The Yauesu data cable for the Ameritron AL-1306 works perfectly with my 101D. AMERITRON DB-DB15Y




Ron?
WD8T


Sent from Proton Mail mobile

Bill,
I searched the Palstar website and don't find this band data cable.? Where did you get yours from?
I have a FT-991A and LA-1K and this would be nice to have.
--
Glen, WB4KTF, Austin, TX
Licensed since 1968

Good news to share: ?My LA – 1K amplifier was sending no power out and was not band switching as it had previously done successfully for months.

I replaced the Palstar LA-1K to yaesu band data radio interface cable, and my LA-1K amplifier is again fully functional.?

Bill AG5ZN

Steven N7NF
Did you find the power problem?
This same issue has occurred with my Palstar LA-1K (which was working perfectly).
Bill AG5ZN

On Thu, Dec 7, 2023 at 08:46 AM, tuneupmagic (null) wrote:

Still, Kent, please kindly address the question I raised in my post yesterday /g/la1k/message/1474 as to you stating that?"Above 33 amps and the amplifier shuts down."

Is that "33 amps" alternating current (AC) or direct current (DC), sir?

Hey Kent K9ZTV,

My bad.? If I had read the 4-Dec-2023 post /g/la1k/message/1469 by Claus (AE0S) all the way to end of his post, I wouldn't have wasted your time yesterday asking you the question: Is that "33 amps" alternating current (AC) or direct current (DC), sir?

So, Kent, please read the sentence just before the final sentence in Claus' post /g/la1k/message/1469 I am sure you can figure out for yourself the correct answer to my rhetorical question, sir.

73
Ray
KJ5MI

Kent K9ZTV, so sorry in my post yesterday /g/la1k/message/1474 I neglected to address the first two (2) sentences of your post, stating that "The 33 amp statement applies only to the maximum current rating when using the amp on 120 VAC.? That's not its nominal draw, that is the maximum that the amp can tolerate."

With your two sentences (above) taken in context... If you were referring to the inrush current of the LA-1K power supply in question, during the initial power-up sequences of the LA-1K amplifier, I'd think you are close to being accurate in your assessment.

Still, Kent, please kindly address the question I raised in my post yesterday /g/la1k/message/1474 as to you stating that?"Above 33 amps and the amplifier shuts down."

Is that "33 amps" alternating current (AC) or direct current (DC), sir?

73
Ray
KJ5MI
PS - Hey, that isn't a trick question at all, sir, you have a fifty-fifty chance of answering it correctly.

On Tue, Dec 5, 2023 at 05:07 PM, Kent Trimble, K9ZTV wrote:

The 33 amp statement applies only to the maximum current rating when using the amp on 120 VAC.? That's not its nominal draw, that is the maximum that the amp can tolerate.? Above 33 amps and the amplifier shuts down.? Taken from page 8 of the online manual in the LA-1K section:

So glad to see that you have responded as to the identity of the manual in question, Kent.

1.? To be accurate, the "33 amp" information you referenced in the online manual is located on page 15, not page 8!? "OTHER MENU OPTIONS" is the heading of page 8.

2.? You stated "Above 33 amps and the amplifier shuts down."? Is that "33 amps" alternating current (AC) or direct current (DC), sir?

Btw when I asked Mark Ward of Palstar to provide me with a copy of the data sheet (i.e. OEM marketing material) for the power supply currently being installed in the production units of the LA-1K, Mr. Ward advised me in writing that Mr. Paul Hrivnak (chief engineer, president and CEO of Palstar) stating that "no information will be provided on the P/S type and specs sheet."

73
Ray
KJ5MI

开云体育

The 33 amp statement applies only to the maximum current rating when using the amp on 120 VAC.? That's not its nominal draw, that is the maximum that the amp can tolerate.? Above 33 amps and the amplifier shuts down.? Taken from page 8 of the online manual in the LA-1K section:
?


As I said earlier, the rule-of-thumb for long-term viability of solid state amps is:? if the supply voltage is 120 VAC, one should limit RF output to 500 watts; if the supply voltage is 240 VAC, one can run a 1000-watt rated amp at 1000 watts RF output.

