RE: [digitalradio] Re: Too much power and courteous notifiication - how/if
I think it is a matter of signal cleanlinessuse the lowest power that allows the communication, with a clean signal. In PSK, as well as in SSB voice, and many digital modes with an envelope (I am not referring to constant envelope modes as RTTY) a clean signal is a must to conserve bandwidth. It is not a matter of power only. If you must make the contact, switch on your amplifier and run it at LOW POWER, that is, low enough to have a powerful but CLEAN signal with low IMD. Nevertheless, the audio from your TNC or soundcard shall never overload your transceiver input. Linearity shall be mantained from the signal source up to the antenna, no matter if you run milliwatts or full legal power. Happy QSOs, 73 de Jose, CO2JA __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com The K3UK DIGITAL MODES SPOTTING CLUSTER AT telnet://208.15.25.196/ More info at http:///www.obriensweb.com Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [digitalradio] Re: Too much power and courteous notifiication - how/if
--- Jerry [EMAIL PROTECTED] wrote: Operating at my station more than 25 watts the RFI gets back into my computer and locks it up. I have no choice, as my antenna is indoors, can not put any antenna outside, or fear eviction. I am eight floors above the ground, no balcony so have to do the best I can do with 15 to 20 watts. I had that problem with my keyboard years ago, and I substituted the cord with a shielded one, and added extra power filtering to the 5 V line inside the keyboard, with three ceramic caps (1 nF + 10 nF + 100 nF) in parallel to ground and a VK??? RF choke in series. With the keyboard unplugged, I had no RFI. It was one of those aluminum foil shield cables...using a copper braid shielded cable as substitute it is inmune to RFI. 73 de Jose, CO2JA __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com The K3UK DIGITAL MODES SPOTTING CLUSTER AT telnet://208.15.25.196/ More info at http:///www.obriensweb.com Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
