[ICOM] Icom 7000 power question

[Larry Young]

John: What you are describing is likely ALC overshoot. When the transmit power is reduced, usually by reducing the transmit IF gain when transmitting, the power amplifier still is capable of putting out full power if driven. There can be a delay before the ALC circuit reduces the IF gain, thus causing the overshoot spikes. Many rigs from other manufacturers are famous for having overshoot. As faster devices are developed the issue becomes somewhat lessened. A good Oscilloscope across a 50 Ohm output usually can reveal this. As to the extend of the IC 7000 exhibiting this characteristic and to what extent, I cannot say having no experience with that radio. BTW this effect is less noticible at the higher end of a radios band coverage and more noticeable at the lower band end where there is more system gain.
I hope this helps your understanding.
Larry K4LXV




________________________________
 From: John Geiger <af5cc at fidmail.com>
To: ICOM Reflector <icom at mailman.qth.net>; vhf at w6yx.stanford.edu; sidewindersontwo at yahoogroups.com 
Sent: Thursday, August 22, 2013 11:02 PM
Subject: [ICOM] Icom 7000 power question
 

I have a question about the Icom 7000 that hopefully someone can answer.  On the 706 series, if you turned the power back using the RF power control, the rigs would show a brief spike at full power when you first transmitted.  QST even verified this in their reviews.  Does the 7000 have the same problem?



73 John AF5CC
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