Re: {Collins} 30L-1 ALC voltages ...

[Jerry Kessler <N4JL@xxxxxxx>]

John,

There is no need for an ALC connection to the 
30L-1 when using the FT-2000D.  But you must 
observe drive power, which should be targeted 
initially at about 65 watts.  The FT-2000D is 
capable of 200 watts output in its normal mode of 
operation.  Adjust power output to 65 watts with 
the Power Output control.  The radio is 
internally leveled  so  an over-driven condition 
should not result.  Make some on the air checks 
for signal quality or look for any distortion on a monitor scope.

Alternatively, the FT-2000D has a Class A mode 
for ultra-low distortion operation.  In that 
mode, power output is limited to 75 watts 
maximum.  So in that mode you should not have to 
worry with setting power below the max.  Again, 
make checks early-on in operation with the 30L-1 
to get an idea of how the combination of radio 
and amp is working.  Note that in Class A mode, 
the FT-2000D final amp transistors are drawing 
current all of the time.  Consequently, the radio 
will run warmer.  Given that we are moving into 
winter, the added warmth in the shack from Class A and 30L-1 may be welcome.

Finally, be aware that the FT-2000D amplifier 
switching is not rated for the open circuit 
voltage  on the 30L-1 key line (approximately 
-170 VAC).  Consequently, you will need a soft 
keying adapter in between the rig and the 
amp.  There are many alternatives for this 
adapter.  Build your own interposing relay 
circuit using a 12 VDC relay powered by the DC 
output jack on the radio and keyed by the TX GND 
jack.  If you find something on the order of a 
Yaesu FRB-757 amplifier interface, the 
interconnection is all plug-and-play with the 
radio and 30L-1 given the phono connectors all 
around.  If you prefer a commercial soft-key 
unit,  choose one with an Operate-Standby switch 
so that you can effectively take the 30L-1 
off-line without turning off the amp.  There is 
no standby condition on the 30L-1 but to either 
turn it off or disable the keying circuit.  An 
example of this type unit that is also 
plug-and-play, is the AmpKeyer by the Heathkit Shop.

I trust that you will really enjoy the combination of the Yaesu and the 30L-1.

73,

Jerry Kessler, N4JL



At 05:51 PM 11/22/2014, you wrote:
> I would like to use my Yaesu FT-2000D with my 
> newly acquired 30L-1 ... The required range on 
> the 2000D is below ... "The specified range for 
> ALC voltage to be used with the FT-2000D is 0 to 
> ­4 Volts DC." Will this work?  LLooks like a NO 
> CONNECT for the 30L-1 ALC cable! Tks John *** 
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