[TowerTalk] Triplexor/Switch/BPF SO2R

[George Skoubis]

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 at hotmail.com> wrote:
> 
> 4O3A
> 
> https://4o3a.com
> <http://foro.ea1ddo.es/>
> 
> 
> ________________________________
> De: TowerTalk <towertalk-bounces at contesting.com> en nombre de john nistico <electric911inc at hotmail.com>
> Enviado: miércoles, 16 de febrero de 2022 12:36
> Para: Richard Cariello <rcariello49 at gmail.com>; ed_richardson at shaw.ca <ed_richardson at shaw.ca>
> Cc: TowerTalk at contesting.com <TowerTalk at 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 at contesting.com> on behalf of Richard Cariello <rcariello49 at gmail.com>
> Sent: Wednesday, February 16, 2022 7:29:14 AM
> To: ed_richardson at shaw.ca <ed_richardson at shaw.ca>
> Cc: TowerTalk at contesting.com <TowerTalk at 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 at 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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