Ken Scharf wrote in message . ..
I discovered a lot of pulse transformers. They appear to have primary
and secondary inductance of about 1.5mh and a ratio of 1:1ct

I wonder if they could be used as broadband rf transformers
to make homebrew diode ring mixers?

1.5mH doesn't make them sound very interesting for anything above very
low HF frequencies, if that, and would be too low for AF where 1.5mH
at 1kHz is only about 8 ohms reactance. They might be pretty good for
isolated driving of mosfet gates at a few tens of kHz. You should be
able to find their self-resonant frequency, and my guess is it will be
in the vicinity of 2MHz. You probably don't want to try to use them
above their SRF.

Do you have a manufacturer's part number? Can you look up what they
are recommending them for?

Cheers,
Tom

I discovered a lot of pulse transformers. They appear to have primary
and secondary inductance of about 1.5mh and a ratio of 1:1ct

I wonder if they could be used as broadband rf transformers
to make homebrew diode ring mixers?
---------------------------
I don't think they will work very well, you really need transmission line
transformers wound on suitable cores for diode ring mixers.
=======
Perhaps not suitable for higher RF frequencies ,but these transformers can
be readily used for AF ,for example to provide galvanic separation between
a PC (soundcard) and a radio for operating digital modes like PSK31 etc .

Frank GM0CSZ / KN6WH

Ken Scharf wrote in message . ..
I discovered a lot of pulse transformers. They appear to have primary
and secondary inductance of about 1.5mh and a ratio of 1:1ct

I wonder if they could be used as broadband rf transformers
to make homebrew diode ring mixers?

1.5mH doesn't make them sound very interesting for anything above very
low HF frequencies, if that, and would be too low for AF where 1.5mH
at 1kHz is only about 8 ohms reactance. They might be pretty good for
isolated driving of mosfet gates at a few tens of kHz. You should be
able to find their self-resonant frequency, and my guess is it will be
in the vicinity of 2MHz. You probably don't want to try to use them
above their SRF.

Do you have a manufacturer's part number? Can you look up what they
are recommending them for?

Cheers,
Tom

They might be useful in the range 20-200kHz with 50 ohm, see the notes
on http://www.noding.com/pictures/la8ak/n12.htm where it is some notes
to describe inductance requirements for toroid transformers
(all text is not written, tried to use word, but it was a disaster, so
I have to wait and look for another html editor to finish the page)

Many of us have already confirmed that pulse transformers may work
perfectly well in linear circuits, so I wonder if the comments that
they shouldn't is only based on lack of practical experience, any
ferrite transformers may even be used as memory for old type computers

73
Jan-Martin

On Sat, 15 May 2004 16:38:46 -0400, Ken Scharf
wrote:

I discovered a lot of pulse transformers. They appear to have primary
and secondary inductance of about 1.5mh and a ratio of 1:1ct

I wonder if they could be used as broadband rf transformers
to make homebrew diode ring mixers?

Behold, J M Noeding signalled from keyed 4-1000A filament:

They might be useful in the range 20-200kHz with 50 ohm, see the notes
on http://www.noding.com/pictures/la8ak/n12.htm.......

Yay! Another tubehead! :-)

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca

Behold, J M Noeding signalled from keyed 4-1000A filament:

They might be useful in the range 20-200kHz with 50 ohm, see the notes
on http://www.noding.com/pictures/la8ak/n12.htm.......

Yay! Another tubehead! :-)

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca

They might be useful in the range 20-200kHz with 50 ohm, see the notes
on http://www.noding.com/pictures/la8ak/n12.htm where it is some notes
to describe inductance requirements for toroid transformers
(all text is not written, tried to use word, but it was a disaster, so
I have to wait and look for another html editor to finish the page)

Many of us have already confirmed that pulse transformers may work
perfectly well in linear circuits, so I wonder if the comments that
they shouldn't is only based on lack of practical experience, any
ferrite transformers may even be used as memory for old type computers

73
Jan-Martin

On Sat, 15 May 2004 16:38:46 -0400, Ken Scharf
wrote:

I discovered a lot of pulse transformers. They appear to have primary
and secondary inductance of about 1.5mh and a ratio of 1:1ct

I wonder if they could be used as broadband rf transformers
to make homebrew diode ring mixers?