[Boatanchors] Grounded Grid filament choke spec's

[Price Smith]

 Hi:
 A couple of months ago the group discussed using filament chokes in 
grounded grid amplifiers.  Someone mentioned that if you were planning to 
use the amp on 160m a larger filament choke was required.
 So what's up with that? What's the magic number of uh's needed to decouple 
a 160m driving signal?
 I measured a B&W FC 30 filament choke and it measured in the 7 - 10 uh 
range for each wire. Am I ok using the FC 30 as is on 160m?
 Tnx
 Greg
 WA7LYO
 Kinston NC

Greg,

Your existing choke will work fine.
Increase the bypass capacitance at the transformer end. Perhaps an 
additional
.02 disk cerm. on each leg and increase the coupling caps with additional 
.01 or ,02 disk.

You will be in good shape on all bands.

73
Price W0RI