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Old 23rd Apr 2021, 9:07 pm   #15
kalee20
Dekatron
 
Join Date: Feb 2007
Location: Lynton, N. Devon, UK.
Posts: 5,747
Default Re: Where is the RF amplifier?

It's quite true that LW front-ends could cause sideband cutting, I'm right now building a superhet and calculated that I'd want a Q of not much more than 20 on LW.

Having wound myself a nice ferrite rod aerial with 30 strand 0.063mm wire, 3 pies, with a Q of nearly 300, I'm realising I'm going to have to add parallel damping resistors to kill it! At least it's under my control... With an extra gang that I haven't got, I could've made a bandpass front-end and probably got MORE signal into the frequency changer!
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