[CQ-Contest] Bandpass Filters (Was: Re: 419 bandpassfilters..

[Jukka Klemola]

...
>Not much drama in there as one would expect from W3NQN DIRECTLY coupled
>fiters with additional tapped parallel L/C stubs.  Dunestar is
top-coupled >in optimal configuration for 50 Ohms.  ICE the elegant
simplicity with >21/28 MHz problems.
>
>My measuring instruments are better than your$ :-)
>
>73 de Mario, S56A, N1YU

Why would ICE 21/28MHz performance be a problem?
I know Dunestars fry due to losses and ICEs can fry at least on 40.
I have not yet lost a single ICE. One ICE was lost during OI2HQ
operation.

But why would 21/28 or 28/21 performace be a problem?

I have no problems at OH4A.
I use multiple yagis on both my towers on 21 and 28MHz.
I use also amps. AL1200 and so.
I have no adjacent band problems 21/28.

7MHz harmonic is S9 + 20 on 14, but I can tune a few kHz off the exact
harmonic and work also weak stations.

No problems 28/21 nor 21/28.


73,
Jukka OH6LI