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rig. 2. Rep eat er hardware b lo ck d iagram. Microcomput er pr o vides all timing and co ntro l.
Pho to C. Rep eater control board. Ma in board mounts on the csbinet 's " fro nt door. "
Cl ock wise from up per right are CPU-"1 A m icrocompu ter, audi o delay line, audio m ixers,
pho ne patch, and dc-de con verter.
over anyone . Since an ID is
req u ired at least every te n
m inu t es, start ing a t six
minut es in th e rep eater
lo oks f o r a han g-ti mer ti meou
t to work in its ID. By
nine m inutes in, it wi ll try to
ID at the end of a user's
tr ansmission and, if all else
fa il s, Exor w ill get out his
key and ID in M orse code
over a co nversation at ten
minutes in. I f so meo n e
starts to t ra nsm it w hile he's
spea king, he'll stop and
wait f or ano t he r o pportu nity
so as not to be rud e.
A n aud io t ap e ca rt rid ge
m ach in e contain s ano ther
v o ice ID- th is o ne by
Nancy . She is touchtone
com ma ndab le and also
comes u p every t hirty m in ­
utes on the hour and half
ho ur for a time-remind ing
ID. If a QSO is in progress
w hen she's scheduled to
spea k, she w aits until the
end (hang-t ime r t im eout).
A s a resul t , she never inter-
~ 126 73 Magazine · Octobe r, 1980