[time-nuts] 3GHZ Extender for HP 53131A and 53132A

[XPMUser]

To be correct,
I was a bit fast with my statement before
and I have to add, that the sensitivity in
fact is higher at the lower frequencies:

@ 50 MHz --> -31 dBm
@ 100 MHz --> -40 dBm
@ 200 MHz --> -50 dBm
@ 250 MHz --> -50 dBm
@ 500 MHz --> -50 dBm
@ 1000 MHz --> -44 dBm
@ 2000 MHz --> -37 dBm
@ 2500 MHz --> -28 dBm

This is perhaps now more helpful for the experts,

sorry Nigel and Rick for my previous misleading info,

regards
Arnold


Am 19.11.2013 21:19, schrieb XPMUser:
> Hello Nigel,
> and hello Rick,
> 
> thank you for the hint to and the remarks concerning
> the 3 GHz extender from SQ5ESM.
> 
> I ordered one unit and got it within a few days last week.
> I am very happy with it in my 53132A, looks like the original
> from HP in detail. Also the manufacturing quality seem to
> be of high grade, worth the money.
> 
> I checked the sensitivity using my 8663A up to 2.5 GHz(and
> Trimble Thunderbolt for the reference frequency). The service
> manual says that the reading shall be stable up to -27 dBm.
> My unit is stable up to -28 dBm to -29 dBm, -30 dBm is too
> low. So the unit does work very fine and behaves as decribed
> by HP, does seem to be a realy good work using quality parts
> as stated by the seller.
> I have no idea why yours is showing different values. Did you
> check it again?
> I hope the original design by HP does meet the criteria
> mentioned by Rick ;-)
> 
> Thanks again for all the very interesting comments,
> 
> regards,
> 
> Arnold
> 
> 
> 
> Am 09.11.2013 01:03, schrieb Richard Karlquist:
>> On 2013-11-08 15:49, GandalfG8 at aol.com wrote:
>>
>>>
>>> At 1000 MHz, the highest frequency I can generate right now, I've 
>>> measured
>>> the channel 3 input sensitivity as -50dBm with a sinusoidal  signal.
>>>
>>> Regards
>>>
>>> Nigel
>>> GM8PZR
>>>
>>
>> This high sensitivity is probably a bad thing, not a good thing.
>> It is indicative of a dynamic divider.  For a frequency counter
>> prescaler, you want a static divider, such as the HP5386 used.
>> Dynamic dividers make errors if the signal being measured
>> has a broadband noise floor or sufficiently high spurs at any
>> frequency.
>>
>> Rick Karlquist N6RK
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