Hello, Tomm -- L/R parasitic suppressor networks typically have roughly
the same reactive ohms at the anode's self-resonance as their resistive
ohms. For example, a pair of 3-500Zs typically have an anode
resonance of c. 120MHz. Thus, for a 100-ohm suppressor R, 140nH
(XL=100-ohms) would be roughly optimal. For use with a 50-ohm
suppressor R, L-sup would be c. 70nH.
- note - In the above example, the 100-ohm suppressor would give more
VHF suppression, but it would run much hotter at 29MHz. Parasitic
suppressor design is basically a balancing act between adequate
reduction of VHF gain and a meltdown at 29MHz.
- cheers
On Mar 20, 2005, at 6:46 PM, Tomm Aldridge wrote:
> All,
>
> As part of my amp project I just received some Dale 1 Ohm, 25W ww
> resistors. I was holding one in my hand admiring its chunkiness (yes,
> I
> am that strange)when I saw it was wound with 5T of flat strip. This
> made me wonder if it was a nice lossy inductor, It is, the inductance
> is .43uH as measured on my AADE L/C Meter IIB. Could this be a ready
> made parasitic choke? What do you think?
>
> Dale HL 0250Z1R000JJ is the P/N
>
> Cheers,
>
> Tomm, KD7QAE
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|