[CQ-Contest] Antenna Switching

[Pavel Perchine]

HI,

There is a solution to make an antenna switch life easier if any signal
leakage between bands inside the switch is found.
Of course, you can buy a new switch with better port isolations but you can
install HP BPF on a "bad" band before the antenna switch also.
Before the antenna switch means that you should filter harmonics after the
amplifier by installing BPF before signal enter the antenna switch. It
helps.
Jim, I do not believe that there is any antenna switch on this planet which
can provide -100dB isolation on 28MHz, even 75-80dB range is an excellent
achievement...and the number depends on how it is measured.

Pavel
VA6AM

On Tue, Sep 19, 2023 at 11:36 AM Lee Hiers <lee.hiers at gmail.com> wrote:

> I'm sure the 4O3A products are excellent...
>
> But budget is a consideration, and I already own the SixPak.  Further, I
> will be operating at the 100W level when SO2R.  In years past, the
> isolation between bands wasn't a problem for the SixPak at my station at
> 100W - I didn't even need a bandpass filter, although I did use them at
> first.  I may ultimately end up with a better switch, but for now, my main
> interest is in automating antenna selection and providing for an auxiliary
> antenna.
>
> 73 de Lee, AA4GA
>
>
> On Tue, Sep 19, 2023 at 9:42 AM Jim Brown <k9yc at audiosystemsgroup.com>
> wrote:
>
> > On 9/18/2023 8:23 AM, Lee Hiers wrote:
> > > I've got an old Array Solutions SixPak antenna switch.
> >
> > This is a bottom of the barrel product, isolation in the range of 50 dB
> > and the relays aren't great. 4O3A 6x2 is much better, 75 dB, and his 8x2
> > better yet, >100 dB. 4O3A is great to deal with.
> >
> > 73, Jim K9YC
> >
> >
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