[hpsdr] Munin2 Update

Berndt Josef Wulf wulf at ping.net.au
Sun Mar 9 19:16:31 PDT 2014


G'day Rod,

I've now included the circuit diagram showing the modifications. Its
basically the same as Kjells original circuit except I'm using two NTC
thermistors, one mounted onto the casing of each final transistor.

73, Berndt
VK5ABN

> On Sun, 2014-03-09 at 18:00 -0700, Rod Brink wrote:
> > Hi Berndt -
> > 
> > I've noted the same un-compensated bias drift characteristic on my Munin and 
> > have been a bit worried about it, notwithstanding the comment from K2UE. 
> > I'm puzzled by your assertion that the compensation you achieved was not 
> > good enough - it looks damn good to me.  Kjell has come up with two 
> > different compensation circuits and each has employed a single NTC resistor. 
> > You have used two and it appears you are also using a pot.  Can you publish 
> > your latest circuit, please - I'd like to try it.
> > 
> > 73 de Rod KQ6F
> 



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