HF PACKER
AMP
V4R6
Page 39
second meter not available, reconfigure meter to
measure voltage.
•
Re-connect DC power if not connected as this time.
•
Measure from Case to the rectifier tab, D4, next to the
electrolytic capacitors. The voltage is the DC Input
Voltage. Approximately 13.6V. Record _____ VDC
•
Use the screw driver again to jumper the TEST pins of
H3. The LED lights and you measure about 29.5VDC.
Record _____VDC
At this point, you have proven the functionality of the
AMP and you have completed the adjustments.
•
Remove Power. Install LPF into the case. Secure with
two 4-40 x ¼ inch screws.
•
Attach front panel nut and tighten. Install Knob and
tighten.
LPF RF Testing
Although not as good as a VNA, you should be able to tweak
the band edges. This procedure also provides a way to test
signal continuity from the LPF IN to the SO239 connector out.
These steps describe a method to test the LPF for signal
continuity and performance at the band edge. In this test the
AMP output is bypassed and the transceiver is used as a
signal source.
1. The RF In cable normally at J3 on the amp board is
rerouted to plug instead into the LPF input connector, J1. You
will have to physically free this cable up to re-route to the LPF
input.
2. Attach transceiver to BNC connector on the case. Set the
transceiver RF out to about 1W.
3. Attach a watt meter and dummy load to the SO239
connector.
4. Jumper the PTT input to cause the LED to light. You must
be ONLINE for this to work.
5. Set the band switch to 160M and the rig to 160M at the top
of the band.
6. Key the transceiver. You should see your 1W (or slightly
less) on the watt meter.
7. If the watt meter is attenuated, try in the middle of the band.
If the signal comes up, you need to adjust your 160M inductor.
Try spreading the turns. If still no joy, you may have to remove
1 turn.
8. Repeat this process for all bands. Removing a turn probably
only applies to 160 - 40M. All other bands are adjusted by
spreading or squeezing the coils (stop RF while adjusting).
9. After satisfactory completion of the tests and adjustments,
restore the RF In cable back to J3 on the AMP board.
LT1270ACT Alert Notice
"Be careful when probing around the DC
‐DC Converter
have received one user report of the chip arcing and going
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