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

[Carl]

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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