Topband: RX antenna switching - multi-rig, multi antenna

[Jeff AC0C]

Thank you Frank.  1000' - wow.

What is the topology of the fanout (single antenna to 6 op positions); do 
you hang a MC splitter or similar off the back of the K8ZOA preamps?

I have looked at the K9AY So2r switch (forget what it's called - it has 2 
keypads) but wonder what is inside the box.  That had 8x2.  Is that what you 
are using there (6 sets of the 8x2 switch?) - or did he cook you up 
something custom?

73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie

-----Original Message----- 
From: donovanf at starpower.net
Sent: Tuesday, April 21, 2015 12:13 AM
To: 160
Subject: Re: Topband: RX antenna switching - multi-rig, multi antenna

Hi Jeff,


Here's how we handle receive antenna switching at W3LPL:


Six monoband receiving arrays are located 1000 feet southeast of the
transmit antennas. Each monoband receive array feeds a W3LPL
bandpass filter and a Clifton Labs Norton Preamplifier in the shack
except for 10 meters which uses a Clifton Labs Norton preamp at the
center of the 10 meter 4-square array.


160M 8-circle using W8JI 25 foot umbrella verticals
80M 8-circle using W8JI 25 foot umbrella verticals
40M 8-circle using W8JI 14 foot umbrella verticals
20M 4-square using 16 foot verticals
15M 4-square using 11 foot verticals
10M 4-square using 8 foot verticals


Three 580 foot Beverages (NE, S, W) are located 1000 feet from the
transmit antennas. Each Beverage feeds 160, 80 and 40 meter W3LPL
bandpass filters which then feeds three ARR preamps in the shack.

Two transceivers are used on each band, mostly Elecraft K-3s and Yaesu
FTdx5000s. K9AY receive antenna switches are used with the 160, 80
and 40 meter transceivers to allow all six operators to select one or more
receive antennas completely independent of all other operators. The
transmit antennas also feed the inputs to the K9AY switches. The only
restriction is that the monoband vertical receiving arrays can point in only
a single direction on each band, but the Beverages provide the capability
for the two operators on each band to receive in different directions.


73
Frank
W3LPL


----- Original Message -----

From: "Jeff AC0C" <keepwalking188 at ac0c.com>
To: "Tom W8JI" <w8ji at w8ji.com>, "Art Snapper" <art at nk8x.net>
Cc: "160" <topband at contesting.com>
Sent: Tuesday, April 21, 2015 3:58:45 AM
Subject: Topband: RX antenna switching - multi-rig, multi antenna

Art,s question has got me thinking about how the big multi-multi handle a
bunch of receiving antennas routed to a bunch of stations?

Here I'm looking at up to 8 rx antennas fed to 4 stations. But the more you
dig into this, the more complicated it can get. A crossbar-sort of
switching arrangement would do the signal routing - but it would not provide
any rig to rig isolation and would not maintain a constant Z (important if
the rx amp is a norton type).

73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie


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