The spur for 30mhz is at 45-30 = 15mhz.
So you want either a high pass or a band pass filter.
Allison is recommending a bandpass filter.
Here's a starting point, using T50-10 toroids for the transformers,
you can probably wind the 0.59uH inductor on?a T50-10 also.
The kit is no longer availalable, but Diz will sell you the toroids and wire and caps,?
maybe give some advice too.
There may be other such kits out there, but still in production.
Solder it up on a scrap of PC board, install it in line with the antenna coax,
adjust the caps or maximum power into a dummy load.
That's a sharp filter, only a few hundred khz wide on 30m, so tune
it up for the part of the band you are interested in.
I haven't done this, I may have gotten something wrong here.
On 15 meters (21mhz), the spur is at 45-21 = 24mhz.
That's close in, needs a fairly tight bandpass (or lowpass, in this case)? filter to take that out.
?
Jerry
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On Fri, Jun 8, 2018 at 12:29 pm, <davedt1e@...> wrote:
I do have a multi z tuner kit on the way.? So can the high pass filter for 10 meters be a simple RC or LC for 27 mhz and below. Then placed in the antenna feedline?? Maybe with a toggle switch for bypass? Or am I over simplifying?
