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I am new owner. ?Using normal keying and RF sense to switch bands. ?If I have tribander for 10/15/20 m and multi and dipole fri 40/17/12 m. Sendings works on all bands but I cannot assign 12/17 m to to different antenna than 10/15m. ?I understand 10/12 m and 15/17 m share same harmonic filters, but you should be able assign different antennas for each band?

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is this just issue with RF detect select and I have to use a band cable?

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Thanks,

Brian?

KC4KK

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Are you talking about the HF Auto tuner? Because my LA-1K, bands can not be programmed for the two antenna ports. Antenna ports are switched manually on my LA-1K.

LA-1k

I think we are describing same behavior. ?Problem I have is 12 m is not available a separate band. ?It is combined with 10 m. ?So, I cannot have separate antenna for 10 and 12 m. ? ??????? Not good if only way is manual. ?

Well I am not sure why you can not have two antennas, one for 10 and one for 12 meters because I do.

I have an HF-Auto tuner in line.
Antenna port one has the coax for my 80/40 fan dipole connected to it.
Antenna port two has my Hy-Gain TH2MK3 20-10 M yagi connected to it.
Antenna port 3 has a remote coax switch connected to it which handles a 30 M dipole, 17 M raised vertical, 12 M delta loop and 6 meter yagi.

So if I want to operate on 12 M I use HF-AUTO port #2, put the remote coax switch on the relay that the 12 M loop is connected to on the remote switch mounted on the tower.

Key amp, amp goes to 12-10 meter settings and I am good to go.

My 3 HF rigs are all connected to a 4 position coax switch. From there the coax jumper goes to the amp input. Then from the amp Antenna 1 goes to the tuner.? I use Antenna 2 on the amp for my dummy load for testing purposes.

All of my HF rigs can key the amp by using a DX Engineering Dual Keyline.

So I am not sure why you can't have two separate antennas for 10 and 12 meters.

On Fri, Mar 21, 2025 at 12:54 PM, Brian Rehmer wrote:

I think we are describing same behavior. ?Problem I have is 12 m is not available a separate band. ?It is combined with 10 m. ?So, I cannot have separate antenna for 10 and 12 m. ? ??????? Not good if only way is manual. ?

Hi Brian, KC4KK, hopefully you didn't acquire your LA-1K brand new.? I paid just under USD $3,700.00 for the POS brand new in January 2023.

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In my 8-May-2023 post /g/la1k/message/1282 I described a serious LA-1K design shortcoming, in which Palstar puts three (3) Amateur Radio Bands all in the same icon in the "SELECT BAND" screen of their LA-1K.

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After reading my post, I'm quite sure you will see that the challenge I faced from day one applies to your situation too, and btw a band cable won't make a difference at all.

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73,
Ray
KJ5MI

You are selecting between the 10 and 12 m antennas with the Hf auto tuner. ?The La-1k goes to antenna tied to 10-12m.

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I got mine used and it is very nice. ?The amp works very well outside of the switch issue. ?

Brian
The amp antenna inputs can not be set up for different bands. There is no setting in the amp menu for that.
So I don't know what you are trying to do but you can not set the antenna inputs for different bands.

I clearly explained how my system works and it has worked flawlessly since I bought the amp over a year ago.

On Fri, Mar 21, 2025 at 04:18 PM, Brian Rehmer wrote:

I got mine used and it is very nice. ?The amp works very well outside of the switch issue. ?

Brian, KC4KK, glad to know you got your LA-1K used.? Thought I'd take this opportunity to share with you my 18-Oct-2023 post /g/la1k/message/1442 of numerous serious issues relative to the LA-1K for your situational awareness.

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73,
Ray
KJ5MI

Ray,

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I would really like to just discuss the antenna switch issue. ?

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Brian

Billy Parkinson
KG5RQZ
WRYA510
HH 11724
COR RACES 306

I can email you with regards to the antenna switch issue if you would like to discuss it further. If you want to email me my email is good on QRZ.
Rick VE3PP

You have been "discussing" for two years and it is getting really old.? Why haven't you sold it if you hate it so much?

For me, and my 6 antennas, it has been the best piece of equipment I have purchased.

On Fri, Mar 21, 2025 at 10:54 PM, Brian Rehmer wrote:

Ray,

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I would really like to just discuss the antenna switch issue. ?

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So, Brian, KC4KK, what are your thoughts on Billy, KG5RQZ, saying "The LA-1K is RF sensing to band changes, but not antenna changes."?? I can think of one scenario that isn't entirely true.

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73,
Ray
KJ5MI

Guys,

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On page 4 of the Users Manual under Additional Features,

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- Automatic band selection when transmitting.

- Automatic antenna selection of last antenna output when band selected

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Reading this?before I purchased the amp, I expected band=160, 80, 40, 20, 17, 15, 12, 10 and 6 m to be selectable. ?No 30m due to FCC power limit. ?

Using the amp now I see band buttons are 10-12 and 15-17. ?Note, band selects choose the power amplifier harmonic filter. ?This unfortunately seems to only allow seperate antenna selection for 17 and 15 or 12 and 10 m. ?

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On Sat, Mar 22, 2025 at 01:03 PM, Brian Rehmer wrote:

Using the amp now I see band buttons are 10-12 and 15-17.

Brian, KC4KK, are you sure that's correct?? My LA-1K, with firmware 1.08S, showing 12-10M and 20-15M on its "SELECT BAND" screen.

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Ray,

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you are right buttons are 20-15 and 10-12. ?And, got latest firmware 1.09e installed?

On Sat, Mar 22, 2025 at 07:05 PM, Brian Rehmer wrote:

And, got latest firmware 1.09e installed?

Brian, KC4KK, the Palstar official website is showing 1.08S as the latest firmware for the LA-1K.

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Did someone from Palstar advise you v1.09e is the latest LA-1K firmware?

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73,
Ray
KJ5MI

Yes, I talked to Mark at Palstar and he provided latest version. ?When I received the amp was built late 2023 it had 1.09b. ?

There was no change in behavior that I can see after update.