MIDLAND 13-505 Solid State Amateer In Transceiver
FEDERAL COMMUNICATIONS COMMISSIONS REQUIREMENTS
Your new Midland 13-505 is a combination receiver-transmitter designed and built for the VHF Amateur Band designated by the Federal Communications Commission. You are required to have the proper class of AMATEUR LICENSE prior to operation of this unit. F.C.C. regulations will be
violated if you transmit with this unit prior to receipt of your AMATEUR LICENSE.
NOTE
The technical information, diagrams, and charts provided in this manual are supplied for use in servicing this transceiver. It is the users responsibility to see that this unit is operating at all times in accordance with the F.C.C. Rules and Regulations.
Your 13-505 is a versatile, all solid-state, professional quality transceiver providing 12 crystal controlled transmit and receive channels on VHF Amateur Band of 144 to 148 MHz. This transceiver is designed for installation aboard cars or pleasure boats and will provide years of reliable service
with ordinary care. The transceiver has many unique features such as separate transmit and receive channel control system, modulation quality monitor system, provision for tone burst signal input, discriminator-meter, S/RF power/SWR meter, high and low transmitting power switching facility, etc.
It also features RF power protection circuitry which protects the expensive RF power transistors from possible damage due to short or open antenna circuit conditions or the use of an improper antenna system which would cause excessive mismatching. This makes the transceiver very easy-to-
use and reliable. We strongly suggest you to read this Owner’s Guide carefully before operation so that you may receive full benefit from this transceiver.
OPERATING CONTROLS AND FUNCTIONS
OFF/VOLUME
This turns the set on or off and controls the sound output from the speaker when receiving.
The VOLUME control does not affect transmitting output.
SQUELCH
Quiets the receiver when signals are not being received and allows a quiet standby operation. It
functions only in the receive mode and does not affect the receiver volume when signals are being
received. To adjust; When no signals are present, rotate the squelch control clockwise until the
receiver is quieted. Incoming signals will automatically release the squelch. Careful adjustment is
necessary as settings too far to the right will not allow weaker signals to release the squelch.
“RX/COM” CHANNEL SELECTOR
This controls both transmitter and receiver frequencies simultaneously if the “COM-SEP” switch is
placed in the “COM” position. If the “COM-SEP” switch is placed in the “SEP” position, it controls
only the receive frequency.
“TX” CHANNEL SELECTOR
This may be used to select your transmit channel when the “COM-SEP” switch is in the “SEP”
position.
COM-SEP SWITCH
This selects the mode of operation, see descriptions under “RX/COM” CHANNEL SELECTOR and
TX” CHANNEL SELECTOR.
RF-SWR PUSH SWITCH
With this switch in the out position, the transmitting RF power output can be checked on the power
meter scale.
To check SWR of your antenna system depress the switch and SWR will be indicated on the lower
SWR meter scale. The recommended value of SWR is less than 1.5, but a value of 2 or less should
give satisfactory results in practical transceiver operation.
PRIORITY SWITCH
This switch, when depressed, selects both transmit and receive frequencies decided by the crystals
inserted in the channel “A” sockets regardless of the channel selector switches. In this model
transmitter frequency of 146.34 MHz and receiver frequency of 146.94 MHz will be automatically
selected unless you change the crystals already inserted in the “A” channel crystal sockets at the
factory.
TEST SWITCH
This switch, when depressed, cuts off the transmitter’s final power stage and leaves the receiver
circuit on, even when the push-to-talk switch is depressed. Therefore, when you depress the switch
you can receive your own transmitter’s signal with your transceiver, enabling you to monitor or
check transmitting characteristics such as modulation, sound quality, etc.
To do this proceed as follows:
1. Depress the TEST switch.
2.
Place the COM-SEP switch in the SEP position.When the COM-SEP switch is placed in the SEP position, the RX/COM channel dial light will light
up in normal brightness but the TX channel dial light will grow dimmely, indicating that the TX
channel is ready to be operated. But when the Push-to-Talk switch is depressed the TX channel
dial light will grow brightly and the RX/COM channel dial light will be off.
DISCRI-METER
This meter indicates the receiving condition in terms of frequency. The pointer at the center position
ndicates that your receiver is exactly tuned to the signal you are receiving
This meter can also be used as a simple frequency calibration nullindicator. For example, tune the
receiver to the known channel center frequency or to a reliable station emitting a known frequency
and observe the meter pointer. If the pointer is shifted from the center position of the meter scale,
tune your receiver by adjusting the appropriate local oscillator trimmer so that the meter pointer
indicates the exact center on the scale. Thus your receiver can be easily calibrated.
The transmitter frequency of your transceiver can also be calibrated in the similar way. In this case
proceed as follows:
1. First, calibrate receiver section of the transceiver as just described above.
2. Depress the TEST switch and place the COM-SEP switch in the SEP position.
3. Set the TX channel selector to the channel which has the same frequency as that of receiver
channel already calibrated.
4. Press the Push-to-Talk switch and observe the DISCRIMETER pointer.
5. If the pointer is not in the center position, adjust the transmitter oscillator trimmer so that
the meter pointer reads the exact center on the meter scale.
S/RF/SWR METER
This meter will be used in three ways.
1. Signal Strength Meter
The upper scale numbered 1, 2 . . … 9, 30 will be used as a “S” meter and indicates a relative
signal strength of the signals received.
2. RF Power Meter
The middle scale is used for RF transmitting power indicator. The center of left separate scale
indicates 5W and that of right separate scale 30W.
3. SWR Meter
The lower scale will be used for checking SWR of your antenna system connected to the
transceiver. Refer to the description under “RF-SWR SWITCH”.
NOTE: The above three scales are caribrated to give correct indications when a 50 ohm resistive
antenna is connected to the ANT jack on the rear panel.
MIC JACK
Used for Push-to-Talk microphone connection.
ANT JACK
Used for antenna connection.
Documents / Resources
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MIDLAND 13-505 Solid State Amateer In Transceiver [pdf] User Guide 10-30, 13-505, 13-505 Solid State Amateer In Transceiver, Solid State Amateer In Transceiver, State Amateer In Transceiver, Amateer In Transceiver, In Transceiver, Transceiver |