Ten-Tec 243 - Page 2

4-79
l-2483
Pt. No.
74086
-
4-79
MODEIL
243
REMOTE
VEO
GENERAL
The TEN-TEC Model 243 Remote VFO is an accessory to the @MNI transceiving
system which allows two frequencies of operation. A MODE switch with LED indica-
tors provides selection of any one of six modes of operation: ®MNT transmit and
receive; REMOTE transmit and receive; ØMNI transmit-REMOTE receive; REMOTE trans-
mit-@MNI receive; @MNI transmit-both receive; and REMOTE transmit-both receive.
Full, instant break-in is retained no matter what mode is selected, and because
of the broadband design in the @MNI, frequencies, even though far removed from
one another but on the same band, will be processed equally and under optimum
conditions in the transmitter without adjustment.
In addition to the remote capability, a four position crystal oscillator
may be selected as the remote generator for fixed frequency operation, such as
for MARS or net operation. Out-of-band crystals within limits outlined below
may be selected, as well as in-band frequencies.
Model 243 covers all amateur HF frequencies between 1.8 and 30.0 MHz.
INSTALLATION
To install the Model 243 into the early model @MNI system:
1.) Remove the bottom cover of the @MNI according to the instructions on
Page 3-1 of the ØMNI manual. Remove jumper wire soldered between the
center contacts of the VFO IN and VFO OUT phono jacks on the ØMNI rear
panel. on later models, simply remove external jumper plug.
2.) Insert the 9 pin MOLEX plug on tne end of the multi-conductor cable on
the rear of the Model 243 into the @MNI ACCESSORIES socket. DO NOT
FORCE THE CONNECTOR.
3.) Turn the @MNI on. The dial lights of the Model 243 should light. In-
sert the red-banded phono plug from the Model 243 into the VFO IN jack
on the @MNI. Switch to position 2 on the Model 243 MODE switch (EXT BOTH).
The @MNI should transceive from the Model 243. Insert the second phono
plug from the Model 243 into the VFO OUT jack of the @MNI. If the coax
leads are inadvertently reversed, the system will be inoperative.
OPERATION
1.) Select desired switching mode with the MODE switch. Determination of the
mode selected is by means of the four small LEDs located to the right of
the dial scale. The two red LEDs in the TX column indicate which unit
determines the transmitted frequency (XCVR or REMOTE), and the two yellow
LEDs in the RX column indicate the receiver frequency.
2.) If crystal control is desired, position the REMOTE switch to X-1 through
X-4. The LED indicators on either side of the main tuning dial will indi-
cate the change from VFO to XTAL control.
3.) If VFO control is desired, position the REMOTE switch to VFO position.
4.) The OFFSET control on the @MNI will only affect the VFO in the @MNI and
not the remote VFO.
5.) The REVERSE pushbutton is intended to prevent the common "cockpit error"
of transmitting on top of an out-of-band DX station. It is used when the
MODE switch is in position 3 through 6 (split operation). When pushed,
it reverses the receiver functions only. For example, in position 3 of
the MODE switch (TX on @MNI, RX on REMOTE), depressing the REVERSE push-
button will cause the functions to reverse, ie. RX on @MNI, TX on REMOTE,
without having to switch the MODE switch to position 4. However, if the
OMNI is put into transmit, system operation will be as indicated on the
indicator LEDs and MODE switch. RESULT: If you use the REVERSE push-
button to spot your transmit frequency in split operation, and you hap-
pen to transmit, you will not transmit on your intended receive frequency.