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Re: Keying Relay Buffer Debate


 

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Interesting that there is an admission that these amps are going into bypass mode like this. I have spoken to Mark about ?it and he says his amp never does that. Others who own their amps say theirs have never done it either. And as far as the dummy load goes, it even does it into a dummy load. I was told to send my amp back in for repair as it shouldnt be doing this. These amps should never go into bypass mode when Operating within the specs. Eg not overdriving and not having some sort of antenna or cable short. Whos right and whos wrong here? I just finished the iaru contest and on every band, using seperare antennas i had the amp 200- 800 watts out And had it swr bypassing on all bands 10-160m. When it bypasses it makes me look like a bad operator during a contact and could sacrifice a multiplier. 99% of the time its fine. Its the 1% drives me nuts. Im actually worried about sending it back for repair as if thats the way these amps are would be a waste of shipping costs as the next one wont be any better.

Another thing i noticed with the amp is if i was on 10m cw about 2khz or closer to 28.000mhz i would get instant bypass. Is that some sort of protection so cbers dont use this amp for 11m band. So much im learning here in the forums but not sure whats true and what isnt.?

Palstar has never said or admitted to me this issue and that a solution is in the works.?
?All they said is it shouldnt be doing this.

Bp


On Jul 11, 2020, at 11:42 PM, Kent Trimble, K9ZTV <k9ztv@...> wrote:

? I am in total agreement with that statement and said as much to Palstar that perhaps the protection circuits were too protective for the real world of antennas.? I also said I didn't spend $3600 to laud how well the LA-1K performed into a dummy load.

I'm confident that this will get fixed.? Palstar is a good company.? These LDMOS amps just need further refinement.

When it does, I'll focus my energy on the SPE Expert 1.5K-FA which has the exact same problem.

73,

Kent? K9ZTV



On 7/11/2020 11:58 PM, davenlr@... wrote:
If the output devices in the LA-1K are rated for 64:1 SWR per their spec sheet, why does the LA-1K not allow at least a 3:1 SWR before faulting?? It could easily back the power off between 1.5:1 and 3:1 before going into fault.? ?It seems all SS amps are overly cautious with SWR.

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