Hi Pete
As I know
RCS-4:
SIGNAL - 3 relays, tree topology, signal goes always through two relays
CONTROL - 12V through coax / 1pos GND / 2ps DC- / 3pos DC+ / 4pos AC /
RCS-8
SIGNAL - 5 relays, star topology, signal goes always through one relay
CONTROL - positive control voltage / 5 wires + return, one for each pos /
RCS-10
SIGNAL - 7 relays, tree topology, signal goes always through three relays
CONTROL - positive BCD control voltage / 3 wires + return /
73 Jozef OM7ZZ
Jozef Urban, OM7ZZ
microHAM - Ham Radio Accessories
url : http://www.microham.com
e-mail : microham@microham.com
-----------------------------------------------------------
phone/fax +421 2 4594 5100
gsm +421 905 572 241
> The current MFJ catalog's write-up on the RCS-8V is a little
> confusing. The first paragraph says you can control it with standard
> telephone wire, which is 4-conductor, while later on in the ad it says
that
> it needs a 6-conductor cable. This matters because I remember W8JI
writing
> about a design change to using BCD control, to reduce the number of wires
> involved. If this has been done on the RCS-8V, and if it uses simple
relay
> decoding of the BCD signal, then the internal signal path must be quite
> different than in earlier models. From the description, the RCS-10, which
> uses a 3 or 4 conductor control line to select one of 8 antennas, must use
> BCD control, but I don't know whether they use an IC to decode the signals
> or use the relays. If Tom's reading this, perhaps he can clarify.
>
> 73, Pete N4ZR
> The World HF Contest Station Database
> was updated on April 26, 2004
> 2706 contest stations at
> www.pvrc.org/WCSD/WCSDsearch.htm
>
>
>
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> End of TowerTalk Digest, Vol 16, Issue 92
> *****************************************
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