[time-nuts] 3GHZ Extender for HP 53131A and 53132A
GandalfG8 at aol.com
GandalfG8 at aol.com
Tue Nov 19 23:38:27 UTC 2013
Hi Arnold,
I was just about to reply to your first message and ask at what frequency
you'd measured the sensitivity, but then found your follow up:-)
I was very happy with the first one so bought a second one for my other HP
counter and both seem to be very similar.
I've just checked the 53132A against two radio tests sets and with both I'm
seeing an indicated sensitivity of close to -50dBm at 1000MHz, but both
generators are at their limit there and neither have been recently calibrated
at those frequencies so I'm quite happy to concede a few dBm tolerance:-)
I'm not too concerned about ultimate sensitivity anyway but, as I
commented previously, with them just being very much plug 'n go there wasn't a lot
else left to measure:-)
Regards
Nigel
GM8PZR
In a message dated 19/11/2013 22:50:44 GMT Standard Time,
arnold.tibus at gmx.de writes:
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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