I think their new 8 pack also ground the unused antennas. I am
considering this but still waiting for the software to be finished.
On 3/2/2010 7:16 PM, Jim Thomson wrote:
> Date: Tue, 2 Mar 2010 12:08:54 -0600
> From: Stan Stockton<firstname.lastname@example.org>
> Subject: Re: [TowerTalk] Budget 4-Pack?
> Two DPDT relays for each antenna - one for each rig. Activating a
> relay by Rig A with one set of contacts disables the other rig from
> being able to activate the same relay for the same antenna and vica
> versa. If you are also wanting to prevent the other rig from
> transmitting at all that is another box to build. Let me know if this
> is enough info. If not I'll draw it.
> Stan, K5GO
> ### That's not how my six-pack works. The 6 x pack uses 3PDT
> relays. 12 x relays in all, 6 x for radio..'A'.... and 6 x for..radio..'B'
> ## for a 4-pack, and 2 x radio's... a total of 8 x 3PDT relays required.
> The 1st pole of each relay simply OPENS OFF the coil of it's mating
> relay. [ and vice versa]. IE: radio 'A' can grab any 1 of the 4 x ants'.
> Radio 'B' can grab any of the 3 remaining available ants. IF radio
> 'B' is set to the same ant as radio 'A'....[say ant 1] , then radio 'B'
> relay #1' will not operate !
> ## It's a real simple mech interlock arrangement really. It also provides
> aprx 70-80db isolation between radio A + B 's main 2 x coax inputs,
> and 60 db between either radio and any ant port [ this one is real important].
> ### http://www.arraysolutions.com/Products/sixpak.htm
> then click on.. 'users guide' Then scroll way down the user's guide,
> and u will see the complete schematic ! Notice that the 1st pole of
> each relay only uses 2 x contacts [the common and normally closed].
> The normally open contact is not used.. or depicted on schematic[pole1].
> These NC contacts are wired to each other's coils.[interlock].
> The remaining 2 x pole's of each relay are used to do the switching,, and
> provide HIGH isolation [when de-energized] The 2 remaining poles have
> their RF contacts wired in SERIES !
> ## The high isolation comes about by using the 2 x sets of
> contacts in series. When de-energized, the leakage path is
> Doubled. You have the stray C of each open contact, now in
> series with each other = 1/2 the stray C = higher isolation compared
> to, if just one set of contacts used. Hence the use of 3PDT relay's
> and NOT DPDT relays. The 3PDT relays used in the 6 x pack use
> gold plated contacts. It will handle 5 kw cxr, no problem.
> ## The relays are mounted [soldered] onto PC board, and use strip line
> technology to ensure the swr is dead flat from 160-6m. [ no comp caps
> used either]
> ## One caveat with the 6 x pack.... being a 2 x 6 matrix switch means ALL
> 6 x ant ports, when NOT in use, have floating center conductor's !
> ## IE: radio 'A' is on ant #3..... and radio 'B' is on ant #5.... ant
> 1-2-4-6 have open/floating center conductor's.
> ## when done for the night, and everything shut off, ALL 6 x ant ports
> are opened off.
> ## On my 15 kw rat pack, [ 1 x 6 remote switch] ALL un-used ants
> have their center conductor's GRNDED ! IE: all de-energized relays.
> later... Jim VE7RF.... owner of 6 pack SN 001
> On Mar 1, 2010, at 1:40 PM, "Barry Fox"<email@example.com> wrote:
>> I have two HF radios and 4 different HF antennas. I would like to use
>> each rig on any antenna, while obviously locking out that antenna for
>> the other rig. The commercial products 6-Pack, 8-Pack, etc are way
>> over my budget. Anyone have a schematic for a "4-Pack" or similar
>> device they would like to share? Obviously relays are the way to
>> go, and I can get the RF relay switching part of it on paper but
>> not the lockout logic. Some sort of electro-mechanical exclusive-OR
>> gate array / diode matrix? Anyone been there and done that?
>> TNX / 73,
>> Barry - W1HFN
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