Drake 1536 Owner Manual

AUX7 AUXILIARY PROGRAM BOARD, MODEL 1536

INSTALLATION & OPERATING INSTRUCTIONS

1	Introduction
The		AUX7 is	a	plug-in	unit which allows the user	to program up
to	8	auxiliary	500	kHz	frequency ranges for instant	selection from

the front panel of a TR7 or R7. In addition, a crystal socket is provided for each of the eight auxiliary ranges to allow fixed frequency receive and/or transmit (in the case of a TR7) operation within a selected range.

For receive only applications, programming is accomplished by using one RRM7 Range Receive Module per band segment. One of these modules is included with the AUX7. For transceive operation, one RTM7 Range Transceive Module per band segment is required.

NOTE:

Proof of license or other F.C.C. authorization must be submitted to the R. L. Drake Co. in order to obtain RTM7 Range Transceive Modules. All RTM7 Range Transceive Modules will be programmed at the factory to the specified frequency range.

2 Frequency Programming

Each Range Receive Module (RRM7) and Range Transmit Module (RTM7) must be programmed for a specific, integral 500 kHz range. The modules are programmed by removing pins in ac-

cordance with the	chart	shown in figure 1. Note that pin 10 of
the RRM7 module	has	been removed in production to provide

the transmit inhibit feature. On the RTM7, which is provided for transceive operation upon receipt of proof of license, pin 10 must not be removed unless it is desired to inhibit the transmit function.

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Follow the procedure listed in figure 1 exactly when programming a module. Carefully note the location of each module pin to be removed in accordance with the chart. Incorrect programming will result in operation on undesired frequencies, and could damage the transceiver.

The service department of the R. L. Drake Company will assist you in programming your RRM7 or RTM7 at no additional charge. Fill in the frequency range desired for each module to be programmed on the card provided. Our service department will fill in the post card, indicating which module pins to remove, and return it to you. Be sure to include your return address in the space prouided. Note that the card can also serve as a record of what ranges you have programmed into which channels.

Refer to figure 2 and install the range modules into the AUX7 in the desired location. Be sure that all module pins are properly seated in the appropriate socket, and that the index marks on the range modules are correctly oriented.

Note that each range module socket has a corresponding crystal

socket. To	operate on a fixed receive and/or transmit	(in the case
of a TR7)	frequency within a selected range, the	proper crystal

must be installed in the socket corresponding to the appropriate range module. Use the following formula to determine the crystal frequency:

Crystal Freq. (kHz) = 5050.0 kHz + Desired Carrier Frequency

(kHz) - Lowest Range Frequency (kHz).

For example, suppose it is desired to operate on a fixed carrier frequency of 4358.6 kHz. Referring to figure 1, this frequency falls in the 4.0-4.5 MHz range, so a range module must be programmed by clipping pins 2, 3, 4, 9, 11, 12, and 14. This module should be installed in the desired channel location on the AUX7. Channel crystal carrier frequency is then calculated as follows:

5050.0 kHz + 4358.6 kHz - 4000.0 kHz = 5408.6 kHz

Thus, a 5408.6 kHz crystal is required for fixed operation on 4358.6 kHz, along with the appropriate range module. Note that the fixed crystals will always fall in the range 5050.0 kHz to 5550 kHz.

2

When ordering a	fixed channel crystal, always specify the follow-
ing information:
1. Crystal frequency in kHz.
2. Frequency	tolerance + .003% or better.

3.Parallel resonant, 32 pf load.

4.Series resistance 35 ohms, maximum.

5.HC-25/U Holder.

Crystals of this type are available from several manufacturers, or can be obtained on a special order basis from the R. L. Drake Company.

3 Installation in TR7/R7

Once the desired ranges and/or frequencies have been programmed on the AUX7, the module can be installed by the follow-

ing procedure				outlined below. Refer to figure	3 for	module
location.
1.	Remove		all	interconnecting cables .
2.	Remove		the cabinet wraparound by removing		eight	screws on
	the	bottom		and sliding the wraparound toward the rear.
				NOTE:
		Perform steps 3 through 6 if the DR7 is			installed.
3. Unplug the 5 cable connectors connecting the DR7.
	Carefully		position these cables to the side.
4.	Unplug		the antenna coax and blue/white bandswitch stepping
	wire from the Filter module and remove the				rubber	grommet.
5.	Remove		the	DR7 hold-down screw and lockwasher.
6.	Carefully remove the DR7 by hooking the board puller under
	the	rear	edge and lifting upward. Once unplugged, the DR7
	can	be removed toward the rear of the TR7/R7.
7	Plug	the AUX7 into the proper connector. Be sure that all
	connetor pins arc aligned and that the board is fully seated
	in the chassis. Orient. the board so that the component side is
	toward the			rear.

NOTE:

Perform steps 8 through 11 if the DR7 has been removed.

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