End of my end of the discussion.

73,
Kent
K9ZTV

开云体育

The 33 amp statement applies only to the maximum current rating when using the amp on 120 VAC.? That's not its nominal draw, that is the maximum that the amp can tolerate.? Above 33 amps and the amplifier shuts down.? Taken from page 8 of the online manual in the LA-1K section:
?


As I said earlier, the rule of thump for long-term viability of solid state amps is:? if the supply voltage is 120 VAC, one should limit RF output to 500 watts; if the supply voltage is 240 VAC, one can run a 1000-watt rated amp at 1000 watts RF output.

End of my end of the discussion.

73,
Kent
K9ZTV

On Mon, Dec 4, 2023 at 06:11 PM, VE3PP wrote:

I was assured by the Palstar Tech rep that the amp does not draw anywhere close to 33 amps on 120 V.

Rick VE3PP,

Have you brought Kent's insights /g/la1k/message/1467 about the LA-1K power supply to Mr. Mark Ward's attention at Palstar?

73
Ray
KJ5MI

On Mon, Dec 4, 2023 at 07:46 PM, Claus (AE0S) wrote:

In the manual the specifications states: "AC POWER 100-125VAC @ 15A or 200-250VAC @ 10A".

Claus,

Please be advised the currently available LA-1K Technical Manual doesn't apply to LA-1K?with a serial number (S/N) higher than 37055 in terms of the installed power supply.? My LA-1K has S/N 38935.

As stated in my 30-Mar-2023 post /g/la1k/message/1152 "Mr. Ward advised me to ignore the power supply information in whole, as printed on Page 15 of the technical manual (hard copy) that came with my LA-1K shipment, since Palstar failed to update their LA-1K technical manual."

Palstar still hasn't updated their LA-1K Technical Manual as of this writing.? As such, if you are quoting information taken from the currently available LA-1K Technical Manual, said information is irrelevant for the power supply installed in my LA-1K as well as those currently in production.

73
Ray
KJ5MI

Thanks to being licensed we know:
P = U * I

so
120V * 15A = 1,800W
240V * 10A = 2,400W

We remember that legal limit is 1,500W, although the LA-1K should only be run up to 1,000W.
Some power goes out in heat.? Maybe 200W? [shrug]

In the manual the specifications states: "AC POWER 100-125VAC @ 15A or 200-250VAC @ 10A".

With all this information, that you as a technician operator have, you can be assured that a 15A circuit on 120V is fine.? The trouble is we extras have taken the technician exam so long ago we forgot the basic formulas.

The mysterious 33A is in a section of the manual where also the LA-1K 50V Vd is mentioned.? Hey, since we are technician we quickly realize that 50V * 33A = 1,650W.? This section is talking about the amplifier shutting down when this current exceeds 33A (i.e. we're taking the amp to it's limit). It seems reasonable when maxing out the amp that 1,000W (or more) goes to RF and a hole bunch of additional power is used to generate heat.? We can conclude that this is not the current on your outlet!? I do agree this section is not written clearly and can be confusing at first.

73,
? Claus (AE0S)

I was assured by the Palstar Tech rep that the amp does not draw anywhere close to 33 amps on 120 V. The sticker on the back of the amp under the power cord states 20 amps and I was told it would not draw that either.

On Thu, Nov 23, 2023 at 02:19 PM, Kent Trimble, K9ZTV wrote:

According to the manual, at 120 VAC the maximum current draw for the LA-1K is 33 amps.

Hey Kent,

Thought I'd follow up with you after getting no response to my posts /g/la1k/message/1460 and /g/la1k/message/1461 regarding your insights on the LA-1K power supply.

Please kindly identify the manual in question, that prompted you to state "According to the manual, at 120 VAC the maximum current draw for the LA-1K is 33 amps."

73
Ray
KJ5MI

On Sun, Nov 26, 2023 at 03:22 PM, Bill K3HZP wrote:

If the input level required by the ICOM transceiver is +10dBm (10mW), DPM could be provided to the LA1K by the ICOM transceiver.

