> Why, yes IMO the K3 clicks too much. Jim,
If you're experiencing clicks with your K3, you really need to investigate with a scope. At the risk of pontificating, every station should have a scope to monitor the transmit waveform. It can also be used to effectively monitor T/R sequencing times when using an external amp. I suspect many stations are hot-switching their amps and don't even know it until a T/R relay's contacts fuse and the relay fails. Cost is no longer an excuse. Anyone who can afford a K3 or FTdx5K can own a scope. Good quality used scopes can be purchased on the surplus market between USD $100-200. If I may make a plug for N8LP, he's got a forthcoming product that addresses my pontification nicely: http://www.telepostinc.com/LP-500.html Cost will be more than a used oscilloscope, but it looks like his product is concentrated on what we need for monitoring rather than general bench work. Design and cosmetics appear to be commensurate with the Elecraft K3. Paul, W9AC ----- Original Message ----- From: "Jan Erik Holm" <[email protected]> To: <[email protected]> Sent: Friday, December 03, 2010 10:18 AM Subject: Re: [Elecraft] Fwd: New Sherwood report Yes I do know that it´s not the rise/fall time alone, that has never been my point. However one factor is the rise/fall and if it´s too fast it will not be possible to fix it with shaping. Why, yes IMO the K3 clicks too much. I know it can be done since there are radios around that doesn´t click at all and at the same time the keying is "hard enough" for normal CW use. Sure you can´t key it to 500-600 lpm but thats not normal CW. / Jim SM2EKM ----------------- On 2010-12-03 16:00, Paul Christensen wrote: >> OK. AFAIK at 4 ms a CW TX will have to much > bandwith. Even the K3 at 5 ms (if it hasen´t changed > since I measured it) do have "mild clicks". > > It' not strictly the rise/fall time, it's the shape of the RF envelope > within the rise/fall time. > > http://www.w8ji.com/cw_bandwidth_described.htm > > Using the internal calibrator on my Tektronix SC504, I just measured the > K3 > rise time at 2.5 ms. I measure from the time the envelope just begins to > take off from zero until the point that full amplitude is reached. > Actually, full power on my K3 is not achieved for several more msec, but > the > dominant transition to the full power is measured at 2.5 ms. > >> I wish the K3 could be set to something like 7 or 8 ms. > > Why? > > Paul, W9AC > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
