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Recomend dual band VHF / UHF antenna for two radios
On Saturday, March 14, 2015 at 3:56:38 PM UTC-4, Jerry Stuckle wrote:
Tom, Please see inlined... On 3/14/2015 1:17 PM, Tom W3TDH wrote: May I ask that you cool your jets a little. Please turn off the afterburners and stick to the questions that I'm asking. I don't want to be a focus of a flame war. I came here in the hope of getting good information and the task of sorting out conflicting advice is so much easier if I don't need to also filter out gratuitous feuding. If you followed this group before posting (always a good idea), you will see that is pretty normal here. If you're going to post, you can expect both good and bad advice. And some people (like Channel Jumper - who probably isn't even a ham) are so far off with every post you can expect a flame war. But then that is true of almost every place on the Internet. Your version of what is possible is attractive because it allows me to do what I want to do to support my clubs D-STAR project and provide a training resource for the ARES Hospital Emergency Net staff to become competent with Winlink. I realize that there are some Hams that despise Winlink and all other automated store and forward systems. I will be doing everything I can to avoid interference to other Amateurs but since we are using this to support hospitals under emergency conditions I think that everyone can just suck it up and bare with the emergency traffic and whatever inconvenience it may generate. b You are required by law to avoid interference. But you also need to understand what constitutes emergency traffic to the FCC. For that to occur, there must be an IMMEDIATE threat to life and/or property. An example would be reporting an automobile accident, especially one requiring immediate medical attention. It does NOT include 99% of the traffic being passed during an emergency. In the 19 years I've been a member of MoCo ARES/RACES (including the Hospital Net), we have NEVER had emergency traffic passed during a callout. Of course, I could also say that of most of the emergencies I've been involved in in 47 years as a ham. The only times I can think of that I've been involved in true emergency traffic during a callout was when aiding search and rescue after tornadoes. Just because it's a hospital net does not constitute emergency traffic. So, while hams in the area will voluntarily yield the frequency, there is no requirement for them to do so, and any interference would be a violation. Would you please advise if the third harmonic issue is likely to be serious enough to require the use of a low pass filter between the two meter transceiver and the Diplexer/Band Pass Filter when using separate transmitters? Your diplexer should handle that well enough. What would be more of a concern to me would be just the spurious radiation around the shack. It's possible that could cause some desense, but I wouldn't expect it to be significant. -- Tom Horne W3TDH Your sig separator is broken. It needs to be exactly hyphen-hyphen-space-newline. You're missing the space. -- ================== Remove the "x" from my email address Jerry, AI0K ================== Jerry All I was trying to do by saying that we plan to be careful about interference is to calm and reassure those that are pathologically afraid of Winlink.. I do realize that nothing short of a true SOS like being pinned under a fallen snag with a widfire approaching qualifies as an emergency in the eyes of the Friendly Candy Company (FCC). They have been known to confiscate radios and cancel the license of hams who invaded a public safety channel to ask for help with a person who was bleeding profusely from a scalp wound. As a trained EMT I know that scalp wounds are often scarier than they look but how a ham out mountain biking with friends was supposed to know that I have no idea. The actual reaction of the FCC to any given situation is just as predictable as the reaction of any other organization that is staffed by human beings. Thanks for pointing out the the problem with my signature element. I appreciate the help. -- Tom Horne W3TDH |
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