[JMS] 90711 VFO questions

[Dennis Petrich]

Hello George, I have one of those units and can respond to your questions but I would rather do it on the phone. Send me an email to K0eoo at arrl.net and I’ll give you my phone number.

Dennis, kOeoo
Sent from my iPhone

> On Oct 29, 2024, at 8:01 AM, Robert A Sullivan <RAS at isquare.com> wrote:
> 
> 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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