[Boatanchors] Drake 2-NT & Knight V-44 VFO

[Robert Spooner]

Bill,

If you have a back wave, your VFO is not being turned off, so check the contacts on the relay that are supposed to do that.

73,
Bob AD3K

> On Jul 26, 2016, at 8:09 AM, Bill Stewart <cwopr at embarqmail.com> wrote:
> 
> Rob, 
> In my case the vfo is switched on and off thru it's key
> line by a relay in the 2-NT. Grid block keying is used
> to turn the driver on and off with keying. The applied
> cut-off voltage should be around -125vdc. I'm in the
> process of making some voltage checks so maybe that will
> show up something.
> Tnx...73 de Bill K4JYS
> 
> ----- Original Message -----
> From: "Rob Atkinson" <ranchorobbo at gmail.com>
> To: "Bill Stewart" <cwopr at embarqmail.com>
> Cc: "boatanchors" <boatanchors at mailman.qth.net>
> Sent: Monday, July 25, 2016 9:16:35 PM
> Subject: Re: [Boatanchors] Drake 2-NT & Knight V-44 VFO
> 
> Bill, I've had backwave years ago but I don't remember what I did
> about it.  I think it is not difficult to remedy but I'd have to
> consult a handbook.  You must have the driver free running and are
> only keying the final?  Maybe the VFO or some intermediate stage is
> driving harder than it needs to be?  If it can be heard by skywave it
> is too strong alright.
> 
> Rob
> K5UJ
> 
> On Mon, Jul 25, 2016 at 12:30 PM, Bill Stewart <cwopr at embarqmail.com> wrote:
>> Rob, I got two 'swl' reports of the backwave....hi.
>> The bw sig was abt s4, cw sig s9. I would say that on all
>> my BA stns the 'vfo sig' is much weaker than the actual
>> cw signal so I use the local signal for cw monitoring.
>> But in this case, the backwave is so strong, I can't
>> hardly 'monitor' my cw. I'm gonna go back thru the 2-NT
>> driver alignment and do it per the book rather than
>> just peak the driver coils for max output into the
>> dummy load. Don't see why that would make any diff.
>> Oh, the vfo feeds into the osc (6EA8), driver is a
>> 12BY7, final a 6HF5.
>> Tnx...73 de Bill K4JYS
>> 
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