[time-nuts] RF Prescaler for 53131A/53132A/53181A counters - update !

[Arnold Tibus]

Hi Samuel,

I was quite a while away from my home, do you have good news?

greetings

Arnold

Am 08.07.2010 18:12, schrieb Samuel DEMEULEMEESTER:
> Here is some update on my low-cost extension board for the Agilent/HP
> counters. 
> 
> Finally received all the components and assembled everything some days ago.
> Here is a picture : http://www.x86.fr/rfpsc/rf_psc_01.jpg.
> 
> Right now, the performance is really good up to 3.5 GHz :
> 
> 50 MHz : -7 dB
> 100 MHZ : -15 dB
> 250 MHz : -26 dB
> 500 MHz : -30 dB
> 1 GHZ : -32 dB
> 2 GHz : -32 dB
> 3 GHz : -30 dB
>  
> Unfortunately, I have an odd issue with upper frequencies. The input of the
> prescaler is self-oscillating at about 3.7 GHz, even without any component
> on the input stage. The first prototype built doesn't have this issue. My
> goal is to reach 5-6 GHz with a good sensibility. Right now, I'm only able
> to measure -2 dB at 5 GHz.
> 
> As soon as everything will work fine, I will put online an ordering process
> for bare PCB, kit and fully-assembled board. 
> 
> 
> ---------------------
> Samuel DEMEULEMEESTER
> Presse Non Stop - Canard PC
> http://www.canardpc.com
> Tel : +33.6.13.73.4003
> MSN : sam at x86.fr 
> 
> 
> 
> 
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