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Re: Use with FT 8
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For several months I had many problems using FT-8 with my Palstar LA-1K, however when I changed my coaxial cable to a high quality cable, and better connectors the problems fade away. Nowadays I can work 10 to 40 Meters without problems. I no longer get kicked out to BYPASS. Currently I use a maximum of 600 watts without problems, when I can hear a DX station but they don't hear me. I use a cable developed for hot regions of the World, which is marked as a FT-8 cable( is white not black), and a solid connectors from the same company. Also, I use some coaxial cables heat suppressors at each end of every coax cable(from the same company). My LA-1K at FT-8 can really heat-up fast, but this suppressor works nice. On the other hand, when the LA-1K gets close to 65 degrees the internal fan kicks-in and helps to cool down it(noisy but helpful). Any way I keep an additional fan close to the amplifier air inlet. Finally, I test my coax cables with a VTVM meter for continuity, but also with my antenna tuner using a small 50 ohms resistor from Diamond Antenna, because? I found than even if got a good continuity with the VTVM, with the antenna tuner I could test for a solid cable-connector contact. With the tuner in one hand and the other extreme with the resistor attached to it I moved the end with the resistor in different directions and found that the SWR was constantly changing. Once I rechecked my soldering the SWR stayed absolutely solid. I use the Italian made cable, connector and heat suppressor from Messi & Paolini. However I bet that the other companies should probably have an equivalent cable and connectors. _____________________________ NOTA SOBRE CONFIDENCIALIDAD: Este mensaje y cualquier otro anejo que se incluya con el mismo es propiedad del remitente, y puede ser confidencial, así como estar protegido por la ley vigente. Su uso no autorizado, copiarlo o distribuirlo, está estrictamente prohibido. Si usted ha recibido este mensaje por? error por favor bórrelo, o destrúyalo, y déjeselo saber al remitente inmediatamente. Este mensaje está libre de virus, gusano o troyano cibernético. Sin embargo, es la responsabilidad de la? persona que lo reciba asegurarse de que así sea.? No seremos responsables de ninguna pérdida o da?o que ocurra como consecuencia de abrir o usar este mensaje.
En miércoles, 3 de mayo de 2023, 09:56:13 GMT-4, tuneupmagic (null) via groups.io <tuneupmagic@...> escribió:
What error messages popped up on the LA-1K when it kicked out? My experience doing SSB voice is that the amp’s protection schemes could be unnecessarily set on the conservative side. 73, Ray KJ5MI? On May 3, 2023, at 8:56 AM, Al - KD2PNR via groups.io <ahw609@...> wrote:
?I can't speak directly about FT-8, but I have tried to use my amp on other digital modes (using fldigi), and have experience a couple of different issues. For a long time it would keep kicking out into BYPASS for some unknown reason. The antenna is resonant, and I tried it straight, as well as through my HF-AUTO, and the same behaviour. Ultimately I discovered that if I set up the levels differently in the transceiver it would stop kicking out. I am only looking for about 100 watts, so I only drive it with 5W. Now that it has stopped that behaviour I can use it, but the temperature climbs like a rocket! Keep in mind that many of the other modes require longer continuous transmissions, and so after about a minute it is up over 50, and a 2 minute transmission puts it in the red (over 70). In the end I think this amp is not really suited to any digital work, and I now just go direct at 25W. Given I got this amp for some SSB use, and decidedly being able to run 100-200W in digital modes, I am disappointed. My expectation was that trying to run a 1KW amp at 100W would not be any strain on the amp at all. Good luck with FT-8, maybe with it's shorter transmission times it will work for you.
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