Equipment And Accessories Supplied; Differences Between The Qmt-1B And The Qmt-1; Table 1-2 Equipment And - JPS QMT-1B Installation And Operation Manual

QMT-1B Operations Manual

1.8 Equipment and Accessories Supplied

Table 1-2
QMT-1B Shipping Level - JPS P/N 5170-200000
Quantity Item
1 QMT-1B Final Assembly
1 DC Power Supply [100 to 240 VAC, 47-63 Hz to +12 VDC]
1 Accessory Kit

1.9 Differences between the QMT-1B and the QMT-1

The QMT-1B is a modern redesign of a previous JPS product, the QMT-1, and maintains
compatibility with that unit. Some improvements were made in the new design which
necessitated some differences between the two units. In most cases these differences will be
transparent to the user. The differences are outlined below.
• The pinout of the Audio/Control connector on the rear panel of the unit is different
between the QMT-1 and the QMT-1B. The QMT-1B pinout has been changed to match
that of other JPS products such as the ACU product family. This allows standard JPS
radio cables to be used with the QMT-1B with no adapter needed. Previously an audio
crossover adapter was included with the QMT-1 to allow standard JPS radio cables to
be used. This adapter is not required with the QMT-1B and is not included. Please refer
to the pinout of the Audio/Control connector.
• The QMT-1B uses transformer-coupled balanced audio for both input and output audio.
The QMT-1 only had balanced input audio and single-ended output audio.
• The QMT-1B audio input and output levels are remotely adjustable via the web browser
interface and are saved in non-volatile memory. This allows audio level adjustments
without requiring the operator to be at the location where the QMT-1B is installed. The
QMT-1 had rear panel mechanical potentiometers for the adjustment of audio input and
output levels.
• The QMT-1B uses hardware relay contacts for PTT output while the QMT-1 had a
solid-state (open drain transistor) keying output. There is a jumper selectable solid-state
output available on the QMT-1B as well, but the default is to use the relay for PTT. The
relay allows for higher keying voltages and currents than the solid-state output.
Equipment and Accessories Supplied
End of Section One
1-6
JPS P/N
5200-300000
1620-240061
5200-300150