Equipment information
Drake MN-4 Other
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Model:
MN-4
Date:
Category:
Group:
Description:
Matching Network
Information
The typical modern Transmitter has a pi-network tank circuit
and will work into resistive loads of 50 to 75 ohms with
Voltage Standing Wave Ratios (VSWR) of 2:1 or less* This
resistive load can only be achieved with a resonant antenna;
thus for multi-band operation multiple antennas are
required. Space and cost considerations render this solution
impractical for most amateurs- The MN-4 impedance-matching
network can:
1. Measure feedline VSWR, then reduce the VSWR at the
Transmitter output to 1:1.
2. Monitor Transmitter power output in watts directly and
continuously.
3. Attenuate 2nd harmonic output from Transmitter by 25 to
35 dB; thus it may eliminate the need for a low-pass TVI filter.
4. Match an Antenna to a Transmitter having fixed loading.
5* Give optimum match with multi-band antennas.
6. Precisely match Transmitter to an Antenna across a
complete amateur band.
7. Permit "off the air" Transmitter tuning and Antenna
matching at low power using dummy load.
8. Stores Antenna loading adjustment for Transmitter when
switching from "barefoot" to linear Amplifier operation3 as
network is by-passed in DIRECT position of bandswitch.
9. Match Transmitter output to linear Amplifier which does
not have 50 ohm input impedance.
10. Help localize trouble by comparing Transmitter output
into Antenna and into dummy load.
Manual Type:
Service and User Manual
Pages:
11
Size:
162.38 Kbytes (166277 Bytes)
Language:
english
Revision:
Manual-ID:
Date:
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
2017 08 09
MD5:
24eb38aea745da60c430e3683e2aaaa4
Downloads:
578
Information
1. Specifications 1
2. Description 2
3. Installation 3
4. Operation 4
ILLUSTRATIONS
Schematic Diagram 9