[Moon-net] W6PO 2m Amp I/P circuit help.

[Bob Sutton]

Hi Hugh,

I have EXACTLY what David has, except that the 3T
cathode inductor is stretched a bit longer.

Todays reflector exchanges prompted another thought
... the 6T input inductor did not need "tuning", but
the stretched length of the 3T cathode inductor was
quite critcal in getting a low SWR at "full drive".

For what it is worth, my input tuning cap is also
5-25pF and is set at about 1/3rd mesh.

Hope you get there soon!

Cheers,  Bob


--- David Anderson GM4JJJ <david at gm4jjj.co.uk> wrote:

> On 2 Jul 2007, at 17:23, Hugh Duff wrote:
> > I'm having an interesting problem with my newly
> built W6PO 2m
> > amplifier;
> 
> 
> Hugh,
> 
> In the KB7Q modified version of the W6PO amp I found
> that the
> following worked:
> 
>   L1=6T 10mmdia 16mm long (airspaced no core)
>   and L2=3T 15mm dia 16mm long.
> 
> It improves VSWR= 1.2:1
> 
> L1 is input coil and L2 the coil to the cathode.
> 
> Make sure your capacitor rotor is grounded OK
> 
> Hope that helps.
> 
> 73
>
________________________________________________________________________
> 
> ___
> David Anderson, GM4JJJ         E-mail:
> david at gm4jjj.co.uk
>
________________________________________________________________________
> 
> ___
> Rotator Sales: http://www.braeside.plus.com
> MoonSked software: Tracking, Prediction, Scheduling
> and much more.
> Available for Linux, Windows or Macintosh. Also
> PalmTrack for Palm OS.
> http://www.gm4jjj.co.uk/MoonSked/moonsked.htm
> iDXSpot: Macintosh & Linux DX-Cluster Telnet access
> made easy!
> Mac HP GPS Control: HP Z3801A Time & Frequency
> Standard software
> 
> 
> 
> _______________________________________________
> Moon-Net posting and subscription instructions are
> at http://www.nlsa.com/nets/moon-net-help.html
> 
> 


zl1rs at yahoo.com


      ___________________________________________________________ 
Yahoo! Mail is the world's favourite email. Don't settle for less, sign up for
your free account today http://uk.rd.yahoo.com/evt=44106/*http://uk.docs.yahoo.com/mail/winter07.html