David, The preamp has a fairly steep roll off before the 160 meter band. During beta testing, we found using the preamp on 160 actually made reception worse. This is why you can not select the preamp for 160 meters. Gerald can give you a better technical answer than I on exactly what the characteristics of the preamp are.
-Tim ---- -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of David Cole Sent: Saturday, November 03, 2007 4:59 PM To: flexradio@flex-radio.biz Subject: [Flexradio] 160 preamp 160 Receive Pre-amp - I wish to have the option to switch the receive pre-amp on on 160 at the moment this is grayed out. There is a big difference in receiving low signals if the pre-amp is enabled. The noise floor using 250mtr beverages is -100dbm 2.001khz without the pre-amp. With the pre-amp enabled this drops to -112dbm. Very low signals which are totaly unreadable become Q5 and workable - I have made the same tests on 80m and the results are the same. Has anyone else experienced this situation? if so is there a fix? how easy is it to change the software? - Dudley I have also emailed you directly on this ongoing problem. G3RCQ -------------- next part -------------- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20071103/319589ec/attachment.html _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/ _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
