Radio Shield RS-UVPA Rev: D Three band Power Amplifier

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1 Radio Shield RS-UVPA Rev: D Three band Power Amplifier Jim Veatch WA2EUJ 1 April 2016

2 TABLE OF CONTENTS 1. INTRODUCTION Specifications Operation INSTALLATION RS-UV3 Rev C and Rev D Hamshield... 7 Appendix A Schematics... 8

3 1. INTRODUCTION Congratulations on your purchase of a RS-UVPA Power Amplifier. The RS-UVPA is designed to interconnect mechanically and electrically with the HobbyPCB RS-UV3, three band, FM transceiver. It is also possible to use the RS-UVPA with other 144/220/440 transmitters or transceivers that provide up to 1 W output. The RX path has a low-noise pre amplifier that can be configured for low gain to overcome amplifier insertion loss or high gain which can improve the noise figure/sensitivity of low performance receivers. The RS-UVPA has control line outputs for each band, capable of keying an external amplifier for higher power operation. 1.1 Specifications Frequency Range (TX) MHz, MHz MHz; (RX) MHz Drive Level 200mW to 1W (may require attenuator adjustment over 0.5W) Output power 5W minimum on 144 and 220 bands; 4W minimum on 440 band Spurious Attenuation Greater than 53 dbc typically 60 dbc Antenna 50 ohms, SWR trip point: 3:1 RX Gain 2-3 db or db, jumper selectable RX Noise Figure 1.5 db maximum DC Power 8 to 15 VDC, 2 Amps maximum during TX < 50mA RX Size - 120mm L X 75mm W X 25mm H 1.2 Operation Once integrated with the transceiver, there is no impact on the operation of the transceiver. RS- UVPA operation is completely transparent, just like its part of the transceiver. The RS-UVPA does provide SWR protection which when tripped, will light the SWR LED and disable the power amp for the remainder of the transmission. Normal operation is resumed when the amplifier is unkeyed. DO NOT operate the RS-UVPA with the antenna directly connected to the PCB unless the RS- UVPA is mounted inside a shielded metal enclosure. Otherwise the RS-UVPA s PCB becomes part of the antenna system which can produce unexpected operation and/or damage to circuit components.

4 2. INSTALLATION This section describes the steps necessary to connect the RS-UVPA to the RS-UV3 and other transceivers. 2.1 RS-UV3 Rev C and Rev D If you are trying to connect the RS-UVPA to a RS-UV3 Rev B contact HobbyPCB Technical Support. Start by removing the power connector and the solder from solder jumper SJ1 as shown: The power connector interferes with the power connector on the amplifier and is redundant. The RS-UVPA will supply the RS-UV3 with power. The solder jumper sends the RF to the SMA jack which is bypassed when using the RS-UVPA. Technically the SMA could be removed but it doesn t interfere mechanically and it is VERY difficult to remove from the board. The solder jumper can be cleared and the power jack removed using solder wick. The next step is to add three headers to the RS-UV3; a 6 pin AMP header, a 2 pin PW header and a 2 pin PA header. Solder a single pin first the make sure the header is fully seated against the PCB and oriented perpendicular to the board before soldering the remaining pin(s). The following picture shows the header locations:

5 Once the headers are installed, it s time to mate the RS-UV3 and RS-UVPA boards. Make sure that the header pins on the radio align with the corresponding sockets on the amp. Put a jumper wire across the PWR-SW connections at this time. The RS-UVPA has a redundant set of PWR- SW contacts

6 The resulting board stack can be mounted in a suitable enclosure using the mounting holes in the PCBs or slide into extruded enclosures designed for 120mm X 75mm boards like a Hammond 1455K1201. HobbyPCB provides an enclosure available on our website. Here is the RS-UV3 and RS-UVPA mounted in a Hammond 1455K1201BK extrusion. The RS-UVPA is supplied with a small plastic cover on the SMA connector. Remove this cover from the SMA connector and place it over the unused SMA connector on the RS-UV3 to prevent (reduce) confusion when attaching the antenna.

7 2.2 Hamshield The RS-UVPA is designed to interface to the Hamshield and provide 5W output and provide a much needed improvement in receiver sensitivity, noise figure and filtering. As soon as we get our hands on one, we ll provide updated info.

8 Appendix A Schematics

9

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