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

Wed Apr 14 23:05:03 EDT 2010

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

----- Original Message ----- 
From: "Carl" <km1h at jeremy.mv.com>
To: "Barrie Smith" <barrie at centric.net>; <boatanchors at mailman.qth.net>
Sent: Wednesday, April 14, 2010 8:16 PM
Subject: Re: [Boatanchors] [Swan] SWAN 250C six meter rig question

> Just be thankful that Eico didnt produce a 6M version of the 753!
>
> At least the later Too Drifty production runs were a little bit better. I
> still hear a few on the band.
>
> Carl
> KM1H
>
>
> ----- Original Message ----- 
> From: "Barrie Smith" <barrie at centric.net>
> To: <boatanchors at mailman.qth.net>
> Sent: Wednesday, April 14, 2010 8:45 PM
> Subject: Re: [Boatanchors] [Swan] SWAN 250C six meter rig question
>
>
>>
>> Carl:
>>
>> I used a Swan 250 for a number of years.  That was not "Drift", is was an
>> early, and commendable, attempt at band scanning.
>>
>> 73, Barrie, W7ALW
>>
>>> It also had the well deserved nickname Swan Too Drifty.
>>>
>>> Carl
>>> KM1H
>>>
>>>
>>> ----- Original Message ----- 
>>> From: <N4ch at aol.com>
>>> To: <swan at mailman.qth.net>; <boatanchors at mailman.qth.net>
>>> Sent: Wednesday, April 14, 2010 6:55 PM
>>> Subject: Re: [Boatanchors] [Swan] SWAN 250C six meter rig question
>>>
>>>
>>>> Hello All,
>>>>
>>>> Regarding the query about the Swan 250's VFO  frequency:   The
>>>> "original"
>>>> Swan 250 had an IF at 10.7 MHz, and  was single conversion.   The
>>>> injection
>>>> was low side, meaning  that for 50.0 MHz operation, the VFO injection
>>>> was
>>>> at
>>>> 39.3 MHz.    The VFO itself ran at one third of this frequency
>>>> (subsequent
>>>> tuned circuitry  picked off the third harmonic of the VFO itself),
>>>> meaning
>>>> that at a transceive  frequency of 50.0 MHz, the VFO itself was running
>>>> on
>>>> 13.1 MHz.    There's some info on all this in a product review of the
>>>> Swan
>>>> 250
>>>> in the July,  1967 issue of CQ Magazine.   There's also a similar
>>>> write-up
>>>> of the  subsequent 250-C in another CQ review; see the August, 1969
>>>> issue
>>>> for
>>>> that.   Also note that in the later 250-C there was another important
>>>> change (besides the obvious receiver front-end changes, mechanical dial
>>>> "bandset" for the VFO, addition of the meter's receiver "S" meter
>>>> function,
>>>> etc.).........the 250-C's IF got moved to 10.9 MHz instead of the
>>>> original
>>>> 10.7.
>>>>  This means that in the 250-C, the VFO injection is 200 KHz  lower than
>>>> it
>>>> was in the 250 (at Fo = 50.0 MHz, the injection is at 39.1 MHz,  which
>>>> means that the VFO itself is running at 13.033333 MHz now).    ALL the
>>>> Swan
>>>> tube-type rigs (350, 500, 700, the 250 series, all the  "Cygnets", 
>>>> etc.)
>>>> remained single-conversion; the VFO injection was always either  above
>>>> or
>>>> below the
>>>> IF, with the difference always being the IF frequency  itself.
>>>>
>>>> 73, Herman, N4CH.
>>>>
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>>>>
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>>>
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>>>
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>>
>>
>>
>> ______________________________________________________________
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>>
>> List Administrator: Duane Fischer, W8DBF
>> ** For Assistance: dfischer at usol.com **
>>
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
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>
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
>
>
> This list hosted by: http://www.qsl.net
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