Fred,



Not all radios need power for this unit.   Many  get the 12 vdc needed 
from the     radio via the plug and play cable.  But since you had it 
powered before, I guess you need to power it again , unless you have 
changed radios to one that doesn't need external power.


It's just very low current 12 vdc, so a wall wart  will work if you have 
one laying around.

If you lost the plug and play cable,  you can get someone to make one 
for you or buy it from MFJ..     Depending on how your radio  outputs 
keying, you may be able to just use the RCA jack on the unit and skip 
the din connection.  In this case you would need to  add external 12 v 
power to the power jack.



It does what it is supposed to do.  Always a argument as to whether it 
is really needed depending on what radio and amp combo.   I have one 
here and use it sometimes and sometimes  not.

73, Steve KW3A
On 8/29/2014 10:47 AM, Fred Adams 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,
>
>
>