I will vouch for the VA6AM Triplexers and HP BPF
His website has examples of configurations also.
I emailed him my idea and he was quick to reply with suggestions.
I use a DXE 8 x 2 switch to switch between rigs and antennas.
There were a few frequencies I had to avoid on the band scope during the RTTY
contest last weekend but nothing major (HP).
73,
George / W7GES
> On Feb 16, 2022, at 5:38 AM, Máximo EA1DDO_HK1H <ea1ddo@hotmail.com> wrote:
>
> 4O3A
>
> https://4o3a.com
> <http://foro.ea1ddo.es/>
>
>
> ________________________________
> De: TowerTalk <towertalk-bounces@contesting.com> en nombre de john nistico
> <electric911inc@hotmail.com>
> Enviado: miércoles, 16 de febrero de 2022 12:36
> Para: Richard Cariello <rcariello49@gmail.com>; ed_richardson@shaw.ca
> <ed_richardson@shaw.ca>
> Cc: TowerTalk@contesting.com <TowerTalk@contesting.com>
> Asunto: Re: [TowerTalk] Triplexor/Switch/BPF SO2R
>
> 4i3a makes great products. I use his bandpass filters and antenna switch for
> remote operation.
> NY6DX
>
> Get Outlook for iOS<https://aka.ms/o0ukef>
> ________________________________
> From: TowerTalk <towertalk-bounces@contesting.com> on behalf of Richard
> Cariello <rcariello49@gmail.com>
> Sent: Wednesday, February 16, 2022 7:29:14 AM
> To: ed_richardson@shaw.ca <ed_richardson@shaw.ca>
> Cc: TowerTalk@contesting.com <TowerTalk@contesting.com>
> Subject: Re: [TowerTalk] Triplexor/Switch/BPF SO2R
>
> Ed,
> Check out the VA6AM product line.
> Rich AA2MF
>
> Sent from my iPad
>
>> On Feb 15, 2022, at 2:58 PM, ed_richardson@shaw.ca wrote:
>>
>> Regrettably I am resigned to never having stacked monobanders on this
>> suburban lot. I have now started investigating the idea of using a
>> triplexor and associated bandpass filters as a way of getting an SO2R
>> antenna system operational utilizing the same 5 band yagi. Currently I am
>> using a ground mounted vertical (during the winter only) as the second
>> antenna.
>>
>>
>>
>> The common application recommendations are to use one of the 2x6 or 2x8
>> switches to direct the 20/15/10m signals from either transceiver through the
>> matching BPF and into one input of the triplexor. I am seeing band to band
>> isolation figures of the filter/triplexor combos in the 85-100 dB
>> Unfortunately the 2xn switches appear to have radio A to radio B isolation
>> values in the 70 dB range.
>>
>>
>>
>> Would this multiport switch isolation not be the limiting factor? Two 1 kw
>> transmitters will still place -10 dBm signals at the input of the other
>> radio.
>>
>> How critical is it that the unselected bands be terminated in 50 ohm? I see
>> that many of the 2xn switches ground the unselected ports and this would
>> effectively put a short on the unused BPS filter input.
>>
>>
>>
>> Would a second set of low power BPFs installed between the radio and power
>> amplifier be effective in removing another 30-40 dB of offending signals.
>> This comes at the expense of another dB or so of insertion loss.
>>
>>
>>
>> Does anyone have any real-world practical experience using two - 1kw radios
>> triplexor/filter/switches.
>>
>> Lessons learned are much appreciated.
>>
>>
>>
>> Ed VE4VT
>>
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
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>> TowerTalk@contesting.com
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