I don't believe it takes its power from the 590, at least mine does not.
  I think it is the tipical coax plug or whatever you call those things, 
centr positive, shell ground.  I think it is worth while, just to 
protect the relay contacts in the rig.
73
Butch
WA0VJR
Node 3148
Wallace, ks.


On Fri, 29 Aug 2014, Dave Basden 
wrote:

> I used one with my TS-480, but haven't gotten it set up with my
> TS-590 yet.  I did get the cable to do that though.  It's probably
> not necessary with even a relatively new amplifier design and my
> Fl-2100F is over 30 years old now, but it is convenient.  It avoids
> wiring your own plug to attach to the radio.  As I recall, it takes
> it's power from the TS-590, so an external power source is
> unnecessary, but I could be remembering that wrong.
>
> 73,
>
> Dave, W7OQ
>
> At 07:47 AM 8/29/2014, you wrote:
>> Are any of you guys on the list using the Ameritron ARB 704 relay buffer
>> between your radio and amplifier and if so how do you like it?  If you are
>> using the ARB 704, how do you power it.I have one that I have had for
>> several years and I have lost the wire that I think powers the ARB 704.  I
>> am trying to find out about it so I know if I need for Ameritron to send me
>> a new one or if I can get one made up.  I would like to use this relay with
>> my bedroom radio.  I will appreciate any suggestions on this.
>>
>> Thanks much,
>
>