[hpsdr] GIBRALTAR LO generation question

[Alex]

Lyle,
There are three devices on CASMIR that require a LO

the Analog Devices AD8345 Modulator uses a LO from 140MHz to 1000MHz
the Analog Devices AD8349 Modulator uses a LO from 700MHz to 2700MHz
and the Pericom PI5V331 has the same basic requirements as the SDR-1000 except the need to support the 70MHz band.

Granted that the entire LO range is not needed for the two Modulators.

I can put in a LO circuit that will take advantage of the 10MHz differential reference signal that is to be available on ATLAS, but I know there was a significant level of discussion going on regarding availability of a centrally-generated uWave LO to be distributed off ATLAS.

I'm just trying to get CASMIR out the door while I have some time available.

Alex, N3NP 

----- Original Message ----
From: Lyle Johnson <kk7p at wavecable.com>
To: Alex <harvilchuck at yahoo.com>
Cc: hpsdr at hpsdr.org; Rick Hambly (W2GPS) <w2gps at cnssys.com>; Robert McGwier <rwmcgwier at comcast.net>
Sent: Thursday, July 6, 2006 8:39:59 PM
Subject: Re: [hpsdr] GIBRALTAR LO generation question

Hello Alex!

> Umm, so where does the LO come from for CASMIR and HORTON?
> I thought we were going to do the centralized uWave LO in order to support N4HY's phasing request?

One of many ideas being bandied about.

Gibraltar is a frequency and timing reference as I understand it, 
nothing more.

I suspect Horton may need its own, localized LO.  Or perhaps the LO is a 
separate module, or ???

I am not sure what is required for CASMIR.  I haven't had the time to 
dig into the Analog Devices data sheets on the chips you are proposing 
to see what their requirements are.

73,

Lyle KK7P





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