Do you remember?
Sparta 603 and 605B were on display at the NAB convention in 1977. Both
models used a 3CX3000A7 tube in the final amplifier. The transmitters
boasted features such as an automatic power control, vacuum-variable
capacitors in the driver section, a solid-state, direct-FM 680 exciter
with automatic frequency control, full metering of important
parameters, tally light fault locators and an automatic recycle. The
603 and 605B were capable of 3kW and 5kW respectively.
In and ad from 1977, Cetec Sparta bragged that it was the only
transmitter manufacturer to make both AM and FM solid-state
That was then
This photo of the air studio for WTAQ-AM, LaGrange, IL, appeared on
the cover of Broadcast Engineering in November 1969. At 1300,
the WTAQ call letters indicated that the station served the "towns
along the Q." The "Q" was the Chicago, Burlington and Quincy
U-shaped layout was designed to handle both talk shows and "standard DJ
programs" as the article details. The solid-state console (another
bragging point for 1969) had four pots, with inputs set up for six
microphones, five telephone lines, two turntables and a cart
The walls were covered with ¼" thick, veneer plywood,
perforated every ½". The space between the inner and out walls was
filled with fiberglass insulation.
A single cart machine was mounted in the cabinet just behind the
operator. A remote machine control box is to the right of the console
and the telephone line selector is on the left. The two microphones are
Electro-Voice 666 models.
Today, the station on 1300 is WRDZ.
Can you identify the console or the turntables? E-mail us at
firstname.lastname@example.org and tell us what
you think they are.
Sample and Hold
A look at the technology shaping radio
DAB around the world
Source: The World DAB Forum, August 2001