On 09/ 9/12 09:03 PM, Bruce Griffiths wrote:
For this particular application a capacitive termination (NIST used such
a termination in their DMTDs) of the IF port followed by a low pass
filter is advantageous.
For precision work screw connectors (SMA, TNC, N etc) are more stable
than bayonet connectors like the BNC.
Bruce
I'd agree with Bruce there. I'd chose SMA or N any day over BNC.
My favorite connector is APC-7, but you don't see that except on high-end test
equipment, and even there it is being phased out in preference to 3.5 mm, which
will mate with SMA - although care is needed if mating 3.5 mm to SMA.
The only issue with SMA is that you ideally need a torque wrench to tighten them
properly. If you don't have one, hand-tight plus 25% of a turn will get you
somewhere around the right torque, but I always use a torque wrench myself for
permanent connections or temporary ones at microwave frequencies.
Dave
J. Forster wrote:
Most all of this kinda stuff is built using 50 Ohm 'building blocks'. You
can almost plug them together like Legos.
The HP 10514A is no different:
http://www.ko4bb.com/Manuals/HP_Agilent/HP_10514_Mixer_Jan_1967.pdf
Mini-Circuits (among others) sells loads of different wsuch components.
Your biggest choice may be the connector style. BNC and SMA are very
common. If size/weight are not a consideration go BNC.
-John
===========
Hello Brian,
I am a radio amateur and and also in the Time nuts list, At
the moment I am planning to bild a DMTD for experimentation.
and as you have a nice experience in this field , for me will
be very wellcame your help. My ask is ¿whitch is te best
temination for the mixer? (FI 10Hz or 100Hz) ¿what about the
amp, limiters and zero crosing detec.)
All your help will be appreciated
Thanks in advance
Pascual Arbona EA5JF
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--
Dr. David Kirkby Ph.D C.Eng MIET
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