HI Dave
The description on the DXE website for the RCS-4 is correct. We measured it and
posted what we found.
73
Tim K3LR
At DX Engineering
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of David
Gilbert
Sent: Wednesday, October 23, 2019 10:12 PM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Remote switch
From what I've read over the years, the RCS-4 has pretty poor
line-to-line isolation. Simple doesn't give you very good isolation,
and the way that the RCS-4 uses three relays to get four channels is
especially weak for that. I even find it odd that on the DXengineering
website the port-to-port isolation is specified as being LESS than 30dB,
which sounds backwards to me but maybe they're just being honest.
The MS-S4A shorts the unused ports, and the contacts in the MS-S4A have
three times the current rating of the RCS-4.
I'd build my own remote switch with input and output relays for each
channel before I'd buy the RCS-4. At least I'd know the solder joints
were good.
Dave AB7E
On 10/23/2019 6:24 PM, Kim Elmore wrote:
> The Ameritron switch uses your transmission line to supply power
> through a bias-T. Two polarities of DC plus AC and no voltage yield a
> 4 position switch. It's delightfully simple: mine is an ancient
> Heathkit HD1481, which works the same way the Ameritron switch does.
> I've never measured the isolation on mine, but the two look almost
> identical. Mine has been through a fair bit of abuse and has soldiered
> on admirably. Yes, I did burn up some traces on the remote PCB (fed a
> non-resonant antenna at 1+ kW through a tuner), but some jumpers
> across the burned up traces and it's been good ever since. Should mine
> ever suffer a catastrophic, non-repairable failure it'll get replaced
> with an Ameritron RCS-4.
>
> Kim N5OP
>
> On 10/23/2019 2:13 PM, Wes wrote:
>> Anyone have any experience with one of these?
>>
>> https://www.ebay.com/itm/MS-S4A-WEB-controlled-REMOTE-ANTENNA-SWITCH-4-POSITIONS-2-KW-PEP-Ready-for-use/202778787695?hash=item2f368ebf6f:g:ec4AAOSwmxVceS5L
>>
>>
>>
>> Not too interested in web interface, manual is fine.
>>
>> Wes?? N7WS
>>
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|