This pre-release information makes claim that "The IC-PW2 has succeeded in realizing the world’s first DPD as a linear amplifier for amateur radio in combination with the IC-7610."

Being the "world's first" sure makes it sounds like said ICOM DPD isn't exactly identical to the PureSignal approach that has been around for years.

This ICOM page has a nice clear pic of their DPD feedback cable providing the needed connection between the IC-7610 and IC-PW2.

Perhaps, owners of PureSignal-equipped LA-1K with IC-7610 (new DPD firmware installed) as the exciter can share their findings with the rest of us.

73
Ray
KJ5MI

The part of the Digital Pre-Distortion system in the amplifier is only a RF sampler (or attenuator) that provides a very small feedback signal from the amp to the transceiver. All the DPD work appears to be performed in the transmitter. If the input level required by the ICOM transceiver is +10dBm (10mW), DPM could be provided to the LA1K by the ICOM transceiver. DPD appears to be a very slow feedback system that learns the corrections, rather than provides an immediate correction like a normal feedback system. This keeps the feedback system stable because of the long delays inside of the feedback loop would cause instabilities.

Maybe this provides some insight.
73
.... Bill K3HZP

The Palstar LA-1K incorporates a rear (RCA jack) labeled, and included in the instruction manual, as::
? P U R E S I G N A L : S a m p l e @ + 1 0 d B m @ 1 k W o u p u t ( R e a r P a n e l )

I don't recall any information in the Instruction Manual as to the exact setup or operation of this output, although I suppose the above label is reasonably descriptive.

"Pure Signal" has been around for some time, with limited application.? I had assumed it was based on an open standard that could be applied across equipment from various manufacturers.? Of course, there is no reason any one amateur radio supplier would find it desirable to use it, versus their own proprietary method.? One only needs to suffer with D-Star, System Fusion, and DMR to see that!!

So I guess the question would be:? Does the ICOM Pre-Distortion feature follow the Pure Signal standard, and it not, can they be made to play together?

On Sat, Nov 25, 2023 at 11:24 AM, Thomas NE7X wrote:

I am using an ICOM IC-7610 transceiver and ICOM has released a software update to provide DPD (Digital Per-Distortion) in addressing non-linearity in RF power amplifiers.

Hi Thomas,

Looking at this ICOM page it sure sounds like the DPD thing applies solely to their IC-PW2 amp when paired with their IC-7610 transceiver.? As such, it's doubtful ICOM would share its proprietary technology with Palstar to enhance LA-1K compatibility with the IC-7610 transceiver.

73
Ray
KJ5MI

I am using an ICOM IC-7610 transceiver and ICOM has released a software update to provide DPD (Digital Per-Distortion) in addressing non-linearity in RF power amplifiers.

Is this something which needs addressing with the Palstar LA-1K ?

Thomas NE7X...

Digital Pre-Distortion (DPD)?is a technique to increase linearity or compensate for non-linearity in power amplifiers.??are critical in communication systems and it is crucial to improve their efficiency and overall performance. DPD is a cost-effective linearization technique which aims to provide improved linearity, better efficiency, and take full advantage of power amplifiers.

Digital Pre-Distortion applies inverse distortion, using a pre-distorter, at the input signal of the PA to cancel the distortion generated by the power amplifier. This requires knowing the PA characteristics accurately with effective implementation for successful DPD functioning. Proper implementation can show improvements of up to 40% in PA efficiency used in wireless base stations.

On Thu, Nov 23, 2023 at 06:38 PM, tuneupmagic (null) wrote:

Please note that page 15 of the currently available LA-1K Technical Manual makes absolutely no mention of the magnitude of the AC input current associated with either 120VAC or 240VAC input voltage of the medical grade power supply.

Your thoughts?

Kent, K9ZT,

Were you referring to another version of the LA-1K manual from Palstar that has been revised to include specifications of the power supply installed in the LA-1K amps that are currently being manufactured, when stating "According to the manual, at 120 VAC the maximum current draw for the LA-1K is 33 amps." in your 23-Nov-2023 post?

If that's the case, how would one get a copy of that revised manual?

73
Ray
KJ5MI