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Re: HI SWR at RF Input


 

Steve,?

Yes it is. I have a ftdx5000 and there is a setting in the radio (which many modern radios have) max output 200w, and i set it down to 50w as i feel thats a good safety measure for extra protection.?

I was in the cw contest this past weekend. Single band 15m. On this band i noticed i dont need much drive to get 900w out. 35w over drives it and kicks it out for me only on 15m. I feel better knowing its only 50 max that will kick it out instead of the full 200 if i ever tx everywhere else.

Interesting note. At the start of the contest, ?I was having a few end of tx bypasses amp kicking out and was getting annoying.?
I checked the back connectors and one was not very tight. In the summer, i disconnect that connector for lighting and i guess the last time i did it didnt go tight enough. After that, issue resolved.

I have put many contest hours into this amp in the past couple years. Its been a work horse for me and a solid performer. Excellent amp.?

Barry
Ve6um?




On Sat, Feb 18, 2023 at 17:47 Steve Snyder <w7cm@...> wrote:
I have mistakenly put 200 watts into my LA-1K several times. It just kicks out and gives the Overdrive message. The protection on this amp is very well done.

Steve W7CM

From:?[email protected]?<[email protected]> on behalf of Ron Emerson via??<wd8t=[email protected]>
Sent:?Saturday, February 18, 2023 4:07 PM
To:?[email protected]?<[email protected]>
Subject:?Re: [la1k] HI SWR at RF Input
?
The only input issues I have heard of happening with the LA1K resulted from overdriving the Amp with a 200 watt radio like the 101mp. I would contact Palstar on Monday morning and get their opinion.


Ron?
WD8T


Sent from Proton Mail mobile



-------- Original Message --------
On Feb 18, 2023, 11:55 AM, Jerry Leckness <?kd4xr@...> wrote:

This morning while transmitting on 3.965mhz I noticed a HI SWR warning on my FTDX101MP. At the same time, the LA-1K displayed SWR=1.0 and the HF-Auto SWR = 1.04. I have discovered that the LA-1K RF Input has HI SWR while in "Operate" mode. In "Standby" mode the RF input has normal antenna/Tuner SWR. The LA-1K will NOT amplify on 160, 80, 40 but WILL amplify on 20, 15, and 10. On 10m 10w results in 200w out. It appears something has happened to the LA-1K RF input. Any ideas what's going on???

73 Jerry
kd4xr

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