ANAN-G2 Manual Page 27 of 35
5 Connecting Accessories
5.1 Linear Amplifier
5.1.1 PTT Out
Most modern Linear Amplifiers have a connection for keying the amplifier. The radio includes a back
panel 3.5mm jack connection for this purpose.
The PTT Out feature is best used to switch 25vdc and <1A. Exceeding these values may damage the
PTT output circuit.
How to test your PTT Linear Amplifier circuit BEFORE connecting your Apache Transceiver:
1. Power your Linear, connect the control cable to your linear but do not connect the other
end to your Apache Transceiver.
2. Using a DC Voltmeter, measure the voltage between the centre pin and the outer
connection of the cable. This must be less than 25vdc.
3. Connect a DC Ammeter between the centre pin and the exciter connection of the cable. This
should ACTIVATE the Linear Amplifier and give you a clear measurement of the current
requirements. The ANAN-G2 PTT circuit should not draw more than 1A.
4. If either of these values are out of the required range, then use an external keying interface.
There are many keying interfaces available from many sources such as MFJ, Elecraft, DX
Engineering.
Important: Connecting a Linear Amplifier that does not meet the above voltage and current
requirements is likely to cause damage to the Apache Transceiver linear switching transistor and
extreme cases, serious damage to other parts. Damage to the radio caused in this manner is not
covered by Warranty.
Linear Amplifier Keying ISOLATION adapters
http://www.dxengineering.com/search/product-line/kd9sv-products-sv-kr-keying-relays
http://www.ameritron.com/Product.php?productid=ARB-704
http://www.sultantronics.com/product.html
5.1.2 ALC
ANAN-G2 does not offer ALC control for an external amplifier. It is important to set the drive level so
that the amplifier is not driven into saturation. Drive shows a % of full power; setting the PA gain in
the setup form is the best way to achieve this.
5.1.3 Puresignal
To get Puresignal linearization your amplifier will need a coupler to take a sample of the TX signal
and provide it back to ANAN-G2. It should be just above 0dBm at normal operation. The signal
should be connected to the RX Bypass input connector. That input needs to be enabled on the
Antenna tab of your client SDR application.
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