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Author Topic: Ameritron AL-811 to Yaesu FT-757GXII  (Read 1448 times)
NK8T
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Posts: 6




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« on: October 22, 2004, 06:34:55 AM »

I am looking to connect my Yaesu FT-757GXII to an Ameritron AL-811 amp.  The Yaesu manual lists 2 diffrent ways to connect them. One by connecting it as A Linear with the RY of the amp connect to the PTT jack on the x-ceiver.  The other is for a QSK linear connecting the amp to the x-ceiver via the 8 pin band data jack.  Thanks for any suggestions.
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W7DJM
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Posts: 1




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« Reply #1 on: October 22, 2004, 08:49:22 AM »

You ABSOLUTELY do NOT want to hook up a linear to that radio without a relay.  Seems to me "the book"  (I don't have one anymore) actually shows the diagram for the relay?

If you don't feel comfortable building one, I would think Ameritron makes it.

You can also key a LIGHT duty relay with what is outputted to the rear, and a series diode.  I don't remember anymore which connectors, seems to me that +12 is available back there goes to one end of the relay coil, in series with the diode, and the other end of the string goes to one of the other rca jacks, I do NOT remember the labeling??

Seems to me one becomes  grounded when the radio tx's,  one  is for such as a foot switch, and one outputs 8v on tx??
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W9GB
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Posts: 2650




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« Reply #2 on: October 24, 2004, 05:04:06 PM »

Here is a plug-and-play solution for you
http://www.theheathkitshop.com/ampkeyer.html

Yaesu did make an external relay box for your FT-757GXII ... when used with amplifiers - like the AL-811 .. used ones appear on eBay.

Ameritron will have an external unit -- if you do not have building skills.

w9gb
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W9GB
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« Reply #3 on: October 24, 2004, 05:09:07 PM »

The Yaesu accessory that you need for your Ameritron AL-811 amplifier keying is the Yaesu FRB-757 (that should be listed in your Yaesu manual)

The Ameritron part is an Amplifier Interface Buffer - ARB-704:
http://www.ameritron.com/ameritron/products.php?prodid=ARB-704

w9gb
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W9GB
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Posts: 2650




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« Reply #4 on: October 24, 2004, 05:12:19 PM »

So, you just need to decide which interface (Yaesu, Ameritron, AmpKeyer, homebuilt) that you want.

Ameritron tells you this on their web site (about their amplifiers - including the AL-811)

Why you need the ARB-704?

Amplifiers can damage radios if the amplifier has too much relay control voltage, voltage spikes, or excessive current on the relay control line. Such damage often appears as "stuck" or "sticky" transmit relays in exciters or shorted transistors on transmit control lines. In most cases where the radio is damaged, the system transmits normally but the external amplifier stays locked in a "transmit" mode. This prevents receive signals from coming through the amplifier with normal levels whenever the amplifier is in the "ON" or "OPERATE" position.

The ARB-704 has many electrical advantages over conventional relay buffer systems. The ARB-704 has no moving parts, switches almost instantaneously. It is noiseless, has very long life, and will not develop dirty contacts. It operates with negative, AC, or positive amplifier relay control lines.

It works with any relay voltage (AC, positive or negative) up to 200 peak volts and any relay current up to 300 mA. The ARB-704 is fully compatible with conventional amplifier relay systems. It is especially suited for buffering vacuum relay QSK amplifiers, since the ARB-704 does not affect attack or release times in a deleterious manner.

The ARB-704 operates with transmitters or transceivers that pull amplifier control lines to ground, or output a wide range of positive or negative control voltages. The transmitter only switches currents under .35 milliamperes and very low voltages when using the ARB-704. Measures a super compact 4-1/4W x 1-3/4H x 2-1/4D inches

The ARB-704 is supplied with the following:
1. One power connector cord and plug with red wire (+12 Volts) and black wire (- and ground).
2. Three phono (RCA) cord with connectors on each end. These cables are for relay, ALC and amplifier control lines
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