I just picked up a Palstar LA-1K Amp and noticed on the waterfall all the noise it generates when powered on. pics are with amp on in standby attached to a dummy load. Anyone else running a LA-1K see this?
LA-1K ON
download/file.php?mode=view&id=2905
LA-1K OFF
download/file.php?mode=view&id=2904
Cal / N3CAL
Palstar LA-1K RFI
Palstar LA-1K RFI
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- LA-1K ON 1.png (2.21 MiB) Viewed 8861 times
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- LA-1K OFF.png (1.46 MiB) Viewed 8861 times
Last edited by N3CAL on Tue May 31, 2022 2:16 pm, edited 1 time in total.
Re: Palstar LA-1K RFI
Wow! That looks so bad it the amp must be broken somehow
Re: Palstar LA-1K RFI
My opinion. Looks like a filtration problem from your dc supply ( 50VDC @42A , switching power supply) .
André
VA2WR
André
VA2WR
Last edited by alemrush on Tue May 31, 2022 3:52 pm, edited 1 time in total.
André / VA2WR
Re: Palstar LA-1K RFI
I contacted Palstar and they refuse to do anything! They claim those signals are down more than -150db and would be a S1 signal which is no problem! With antenna attached I can hear those peak birdies and it's annoying!
Cal/N3CAL
Cal/N3CAL
Re: Palstar LA-1K RFI
Palstar needs to check it's math. The peaks are at -105, which is approx. S4. Those are big signals!
Re: Palstar LA-1K RFI
That is in NO way normal. I own an LA-1k and it's not even something I've ever noticed. Your amp likely has a broken power supply filter in it.
Re: Palstar LA-1K RFI
Wow indeed. That is horrendous and (the peaks) would be noticeable on any band except possibly 160M. Totally unacceptable - something wrong with the amp. Palstar needs to step-up and fix it.
Gary
K9RX
Gary
K9RX
Re: Palstar LA-1K RFI
N3CAL wrote:I just picked up a Palstar LA-1K Amp and noticed on the waterfall all the noise it generates when powered on. pics are with amp on in standby attached to a dummy load. Anyone else running a LA-1K see this?
LA-1K ON
download/file.php?mode=view&id=2905
LA-1K OFF
download/file.php?mode=view&id=2904
Cal / N3CAL
I’m going out on a limb here ... but I’m guessing you bought that used. Correct?
ANAN 7000 DLE MKIII
Thetis 2.10.3.6 x64 (1/28/24) dev_2
HP VICTUS (Gaming Laptop) - Intel Core i7 - 16GB memory - 512GB SSD - NVIDIA Graphics - WINDOWS 10
Best 73s,
WR4N - David
Thetis 2.10.3.6 x64 (1/28/24) dev_2
HP VICTUS (Gaming Laptop) - Intel Core i7 - 16GB memory - 512GB SSD - NVIDIA Graphics - WINDOWS 10
Best 73s,
WR4N - David
Re: Palstar LA-1K RFI
Hi David, the amp is brand new. I ordered direct from PALSTAR in January and received in late April 2022.
Cal / N3CAL
Cal / N3CAL
Re: Palstar LA-1K RFI
6/24/22 UPDATE: I shipped amp back to PALSTAR for warranty repair. They confirmed the RFI issue when using the amp on 120 V. (I currently don't have a 240V drop here in the shack so it's 120v only for now). Their fix was adding a ferrite core inside the internal 50V power supply. The internal ferrite fixed the problem! No more RFI! Turnaround was just under 3 weeks. They mentioned they were going to add the ferrite FB77-5621 core to all their production units now. Most of their testing is done on 240v so it wasn't noticed during production. The amp is back in the shack and running great!
Cal/N3CAL
Cal/N3CAL
Re: Palstar LA-1K RFI
Good news!