Message-ID: <5.1.0.14.2.20020814195022.009fa1c0@mail.pncl.co.uk>
Date: Wed, 14 Aug 2002 20:06:03 +0100
To: rsgb_lf_group@blacksheep.org
From: "Walter Blanchard" <blanch@pncl.co.uk>
Subject: LF: FT-817 Osc Stability
MIME-Version: 1.0
Content-Type: multipart/mixed;
 boundary="------------080206060103030102040705"
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org
Sender: <majordom@post.thorcom.com>

This is a multi-part message in MIME format.
--------------080206060103030102040705
Content-Type: text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding: 8bit

At the Crawley LF roundtable a few weeks ago somebody asked me if I'd 
measured the stability of an FT-817, but I hadn't.
Now I have. After running it for 24 hrs I set it to track a harmonic of my 
5 MHz Rb standard at 145 MHz.  Over the
following 24 hrs it very slowly drifted about as the shack temperature 
changed but never exceeded 20 Hz deviation.
This on its standard osc, NOT the hi-stab TCXO option. This is quite 
remarkably good - far better than my Icom 706
which has ICOM's "hi-stab" option and constantly jitters 30-50 Hz at the 
same freq. mainly due to its internal fan.
It's not far off my IC-821 which also has the hi-stab option.
I've written to ICOM recommending they should provide a facility in all 
their top-end stuff for inputting a sub-standard
5 or 10 MHz as frequency reference. No reply yet!

Incidentally I think the idea of buying a cheap synthesized HF sig gen as 
the basis of an LF rig an excellent one. Nobody wants
sig gens that don't go to 1 GHz these days so they're quite cheap and if 
they have a first-order OCXO as reference they'll
do very nicely.  Stewarts of Reading have a vast selection and are very 
helpful.

Walter G3JKV.


--------------080206060103030102040705
Content-Type: text/plain; charset=windows-1252;
 name="ATT09914.txt"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
 filename="ATT09914.txt"


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.381 / Virus Database: 214 - Release Date: 02/08/02

--------------080206060103030102040705--