[1000mp] RE: FRB-5A Relay and the FP-29

[Joe Subich, K4IK]

> Well, we are almost there. If you read the manuals, pins 3 
> and 6 would seem to be unused. However, after installing 
> the FRB-5A relay in my Field, I realized that the new cable 
> supplied with it finds its way back to pins 3 and 6 on 
> the FP29. 

BOTH of my FP-29s (working and "dead") have no connection on 
pins 3 and 6 (the pins are missing).  There are wires in the 
supplied harness from the FT-1000MP/MKV but they connect to 
nothing in the power supply. 

> There is some voltage supplied by the FP29 at pins 3 and 6 
> to power the FRB-5A relay. I assume 12 volts with pin 3 
> being negative and pin 6 being positive but that is what 
> I am trying to find out. 

I think you are counting the pins incorrectly.  The FTV-1000 
supplies 30 volts on pins 1/4 FROM the "DC Power Out" jack 
TO the FRB-5A where the 30 Volts (pins 1/4) activate the relay 
to allow the MP/Field to provide RF out (HF) when the FTV-1000 
is not being used.    

Double checking my Mark V manual shows that pins 3/6 from the 
Molex connector on the MKV and in the supplied cable) are 
a dry contact pair which is closed when the Mark V is turned 
on.  It appears that this was originally designed to control 
the power supply on/off remotely but not implemented to avoid 
mixing high (110 or 220 VAC) and low (12/30 VDC) in the same 
cable assembly (probably for UL/CSA/etc. approval purposes).      

> If I use separate 12 V and 30 V supplies (which I have on 
> hand) I want to get it right. 

If you are using separate power supplies, ignore pin 3/6 at 
the input to the FTV-1000.  The 12/30 volt supplies power 
only the FTV-1000. 

73, 

   ... Joe, K4IK