DESCRIPTION
The VFO 1000/Collins is a direct digital synthesizer programmed
to enhance the operation of Collins S-Line receivers.
There are 30 tunable memories that are programmed to provide the
functions of VFO, MEMORIES, and GENERAL COVERAGE reception. The
first 6 memories are factory assigned for the 80 meter to 10
meter ham bands. The remaining bands are assigned to provide
general coverage of the shortwave bands. They can be easily user
re-assigned in any way you wish up to 30MHz. Some memories
could be your favorite net frequencies, others could be used for
shortwave broadcast stations. The encoder has 5KHz, 1KHz,
100Hz, and 10Hz tuning steps, and can be locked to prevent
accidental changes. An LED indicates when the
encoder is active. There is a 50KHz step available in the
setup mode to speed-up frequency entry.
Included is a crystal controlled 2.7MHz oscillator to replace
the receiver internal VFO. This gives complete control of
Frequency Accuracy, and Stability to the VFO 1000.
FRONT PANEL CONTROLS
BAND is a dual push button switch used to step close to
the desired frequency.
TUNING KNOB is used for fine tuning.
PUSH BUTTON changes the tuning
step.
Fine
Switches between 10Hz and 100Hz
Normal
For
5KHz steps, push and hold then push band up
For 1KHz steps, push and
hold then push band down
ADAPTER SWITCH Switches between the
VFO and ham band crystals.
2.7MHZ OSCILLATOR SWITCH Switches
the oscillator ON and OFF
ON - Toward the Back
OFF - Toward the Front
BACK PANEL
POWER: Red RCA jack and the red switch. 12 to 20
VDC.
OUTPUT: White RCA jack.
2.7MHz OSCILLATOR POWER: Black RCA jack.
TUNING LOCK is the toggle switch. It is used to
disable the tuning knob, to prevent accidental changes. A
front panel LED indicates that the tuning knob is active.
INSTALLATION
Included is an adapter with a tube socket. Remove the
crystal oscillator tube, from the receiver. Plug the tube
into the adapter, then plug the adapter into the receiver.
Connect the coax cable from the RCA jack on the adapter to the
WHITE VFO jack. Plug the power cord into the red RCA
jack. The screw on the back is for ground.
To install the oscillator, remove the PTO/VFO tube and slip the
eyelet over pin, 1, large end first, then plug
it back in. Viewing the bottom of the tube, pin 1 is the
first pin counting clockwise starting at the space. It
helps to temporally tape the wire to the side of the tube to
hold it in place when plugging it back in. Ground the
black wire. Connect the small RCA cable from the
oscillator to the BLACK RCA jack on the VFO. The switch is used
to select either the receiver VFO or the oscillator.
OPERATION
Switch the 2.7MHz ON (toward the back). When using the 2.7 MHz
oscillator, set the tuning dial on the receiver to zero
"0". Use the BAND switch for course frequency
adjustment. Final tuning is done using the tuning knob on
the VFO 1000 and the operating frequency is displayed on the LCD
display. Select 1KHz tuning steps by holding the STEP
button then push the BAND DOWN switch. Select 5KHz tuning
steps by holding the STEP button then push the BAND UP switch.
If you prefer traditional Collins tuning, set the VFO display to
read the low end of the desired 200KHz segment, and switch the
external oscillator off (toward the front). Then tune
using the receiver tuning knob. The operating frequency in
this case is the VFO display plus the receiver dial. The
tuning knob on the VFO can be disabled to prevent accidental
changes.
Calibrate
For high accuracy, all bands that you use must be calibrated
To enter the setup mode, turn on power using the rear panel
power switch while pushing STEP button. Then SETUP is
displayed, release the STEP button.
First accurately tune a station to calibrate against. You
can calibrate against an AM shortwave station using the SSB mode
and it will be very accurate. If the display is not
reading correct, Power Down the VFO. The VFO frequency
will be stored.
To enter the setup mode, turn on power using the rear panel
power switch then quickly push and hold the STEP button.
Then SETUP is displayed, release the STEP button.
When "Cal. Bands" is displayed, push the STEP button.
Using the TUNING KNOB, tune the display to read the frequency of
the known signal. The VFO frequency does not change, only
the display changes. Next push the Up or Down switch to
store the correction, then Power Down the VFO.
That band is now calibrated. Repeat this for any other
bands you wish to calibrate.
SETUP
The following setup instructions are for reference, just in
case some unknown event causes your unit to require a full
setup.
Set The Number Of Bands
When the "Set # Bands" message appears, Push the STEP
button. Use the Band up/down switches to set the number if
bands to anything from 1 to 30. When finished, press STEP
button to exit, then it will go to normal operation. If
you add bands, those extra bands may have bad data in them, so
you should check the other setup data for those bands.
Set IF Offsets (Indicated by an "F")
When the "Set IF Offsets" message appears, Push the STEP button.
Push the step button again to enter the 50KHz step mode.
Select the desired band, and enter the IF OFFSET shown in the
chart below. The tuning step is 50KHz in this
mode. Step to the next band and enter the offset.
Next push the Up or Down switch to store the last entry, then
Power Down the VFO.
On Collins radios enter -3.150 on all bands, then switch to 5KHz
step and change the 0 to 5 on all bands.
Set Band Freq. (Indicated by an "S")
The Band Frequencies are the starting point for each band.
The last frequency used on a band is stored and becomes the
starting point the next time that band is selected. When
the "Set Band Freq" message appears, push the STEP button.
Push the step button to enter the 50KHz tuning step.
Select the desired band number and enter the desired BAND
FREQUENCY. Repeat this procedure for all bands. Next
push the Up or Down switch, then Power Down the VFO.
Reset/Clear : D O N O T
D O T H I S
DOING THIS WILL DELETE ALL OFFSETS
AND
FREQUENCIES AND WILL REQUIRE A
COMPLETE RE-PROGRAMMING. IT CANNOT BE USED TO RE-ASSIGN
ONE BAND.
When the "Reset/Clear" message appears, Push the STEP
button. You are asked to confirm with another STEP button
press. All IF Offsets and Band Frequencies are set to
0.0. Progress is displayed on the LCD.
If you do nothing when it asks "Confirm" then after a few
seconds it will say "Nothing Done" In either case it
proceeds to normal operation.
In case you need to reenter the IF Offset and Band Frequency
data.
The Band Frequencies can be anything you prefer up to 30MHz, or
reenter the factory settings below. The Band Frequencies
are only a starting point to get close to your desired frequency
The IF Offset is (minus) -3.155MHz on all bands.
On Collins radios enter -3.150 on all bands, then switch to 5KHz
step and change the 0 to 5 on all bands.
FACTORY BAND SETTINGS
1 3.5
11 7.5
21 12.5
2 7.0
12 8.0
22 13.0
3 14.0
13 8.5
23 13.5
4 21.0
14 9.0
24 15.0
5 28.0
15 9.5
25 15.5
6 28.5
16 10.0
26 16.0
7 4.0
17 10.5
27 16.5
8 4.5
18 11.0
28 17.0
9 5.0
19 11.5
29 17.5
10 6.0
20 12.0
30 18.0