+If the filter response varies across the passband, which it does, the ALC +will vary the amount of gain used to try to keep the RF level to the amount +it is set at, whether the signal is being generated near the edge of the +passband or at the center. This is important to the PSK31 operator who does +not want to tune every signal to the center of the passband sweet spot +efore hitting TX in order to get maximum power out. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ I use the ALIGN function in MIXW or the similar functions in LOGGER or DM780 to set my rig to a tone of 1500 hz for both TX and RX. That way I can use the filters for receive and the same gain level for TX as I click on PSK31 stations in my band pass. I did this with my IC-746PRO for the same reason as any ham grade filters I have ever seen have gain variations with changes in frequency. Three DB may not seem like much in the bandpass of a filter but it is a lot in terms of the output of the transmitter. You set for fifty watts and clean and find one hundred watts and distortion.
I have been using ALIGN for four years and the gain / frequency problem has become a non issue. 73 Ken W0CZ _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
