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

[KC2HZW at aol.com]

In a message dated 12/28/2004 06:39:22 Greenwich Standard Time, k4ik at arrl.net 
writes:
The FRB-5A does not control anything in the FP-29.  It 
senses when the 30 volt line from the FTV-1000 is turned 
OFF (the 30 Volts is passed through when the FTV-1000 is 
OFF and cut off when the FTV-1000 is switched on). 

If the FTV-1000 is supplying 30 volts to the FRB-5A, the 
Field (or original MP) will operate normally,  If there 
is no 30 volts, the final amplifier of the Field/MP will 
be disabled.  In the 200 Watt Mark V, the 30 volt supply 
is used for the final amplifiers, if it is missing, the 
final and drive are disabled - the FRB-5A replaces that 
function for the original MP and Field. 

> I don't have an FP-29 and was going to use separate 12 V 
> and 30  V power supplies that I have on hand. I see that 
> the connection for the FRB-5A  passes through the 
> FTV-1000 and goes directly to the FP-29. I pulled up the  
> schematic for the FP-29 but they don't show the pin out 
> for the power output so  I couldn't see what the FRB-5A 
> is switching (or vice versa). 

The FP-29 pinouts are: 

   1  Ground (30 V) 
   2  Ground (13.8 V) 
   3  n/a 
   4  +30 V 
   5  +13.8 V
   6  n/a 

> Does anyone  know how this works? 

Do you have enough information to figure it out now? 

73, 

   ... Joe, K4IK 
Joe,

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. 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. If I use separate 12 V and 30 
V supplies (which I have on hand) I want to get it right. Thanks for your 
help!

73
Richard KC2HZW