one-valve CW transmitter, produces up to 10W on 80m and 8W on
40m:
http://www.hanssummers.com/radio/cwtx/index.htm. In this circuit I have
found that modern HC49 type crystals work perfectly well. Before building
it, I was warned that HC49 crystals are too small for valve circuits and
would fracture. Fortunately I decided to give it a go anyway, and have not
yet had a crystal fracture. Some have suggested that this may be due to
the
DC blocking capacitor in series with the crystal (see my circuit diagram).

Quartzlab charge £7.50 per crystal (minimum order £10). A cheaper way is
to
buy a bunch of standard value crystals and lower them by painting the
crystal surface with felt tip pen, see my page about it:
http://www.hanssummers.com/radio/penning/index.htm. In this way it would
be
possible to build up a bank of crystals covering a segment of the band.
3.579 (TV colour burst) crystals are available almost anywhere extremely
cheaply, and I found it easy to lower it by 30KHz. 3.560 crystals are also
available, it's the 80m QRP calling frequency. See the links page on the
QRP
website http://www.gqrp.com for some suppliers. Similarly 7.030 (Europe) /
7.040 (US) is the 40m QRP calling frequency, and they can be easily
lowered
to anywhere down to 7.000.

My TX has 4 relay switched crystals: 3.558, 3.560, 7.010 and 7.030. All
are
(or were originally) HC49. After 2 years and over 400 QSO's, no
fracturing.

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

Hello Hans,

Thankyou very much for the information regarding the xtals, I have been to
your site many times to admire the equipment you build and is it that which
has inspired me to build a piece or pieces of valve equipment.

Thankyou again,

Simon G7CPN.

Here's my one-valve CW transmitter, produces up to 10W on 80m and 8W on
40m:
http://www.hanssummers.com/radio/cwtx/index.htm. In this circuit I have
found that modern HC49 type crystals work perfectly well. Before building
it, I was warned that HC49 crystals are too small for valve circuits and
would fracture. Fortunately I decided to give it a go anyway, and have not
yet had a crystal fracture. Some have suggested that this may be due to
the
DC blocking capacitor in series with the crystal (see my circuit diagram).

Quartzlab charge £7.50 per crystal (minimum order £10). A cheaper way is
to
buy a bunch of standard value crystals and lower them by painting the
crystal surface with felt tip pen, see my page about it:
http://www.hanssummers.com/radio/penning/index.htm. In this way it would
be
possible to build up a bank of crystals covering a segment of the band.
3.579 (TV colour burst) crystals are available almost anywhere extremely
cheaply, and I found it easy to lower it by 30KHz. 3.560 crystals are also
available, it's the 80m QRP calling frequency. See the links page on the
QRP
website http://www.gqrp.com for some suppliers. Similarly 7.030 (Europe) /
7.040 (US) is the 40m QRP calling frequency, and they can be easily
lowered
to anywhere down to 7.000.

My TX has 4 relay switched crystals: 3.558, 3.560, 7.010 and 7.030. All
are
(or were originally) HC49. After 2 years and over 400 QSO's, no
fracturing.

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

Hello Hans,

Thankyou very much for the information regarding the xtals, I have been to
your site many times to admire the equipment you build and is it that which
has inspired me to build a piece or pieces of valve equipment.

Thankyou again,

Simon G7CPN.