Here's the marketing information:
DTR Series
Single Band, CW Transceivers
DTR 3-5 (3.5 / 3.6MHz) DTR7-5
(7.0 / 7.1MHz) DTR10-5 (10.1 / 10.2MHz)
These little rigs can produce
any output power from less than 25mW to around 8W. They all have
a very effective 7 pole low-pass filter resulting in a harmonic
level of better than 50dB below the main output.
The receiver incremental tune
(RIT) allows about +/- 4kHz of fine tuning around the transmitter.
And the stable VFO is controlled by the new Jackson calibrated
ball-drive - well known for its clean appearance and smoothness
of operation.
Receiver (DC) sensitivity is better
than 1microV minimum discernable signal (MDS) and selectivity,
with the included audio filter, is around 250Hz @ 6dB. A 12 dB
(switchable) attenuator deals with any high-powered AM breakthrough.
Power requirements : 12/14Vdc,
1A (key down) at 5W output.
Connectors : 1/4" jack sockets for key and 'phones (8 ohms),
SO239 (antenna) and phono (power).
Case : Heavy gauge aluminium, finished in black enamel, with
printed acetate facias.
Kit price - £98.70 Built to order - £168.00
Postage (UK) £4.00
TU4 Antenna Tuning Unit (note: this is probably slightly different
to the TU2 above?)
Very similar in style to the DTR
series of transceivers, the TU4 is conservatively rated at 80W
and covers the HF spectrum.
Based on the well proven "L-Match"
circuitry, the TU4 can be configured into any of three different
arrangements, making it easy to obtain a match with a wide variety
of transmitter/band/antenna combinations.
The LAKE "PLANAR" inductor
is a feature of the unit. PCB based, the coil is of flat rectangular
form rather than the traditional helix. There are several advantages
to this system - the unloaded "Q" is around 60, measured
at 5MHz, self capacitance is low, about 5pF, and tappings are
easily arranged in exponential increments of inductance.
The tuning capacitor is a high
grade air-spaced unit made by Jackson.
The built-in SWR meter is exceptionally
sensitive. Based on the 'Bruene' bridge circuit, less than half
a watt is sufficient to give full scale deflection of the meter
at 3.5MHz. Ideal for QRP operation!
GENERAL SPECIFICATION
Frequency range : 1.5 - 30MHz
- Power rating : 80 watts (CW) Includes 4:1 Balun for balanced
output
Dimensions : 210 x 190 x 85 mm. - Weight : 0.9 kg.
Terminations : SO239 (to transmitter), SO239 to the antenna plus
4mm terminals for direct connection to an end-fed wire, earth,
and, if necessary, balanced feeder.
Case : Heavy gauge aluminium, finished in black enamel with silver-grey
facias on front and rear panels.
Kit price : £68.00 Ready Built : £88.00
Postage : (U.K.) £4.00 |