On a sunny day (Sat, 21 Feb 2004 19:22:15 +0000) it happened Paul Burridge
wrote in
:

On Sat, 21 Feb 2004 18:22:44 +0000, Leon Heller
wrote:



Paul Burridge wrote:
Anyone care to nominate an RF mixer chip for 100Mhz that's readily
available in the UK?

What sort of performance is required?

"Good." :-)

Diode mixers are easy to obtain
and have good IMD characteristics. The impedances on the ports need to
be properly matched.

What - the sort of crossed diode config one often sees in the ham
design books? Do you think I might as well just make one up from
discretes? I'm basically just trying to combine 60Mhz with 20Mhz to
end up with the difference frequency in this case. JJ suggested a
chip, but looking at the data sheet, it seemed to be designed more as
a modulator than a mixer. Let's not get into an argument over
semantics but y'all know what I mean, I'm sure.

BTW, thanks for a good steer with the Pulsonix suggestion, Leon. I'm
making good progress getting to grips with it.
I do this with a dual gate MOSFET, osc on second gate, signal on first.
A voltage divider on gate 2 to set it in teh non-linear part.
This works very well, is not critical, very cheap and extremely reliable.
Also the noise figure is good.
So tuned 40MHz in drain
I did one some weeks agao, but cant remember what that was for?
Anyway that sceme works up to a GHz , from kHz up.
If you need diagram and part example I could draw up one here.
Copyright Jan Panteltje 2004 All Right Reserved
By reading this you agree to pay me 1 fc.

Paul Burridge wrote:
On Sat, 21 Feb 2004 18:22:44 +0000, Leon Heller
wrote:



Paul Burridge wrote:

Anyone care to nominate an RF mixer chip for 100Mhz that's readily
available in the UK?

What sort of performance is required?


"Good." :-)


Diode mixers are easy to obtain
and have good IMD characteristics. The impedances on the ports need to
be properly matched.


What - the sort of crossed diode config one often sees in the ham
design books? Do you think I might as well just make one up from
discretes? I'm basically just trying to combine 60Mhz with 20Mhz to
end up with the difference frequency in this case. JJ suggested a
chip, but looking at the data sheet, it seemed to be designed more as
a modulator than a mixer. Let's not get into an argument over
semantics but y'all know what I mean, I'm sure.

You could make your own, but an MCL TUF-1 or SBL-1 won't be all that
expensive. They do need a 7 dBm local oscillator drive level.


BTW, thanks for a good steer with the Pulsonix suggestion, Leon. I'm
making good progress getting to grips with it.

You could join the Pulsonix UG:

http://groups.yahoo.com/group/PulsonixUG/

Leon
--
Leon Heller, G1HSM
Email:
My low-cost Philips LPC210x ARM development system:
http://www.geocities.com/leon_heller/lpc2104.html

Paul Burridge wrote:
On Sat, 21 Feb 2004 18:22:44 +0000, Leon Heller
wrote:



Paul Burridge wrote:

Anyone care to nominate an RF mixer chip for 100Mhz that's readily
available in the UK?

What sort of performance is required?


"Good." :-)


Diode mixers are easy to obtain
and have good IMD characteristics. The impedances on the ports need to
be properly matched.


What - the sort of crossed diode config one often sees in the ham
design books? Do you think I might as well just make one up from
discretes? I'm basically just trying to combine 60Mhz with 20Mhz to
end up with the difference frequency in this case. JJ suggested a
chip, but looking at the data sheet, it seemed to be designed more as
a modulator than a mixer. Let's not get into an argument over
semantics but y'all know what I mean, I'm sure.

You could make your own, but an MCL TUF-1 or SBL-1 won't be all that
expensive. They do need a 7 dBm local oscillator drive level.


BTW, thanks for a good steer with the Pulsonix suggestion, Leon. I'm
making good progress getting to grips with it.

