[time-nuts] HP10514B Mixer Terminations

[Dr. David Kirkby]

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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>>>
>>>
>>
>>
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>
>
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-- 
Dr. David Kirkby Ph.D C.Eng MIET