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AFSK Output Level
VHF
The AFSK output level from the KAM Plus to your VHF transceiver may be adjusted using potenti-
ometer R-10 and jumper K2. When the K2 jumper is placed on one post only, the output level may
be adjusted from 2 mV
pp
to 60 mV
pp
. Placing the jumper on both posts allows adjustment from
40 mV
pp
to 2 mV
pp
. This level should be adjusted to provide approximately 3.5 kHz deviation on
your radio.
HF
The AFSK output level from the KAM Plus to your HF transceiver may be adjusted using potentio-
meter R-28 and jumper K9. When the K9 jumper is placed on one post only, the output level may
be adjusted from 20 mV
pp
to 400 mV
pp
. Placing the jumper on both posts allows adjustment from
200 mV
pp
to 4 mV
pp
. This level should be adjusted to provide full power output from your HF radio
and very little deflection of your ALC meter.
Hand Held modification
Jumper K3 on the KAM Plus provides an alternate means to connect your VHF hand-held radio to
the KAM Plus. If you do not want to include the interface circuitry shown in the Getting Started
manual into your cable, you can place jumper K3 on the center post and the post marked HT. This
provides the isolation and keying necessary for most ICOM and Yaesu hand-held radios, and other
radios which use similar keying circuits. If you make this change, you must not connect the PTT
line from the KAM Plus to your mic jack.
Watchdog Timer
The KAM Plus has a Push-to-Talk watchdog timer for the HF port and a separate watchdog timer
for the VHF port. These watchdog timers are both enabled at the factory by placing jumpers K4
(HF) and K5 (VHF) on just one post. If the KAM Plus attempts to keep your radio transmitting con-
tinuously for over 2½ minutes, the watchdog timer will activate and release the PTT line to your
radio. NOTE: This also applies when operating RTTY or other HF modes, so you may want to dis-
able this for your HF port. Current FCC rules require a watchdog to detect such a failure and stop
the transmission.
You may disable the watchdog timer for either port by placing the appropriate jumper (K4 or K5)
on both posts.
Assembly and Disassembly of your KAM Plus
Should you require access to the KAM Plus to reposition jumpers or for any other purpose, disas-
semble as follows:
1. Turn off power to your KAM Plus and disconnect all cables from the unit.
2. Using a small phillips screwdriver, remove the two rear panel screws just far enough to free the
panel and bezel.
3. Slide the PC board out of the case from the back.
To reassemble, reverse the procedure above. Be careful to align the LEDs with the holes in the
front panel as you re-insert the board. You may find it helpful to remove the front panel first, in-
sert the board, and then re-install the front panel.
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