Martin, I and others use the UDP broadcast packets from N1MM, HRD, and other loggers to drive antenna tuners and/or antenna tuner relays.
The logger reads the frequency from the rigs and broadcasts over local network (in my case, including Wi-Fi) using a standard UDP packet. The mode, transmit and receive frequencies of all rigs are available in the UDP packets and very easily parsed. Details here: http://n1mm.hamdocs.com/tiki-index.php?page=UDP+Broadcasts I have implemented UDP-controlled antenna switch relays using a Raspberry Pi 3 (about $40) but my preferred solution is much smaller and lightweight, the ESP8266 module (less than $10 and much smaller footprint). The Raspberry Pi 3 supports both wired ethernet and Wifi; the ESP8266 is wifi only. I have been using Wifi and prefer it because it decreases the cabling mess on my desk and at the tuners. Since switching over to UDP-controlled antenna switching last fall, I have made over 20,000 QSO's with the automatic switching and it has worked perfectly. I do contests like NA Sprint that have rapidfire band-changes so the system gets worked out a lot. Tim N3QE On Thu, Apr 6, 2017 at 9:51 AM, Martin <[email protected]> wrote: > Topbanders, > > i'm looking for advice on automatic antenna matching. > The goal is to automatically match a vertical for 160m and a loop for > 80/40/60/(30)m using motor-driven variable caps. > > We are using microham gear for station management, so we already have > information about tx-freq at hand. My understanding is microham uLink-Data > boxes translate data from many transceiver models to protocols a whole > bunch of matching units can deal with, be it ultrabeam or steppir or such. > > We plan to use a credit-card sized computer (raspberry) to drive a > motorized cap. The computer will set the cap to a pre-defined position, > based on stored information in a table (and probably switch inductance in > and out) . > > The protocol must be able to deal with large splits , e.g. USA calls above > 3.8Mhz and listens on about 3.6Mhz. > I cheked the radio outputs information about rx & tx - frequency and if it > is in split-mode or not. > > My question is: Has anyone on the list done this ,what protocol did he > use/like best and for what reason? > Is there anything i'm overlooking right now? > > > -- > > Ohne CW ist es nur CB.. > > 73, Martin DM4iM > _________________ > Topband Reflector Archives - http://www.contesting.com/_topband > _________________ Topband Reflector Archives - http://www.contesting.com/_topband
