[Boatanchors] [Swan] SWAN 250C six meter rig question

[Singley, Rodger]

Sandy,

My Swan 250 drift does settle down after 45 minutes but I have a feeling that each unit has a different drift characteristic.  What I really "like" is I have the original model 250 without the built in calibrator and selling a rig with a coarse/fine VFO setup like the 250 without the calibrator is crazy.  My Swan 600 twins use the same coarse/fine set VFO arrangement but at least the 600R receiver has a calibrator built in.

For the original poster, I assume the VFO in the C version is nearly the same as the original.  In the 250 the VFO oscillates on 12,934-14,434 Mhz. to cover 49.5-54 Mhz. respectively.  The oscillator output is tripled in the VFO amplifier to 38,802-43,302 Mhz. to provide the actual mixer injection frequency and I this fairly high VFO frequency then tripled does nothing for the drift.  

Rodger WQ9E


-----Original Message-----
From: boatanchors-bounces at mailman.qth.net on behalf of Sandy
Sent: Wed 4/14/2010 10:05 PM
To: Carl; Barrie Smith; boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] [Swan] SWAN 250C six meter rig question
 
At one time in different phases of my amateur adventures, I built an EICO 
753 (Seven drifty three)  It was n't a bad rig except for the damned drift. 
Much later, I aquired a Swan 250.  It had "good ears, but it NEVER STOPPED 
drifting!  AWFUL thing.  How do you operate with a rig like that?  If you 
left the room for a moment, the station had drifted away before you came 
back for sure!  I vote the 250 the worst drifter I have EVER used!  Needless 
to say, I sold the damned thing.

73,

Sandy W5TVW