<DIV>Well I was thinking about it last night, and I remember at the time I was convinced that the problem was in part rf feedback, so I experimented with shielding different parts of the rig. </DIV> <DIV>To see if the mic wires or mic itself were picking up rf before I spent a lot of time shielding them, I remember disconnecting the wires from the mic and I'm not sure about this, but I think I remember that the problem remained. I guess this would leave microphonics of the circuit and physical disturbance of the unit?<BR></DIV> <DIV>Tom-N2YTF</DIV> <DIV><BR><B><I>"Stephen H. Smith" <wa8lmf2@aol.com></I></B> wrote:</DIV> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">hamaddict2001@yahoo.com wrote:<BR>> Al,<BR>> <BR>> Thanks for the response...that sounds feasible to me. Also if this is <BR>> the problem I think it will not be too hard to correct.<BR>> But why would the problem only
manifest itself on 70cm and not 2m as <BR>> well? <BR>> <BR>> Thanks again,<BR>> Tom-N2YTF<BR>><BR>> *//*<BR><BR>At UHF, the transmitter synthesizer VCO (Voltage Controlled Oscillator) <BR>is either running at the VHF frequency and then tripled, or the VCO is <BR>running directly at three times the frequency that it is on VHF. <BR><BR>In either case, any kind of electrical or mechanical disturbance <BR>(possibly the VCO tuned circuit is microphonic; i.e. sensitive to <BR>vibration or mechanical shock) is going to be three times as pronounced <BR>on UHF as it would be on VHF. <BR><BR><BR><BR><BR>--<BR><BR>Stephen H. Smith wa8lmf (at) aol.com<BR>EchoLink Node: 14400 [Think bottom of the 2M band]<BR>Home Page: http://wa8lmf.com --OR-- http://wa8lmf.net<BR><BR>NEW! World Digipeater Map<BR>http://wa8lmf.net/APRSmaps<BR><BR>JavAPRS Filter Port 14580 Guide<BR>http://wa8lmf.net/aprs/JAVaprsFilters.htm<BR><BR>"APRS 101" Explanation of APRS Path Selection &
Digipeating<BR>http://wa8lmf.net/DigiPaths<BR><BR>Updated "Rev H" APRS http://wa8lmf.net/aprs<BR>Symbols Set for UI-View,<BR>UIpoint and APRSplus:<BR><BR><BR><BR>_______________________________________________<BR>aprssig mailing list<BR>aprssig@lists.tapr.org<BR>https://lists.tapr.org/cgi-bin/mailman/listinfo/aprssig<BR></BLOCKQUOTE><BR><p>
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