¿ªÔÆÌåÓýThe SWR in the RG-8X is likely very high, creating a high current or voltage point with potential breakdown.? If you must run 30¡¯ to the tuner I suggest 450 ohm open wire line. ? Al K5TAN ? From: [email protected] <[email protected]> On Behalf Of W4JDY1953_G via groups.io
Sent: Monday, February 17, 2025 5:48 PM To: [email protected] Subject: Re: [ldgelectronics] RT-100 OBSERVATION(S) AND QUESTION(S) ? It appears that the real component of your line impedance is changing with power output ¡ a little SWR change is understandable, but this cries for something either deteriorated on the line or its connects or a damaged coaxial cable, or a faulty connection. ? ? W4JDY / EM79xr / ITU 8 / CQ 5 ? ? From: [email protected] <[email protected]> On Behalf Of Dave Robinson via groups.io ? At the end of last year, I received an RT-100/RC-100 as a gift. I just finally installed it on my horizontal wire dipole about 170 feet in length. Feeding this wire with 30 feet of RG-8X. The tuner is connected to the shack via about 150 feet of LMR400DB. ? During the auto-tuning process, I see the SWR value rising and falling as I would expect while the RT-100 is finding a solution. During this process I see the SWR hitting very low values, well under 1.5:1. What is confusing is when a solution is finally "locked in", typically it will land at anywhere from 2:1 to 5:1 instead of the lowest point scanned. Then when I re-key the radio, the tuning process begins again. Now, in many cases, I have the radio set at 100W. The fold back due to SWR drops the power to the neighborhood of 20-40W until a tuning solution is achieved.? ? Using the ideal/proper tuning power of 10-30W, I can manually activate a re-tuning of the RT the tuner will find the lowest solution but when I resume the 100W setting, the tuner will often restart the tuning process. My solution for this is to turn off the power at the RC-100 so the tuner will remain at the solution. This somewhat removes the convenience of the auto-tuner idea for changing bands/frequencies. ? The question, is this normal operation for this tuner or should I look for some issue? I have used the tuner on my vertical antenna (GAP) and my horizontal wire (dipole) with the same functional results. ?
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