[time-nuts] 2201A GPS

[Jim Lux]

On 4/11/11 5:58 AM, paul swed wrote:
> Wow thats a multiplier chain. The IF is reasonable and would easily be
> accomplished in 1 to 2 chips today. Though 2 would be good so you can add
> filtering and improve isolation.
That's not all that exotic.  In some systems, you don't want PLLs 
because they may not always lock (e.g. over wide temperature ranges, or 
where a part is particularly sensitive to radiation: hyperabrupt 
varactors, for instance).   A multiplier almost always works.  The trade 
is often that the multiplier chain might consume more power than a 
single PLL, although I've seen some remarkably low power multiplier 
chains, and at higher frequencies, the dividers in the PLL start to 
consume a lot of power.




> Thanks
>
> On Mon, Apr 11, 2011 at 3:47 AM, Paramithiotti, Luciano Paolo S<
> luciano.paramithiotti at hp.com>  wrote:
>
>>   more info for you:
>>
>> Input/output:
>> +15VDC
>> Diplexer for 10Mhz input for LO multiplier chain and 75.42 Mhz output to
>> receiver.
>>
>> The LO, 1500Mhz, is obtained from 10 Mhz standard coming from GPS receiver
>> as follow:
>> X3=30Mhz x5=150Mhz x5=750Mhz x2=1500Mhz.
>>
>> RF path 3 stage amplifier and filter for a total gain of 32dB (antenna is
>> passive right-hand circular polarization).
>> RF BW is 150Mhz
>> IF path 4 mmic stages and filter for a total gain of more/less 50dB.
>> IF BW is 20Mhz
>> This is a 1990 project.
>>
>> Luciano P. S. Paramithiotti
>>