You could join the Pulsonix UG:

http://groups.yahoo.com/group/PulsonixUG/

Leon
--
Leon Heller, G1HSM
Email:
My low-cost Philips LPC210x ARM development system:
http://www.geocities.com/leon_heller/lpc2104.html

On Sat, 21 Feb 2004 12:28:13 +0000, Paul Burridge
wrote:


Anyone care to nominate an RF mixer chip for 100Mhz that's readily
available in the UK?

Since you don't specify anything important like IP3, my recommendation
is Siemens S042P. Earlier, when Motorola was easy to buy from, I would
have used MC1496P, but none of them have high IP3 and I suppose NE602
isn't any better. If balance isn't important, I would use BF905 or
BF199

73, LA8AK
http://home.online.no/~la8ak/
----
Jan-Martin, LA8AK, N-4623 Kristiansand
http://home.online.no/~la8ak/

On Sat, 21 Feb 2004 12:28:13 +0000, Paul Burridge
wrote:


Anyone care to nominate an RF mixer chip for 100Mhz that's readily
available in the UK?

Since you don't specify anything important like IP3, my recommendation
is Siemens S042P. Earlier, when Motorola was easy to buy from, I would
have used MC1496P, but none of them have high IP3 and I suppose NE602
isn't any better. If balance isn't important, I would use BF905 or
BF199

73, LA8AK
http://home.online.no/~la8ak/
----
Jan-Martin, LA8AK, N-4623 Kristiansand
http://home.online.no/~la8ak/

On Sun, 22 Feb 2004 06:41:10 +0000, Leon Heller
wrote:

You could make your own, but an MCL TUF-1 or SBL-1 won't be all that
expensive. They do need a 7 dBm local oscillator drive level.

Thanks. I'll check 'em out.

You could join the Pulsonix UG:

http://groups.yahoo.com/group/PulsonixUG/

Will do. There are a couple of minor queries that have arisen.
--

The BBC: Licensed at public expense to spread lies.

On Sun, 22 Feb 2004 06:41:10 +0000, Leon Heller
wrote:

You could make your own, but an MCL TUF-1 or SBL-1 won't be all that
expensive. They do need a 7 dBm local oscillator drive level.

Thanks. I'll check 'em out.

You could join the Pulsonix UG:

http://groups.yahoo.com/group/PulsonixUG/

Will do. There are a couple of minor queries that have arisen.
--

The BBC: Licensed at public expense to spread lies.

Do the dual gate mosfets outperform the NE602 with regards to IP3?

For some reason the NE602 refuses to oscillate with crystals but LC's are
OK.


Since you don't specify anything important like IP3, my recommendation
is Siemens S042P. Earlier, when Motorola was easy to buy from, I would
have used MC1496P, but none of them have high IP3 and I suppose NE602
isn't any better. If balance isn't important, I would use BF905 or
BF199

73, LA8AK
http://home.online.no/~la8ak/
----
Jan-Martin, LA8AK, N-4623 Kristiansand
http://home.online.no/~la8ak/

Do the dual gate mosfets outperform the NE602 with regards to IP3?

For some reason the NE602 refuses to oscillate with crystals but LC's are
OK.


Since you don't specify anything important like IP3, my recommendation
is Siemens S042P. Earlier, when Motorola was easy to buy from, I would
have used MC1496P, but none of them have high IP3 and I suppose NE602
isn't any better. If balance isn't important, I would use BF905 or
BF199

73, LA8AK
http://home.online.no/~la8ak/
----
Jan-Martin, LA8AK, N-4623 Kristiansand
http://home.online.no/~la8ak/

On Sun, 22 Feb 2004 18:09:03 -0000, SWbeginner
wrote:

Do the dual gate mosfets outperform the NE602 with regards to IP3?

For some reason the NE602 refuses to oscillate with crystals but LC's are
OK.


[snip]

The NE602 only supports Colpitts and Butler crystal oscillator
configurations. It is *not* an inverter-style oscillator.

See:

http://www.semiconductors.com/acroba...tes/AN1983.pdf

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.