Most of the amps that require the use of devices such as the Ameritron
ARB-704 are old ones. Most modern-day amps can be keyed without problems by
today's transceivers, but the older amps often required voltages and
currents beyond the limited capabilities of modern-day transceivers.
Best 73
Alan
Alan R. Downing
Phoenix, AZ
-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]]
On Behalf Of Butch Bussen
Sent: Monday, December 01, 2014 11:00 AM
To: [log in to unmask]
Subject: 704 box
It is a buffer or isolator between radio and linear amplifier. Basicly,
this box as well as the one I sent a link to yesterday is keyed by the
small relay in the radio and the box then keys the amp. Most radios have
a very small voltage and current rating which isn't enough for some
amplifiers.
HTH.
73
Butch
WA0VJR
Node 3148
Wallace, ks.