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Author Topic: Icom Pro3 to FL2100z = Need ALC connection info'  (Read 1477 times)
M0BSZ
Member

Posts: 5




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« on: April 08, 2008, 11:37:21 PM »

Hi all,

I have a Icom Pro 3 and Yaesu FL2100z.

Relay buffer is an Ameritron ARB 704.

My question is:

What is the best policy regarding the ALC connection between the Tx and Amp.

1 - Is it needed.

2 - Is the Pro 3 and 2100z ALC connections compatible, or will I burn the shack down/damage radio, if I connect these !!

Any help appreciated.
Thanks
Alan
M0BSZ
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K6AER
Member

Posts: 5743




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« Reply #1 on: April 09, 2008, 10:52:13 AM »

If you connect the ALC from the FL-2100 you will find the ALC output is very aggressive with up to -9 VDC. This will shut of the transmitter in the Pro for about 4 seconds while the internal electrolytic discharges. If you want to use the ALC output you need to build a resistance divider out of a 5K pot.

Now for the good news. The power output of the Pro-III is very good with no overshoot upon key up and during use. Set the power out so as not to overdrive the little FL-2100 and you will be fine.

My Pro-III is very stable on the maximum output power settings. If I set it to 45 watts out there are no spikes in power output.
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