Re: Harmonic performance - SSB vs CW


Glenn
 

Overkill maybe, I have a 3 band version PCB of the G4TZR version used in Picastar, rated 100+ watts.   Made for a personal HF rig project where 3 bands is all i need although the board can be stacked for 6 bands.  Schematic is on G6ALU's web pages, but cut down for 3 bands.  Layout identical.

glenn vk3pe






On Tue, Aug 7, 2018 at 11:31 AM, Gordon Gibby wrote:
Sure seems like it would be fairly simple and inexpensive, to make a small additional board to which you would route the transmitter signal, and relay  control voltages, buffered if necessary —-as Nik is working on. 
 
With the relays at opposite ends, even in expensive one should work.  
 
Reuse  as many components as reasonable from the existing filters.   The inductors at least!
 
Fairly simple upgrade!  If someone builds it , I’ll buy several boards, if not, I’ll lay out my own! You guys are busy explaining exactly how it needs to be done!  And I mainly care for just a few bands 
 
Cheers
Gordon
 
 
 
 
 

 


 

On Aug 6, 2018, at 20:35, ajparent1/KB1GMX <kb1gmx@...> wrote:

Nick,

Best layout is similar,  Bus down one site to the NO contacts
and the wiper is the end of the filter and when in the off poistion the
wiper sits on the NC contacts to ground shorting the filter.  So a filter pick 
enables the relay and filter and no pick the filter is shorted.  Reduces
the effects of stray capacitance.

That and copper pour under everything and opposing side. lots of vias to 
tie them together especially along signal tracks.

Allison

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