Dressler VV INTERFACE - USED

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The DRESSLER Preamplifier Interface | VV-IRTERFACE

Allows remote switching and powering of pole-mounted preamplifiers via the coaxial power cable.

It also provides delayed switching via internal relay

for a power amplifier. |

The information for the transmit-receive switching can be provided

to the VW INTERFACE in two different modes:

from the push-to-talk (DTT) line of the transceiver

or via a positive switching signal taken from the

transceiver

In all cases, the VV INTERFACE connects to the system at the point closest to the antenna

in practice between the transceiver and the coaxial power cable or between the power amplifier and the coaxial cable. { The system configuration is shown in figures 3 and 4 for the cases without and with power amplifier}.

In receive mode, power is supplied to the preamplifier via the coaxial cable. In transmit, this power source is connected digitally via the internal circuitry.

DC power to the system is via the Phono connector at connector 1 (see figure 1).

The center pin is positive (+) and the shield negative (=).

The pole mounted preamplifier must have a supply voltage of at least 12 volts DC. This means that the supply to the VW interface must be greater than T2 Volts to allow for voltage drop in the coax cable. The actual safety margin depends on the cable resistance, typically a minimum of 1-2 volts per 25 meters of READ is expected. ar AG213/U

Transmit/receive switching can be done in two ways:

+ PTT

Using the phono connector 2 {figure 1 | connect the center pin to ground

to select the transmission mode,

{Connect the center pin to the shield = Cabinet = ground}

DC volts in PDM mode are available from the transceiver and can be fed to the center pin of the phono connector

Some Tame. {figure 1}.

{The negative of the oo switch connects to the shield

of the phono connector = ground}

When using a power amplifier, it is best that it is 14-25

after the PERNA LE can already be switched. This can

be possible if the amplifier has a separate Push-to-Talk input

r/t-wifi, using the phono contactor output

A" {figure 13}. The center connector is grounded

on the case approximately 0.8 seconds after switching the transceiver and preamplifier.

In case of accidental short circuit of the coaxial power cable, protection is provided by an internal fuse [0.7 A] located

on the printed circuit board. If no DC voltage appears on the

coaxial output connector (in Yecelve mode), check the

fuse. Access to the fuse is obtained by removing the 110

from the case.

—WARNING 1!!!

When applying continuous power to the VV interface, it is absolutely

It is vital that the transmitter (transceiver) is fully powered

when push-to-talk (PTT) connections have been made

to the YV interface. Otherwise, the RF power will destroy the

RF preamplifier transistor because the internal relays

will not be switched.

In this case there is no warranty. If the preamplifier does not work, disconnect the power from the VW interface on the phono connector 1 and leave the control lines [PTT or switching voltage].

TECHNICAL DATA

OPERATING FREQUENCY RANGE 100 → 500 MHA?

INSERTION LOSSES 0.5 dBs typ. max.

OPERATING VOLTAGE 12 ... 18 Volts max,

CURRENT at 0.3 Ampere

TRANSMISSION/RECEPTION SWITCHING STEP to ground or positive

SWITCHING VOLTAGE SWITCHING VOLTAGE LEVEL +6 + +12 Volts DC

RF CONNECTORS ti connector (or 507239)

FIGURE 1 W INTERFACE CONNECTORS

1 SUPPLY VOLTAGE

andL

DIT Vy. J interface

| { |

(top view) THE

6 FIER

30 COAXIAL POWER SUPPLY)

POSITIVE — .

SWITCHING. Ll =

RELAY OUTPUT

VOLTAGE ? FOR EXTERNAL AMPLIFIER |

M SOCKET FOR

TRANSMITTER OR PA

FIGURE 2 WIRING DIAGRAM

FIGURE 3

INTERFACE AND TRANSMITTER WIRING

DIET

PEE

PREAMPLIFIER

PTT E =

TRAISCENVER |—] | W INTERFACE | Ре;

| TR

J COAXIAL CABLE SWITCH

| TENSION

COAXIAL CABLE

FIGURE 4 "and

WIQIIS or TRANSMITTER - POWER AMPLIFIER = =

AND MY-PREAMP INTERFACE

POWER SUPPLY

PTT DR SWITCHING POWER SUPPLY

| | POKER AMPL, AND

| WW INTERFACE TRANSCEIVER

The

PTI to

§

|

PTT CONTROL TO PA

COAXIAL CABLE

Subject to change without notice.

MADE IN W-CERMANY BY

aresler

high frequency technology gmbh

WURSELENER STHASSE 7

C5180 STOLBERGAGERMANY

TEL 62402 51 22