To: | <amps@contesting.com> |
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Subject: | [AMPS] parasitics |
From: | m.j.willis@rl.ac.uk (Mike Willis) |
Date: | Wed, 22 Apr 1998 08:05:08 +0100 |
>Is there a case for adding a shunt suppressor load to cope with when >there is a high Z anode load at vhf - a state where the voltage gain >will be highest? Mental arithmetic makes me think it would have to be a >C/L/C high pass filter so as not to cook things on 10m. > >Steve > Almost certainly, but it is difficult owing to the EHT. If you design the PI-L circuit correctly, it will act like a low pass filter so ought to never be high Z at VHF. This does mean you have to use VHF techniques even though the amplifier is at HF. Short ground paths, thick conductors and multiple capacitors (i.e. 1 good low value VHF type in parallel with the HF one) for the DC block would be a good idea. It is better to use an HF transistor that has a gain drop off than a VHF one in an SSPA, so I would expect the same to be true of valves. E.g. a 3-500Z amp would be easier to tame than (say) a 3CX800. -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Search: http://www.contesting.com/km9p/search.htm |
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