[JMS] 90711 VFO questions

[Robert A Sullivan]

George,

Here is my #330 which I removed from its sealed box; proof that the adapter was included.

https://isquare.com/millenvfo-new.htm
RAS Hardware Page
isquare.com

Although not shown the output connector was the 2-pin banana jack.

73, Bob
WØYVA
Personal site: isquare.com <http://isquare.com/>



> On Oct 28, 2024, at 9:35 PM, W1LSB - George via James_Millen_Society <james_millen_society at mailman.qth.net> wrote:
> 
> Hello all!
> 
> 
> 
> After a lengthy search, I finally acquired a 90711 VFO thanks to a tip from
> Bob - W9RAN, who knew that I was on the hunt for one  Since acquiring it, a
> few questions have come to mind that one of you may be able to answer.  
> 
> 
> 
> I've seen that two variants of the RF output connector have been noted on
> the serial number page of the JMS web site; one with a 2 pin banana jack,
> and one with a UHF connector, like mine has.  The serial number of my unit
> is 309, however, I found a photo of the VFO with a two pin banana jack for
> the RF output; it was serial number 287.   It sounds like they may have
> changed connectors somewhere between the two units.  
> 
> 
> 
> Another question is whether the high impedance plug-in adapter was standard
> or optional.  The manual seems to imply that it was standard, however I
> gather that not everyone has one with their VFO; I do not.  The adapter was
> used to provide a high impedance output versus the standard low impedance
> output.   Apparently, the plug-in adapter was made in both banana plug and
> UHF connector versions as well, again per info on the JMS serial number
> page.  
> 
> 
> 
> Just curious as to whether anyone know more about these differences, and
> whether the high impedance plug-in adapter actually provides a benefit.
> Interestingly, the VFO could be used a vintage QRP rig all by itself, given
> that manual claims the RF O/P is around 1.75W 
> 
> 
> 
> Once this VFO has been restored, I'm planning to use it with a 90801 exciter
> and 90831 modulator, and eventually a 90881 RF amplifier with a high level
> modulator. 
> 
> 
> 
> Thanks & 73,
> 
> George - W1LSB
> 
> 
> 
> 
> 
> 
> 
> 
> 
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