[time-nuts] GPS down converter question

[paul swed]

Magnus you are right.
Its interesting in that several parts are easily available at
semi-reasonable cost.
Mini- circuits has a all in one synthesizer module dsn-2036 for the LO and
they also have very nice IF filters. The BPF-a76 appears to be exactly the
right bandwidth for a GPS IF.
There are some things to work through but they seem reasonable.
Regards
Paul.
WB8TSL

On Mon, Nov 30, 2015 at 5:02 PM, Magnus Danielson <
magnus at rubidium.dyndns.org> wrote:

> Paul,
>
> Many GPS receivers only use 2,046 MHz bandwidth, but some use the full
> 20,46 MHz even if they only do C/A. Guessing that you are working on
> down-conversion for an old box, then 2,046 MHz will be your answer.
>
> Cheers,
> Magnus
>
>
> On 11/30/2015 06:37 PM, paul swed wrote:
>
>> I am looking at building a GPS down converter.
>> LO 1500 Mhz locked to a 10 MHz ref.
>> The IF will be at 75.42 Mhz how wide should it be?
>>
>> My question is simple.
>>
>> What should the IF pass band bandwidth be?
>> Not sure if it should be 3-4 Mhz, 10 or 15 wide.
>>
>> Thanks
>> Paul
>> WB8TSL
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