Eddystone EC10
Receiver
Updated
19.8.06
Frequency coverage - 550 kHz to 30
MHz (in five bands)
Intermediate Frequency - 465 kHz
Sensitivity - <5uV for 15dB s/n
ratio
Image rejection - 50dB at 2.0 MHz, 20dB at 20 MHz (basically
useless on higher HF!)
DESCRIPTION
Eddystone's first transistorised HF
communications receiver was introduced in the late 1960s in the Uk for the
pricely sum of £48. In its day it was a radio to be envied, but by modern
standards it was distinctly lacking, especially towards the higher HF bands.
This was because of its low IF frequency and poor dial bandspread. The whole 10m
band covered about 10mm of dial!
It used germanium transistors which were still common at that time. At lower frequencies the bandspread and image rejection were better and many found use as tunable IFs for 2m and 70cm converters in the time when people tuned "high to low" and used fixed crystal controlled transmit frequencies.
Like all Eddystone receivers it had the usual smooth flywheel tuning dial which effortlessly tuned when the knob was spun.
Coverage was from 550 kHz to 30 MHz in five ranges. A BFO was used for CW and SSB reception possible and, a narrow audio filter helped a bit on CW.Good examples sell for £100 or more, which is way above their intrinsic value. It is of historical interest, but not a serious receiver for use in 21st century band conditions.
IMAGES
Side
view of an early Mk 1 version with the original smaller grey knobs.
Underside
view showing loudspeaker and RF coils
Topside
of main PCB showing the classic Eddystone flywheel drive mechanism
that made all Eddystone receivers of this vintage so user-friendly
and smooth to use.
Later
version of the Mk 1 with newer style knobs.
Rear
view of the Mk 1 showing battery compartment (top half) and antenna
connectors (lower LHS).
The
later Mk 11 version with a new colour scheme, S-meter and fine tuning
control, but still the same poor selectivity and image rejection
on higher HF bands!
Examples
of Eddystone manuals (see below to obtain copies)