AMP TX delay setting for new LA-1K

  • 1
  • Question
  • Updated 2 months ago
I just took delivery on a new Palstar LA-1K amp.  I remember reading somewhere that HRO had some recommended TX delay settings and I thought I read it on this site.

Anyone remember seeing this thread or have any direction?

Rich
Photo of Rich McCabe

Rich McCabe

  • 1003 Posts
  • 215 Reply Likes

Posted 5 months ago

  • 1
Photo of Chuck

Chuck

  • 4 Posts
  • 0 Reply Likes
According the the LA-1K data, it has a vacuum relay, so it "should" have a switching time of about 8mS, perhaps 6mS.  To be sure, I would ask Palstar for the specific relay switching spec.  Once known, then set the TX Delay to that value.  In the interm, a delay of 10mS or a bit more should be safe.
---
Chuck
Photo of Rich McCabe

Rich McCabe

  • 1003 Posts
  • 215 Reply Likes

Thank you Chuck.   I think I will drop Paul a message.


Rich

Photo of Mike Presnell

Mike Presnell

  • 30 Posts
  • 8 Reply Likes
Rich, please post an update once you learn the answer.  Thanks!
Photo of Rich McCabe

Rich McCabe

  • 1003 Posts
  • 215 Reply Likes

I asked for some more clarification but this was his first response.


GM Rich
You can set the delay in your transceiver to
anything thats convenient as the LA-1K is
RF sensing and it will key the amp only after it reads
the freq of an RF carrier
Regards  Paul

Photo of N5BEG

N5BEG

  • 25 Posts
  • 6 Reply Likes
Thank you for the quick response. Looking forward to playing with it.  I should have said the HF-AUTO is behind the tuner. Its physically in front of the amp on the bench but electrically behind it. 
Photo of Neil   N4FN

Neil N4FN

  • 70 Posts
  • 11 Reply Likes
Rich,
You are saying that the relay is noisy on the amp? Mine is as quiet as can be.

Lee,
I am a bit confused as to the statement "I should have said the HF-AUTO is behind the tuner. Its physically in front of the amp on the bench but electrically behind it."
Is the HF-Auto the last thing in the line? Perhaps I should say the HF-Auto is just before the antenna?
Neil  N4FN    BTW I have both Palstar products and they are a great combo.
Photo of N5BEG

N5BEG

  • 25 Posts
  • 6 Reply Likes
Radio-Amp-Tuner-LP100A-Antenna. I tried to make it better and i made it worse....
Photo of Rich McCabe

Rich McCabe

  • 1003 Posts
  • 215 Reply Likes
Neil, my LA-1K is very noisy. Big heavy relay clunk. Fan is pretty noisy too. Amp works fantastic but I would consider it loud.
Photo of Neil   N4FN

Neil N4FN

  • 70 Posts
  • 11 Reply Likes
WOW, not my experience. I would call Palstar and speak with Paul or Mark his chief engineer
Photo of Neil   N4FN

Neil N4FN

  • 70 Posts
  • 11 Reply Likes
What made it worse??
Neil   N4FN
Photo of Gene - K3GC

Gene - K3GC

  • 206 Posts
  • 33 Reply Likes
I guess noise is a very subjective thing.  I consider the relay noise  from my LA-1K to be definitely loud  - I can hear it over my Radiosport head set which dampens most noise.

 The fan is also, to my ears, a bit loud.  However, the fan noise compared to other amps I have owned is relatively quiet.  It is a bit louder than my 6500 fans,

I would love to get both fan and relay quieter.

Photo of Neil   N4FN

Neil N4FN

  • 70 Posts
  • 11 Reply Likes
Hi Gene,
Not to beat a dead horse to death but out of curiosity I tuned my 6400 on different bands back and fort in an attempt to hear any relay noise, but heard nothing?? If you are hearing noise could it be from the tuner if you are using one. Perhaps a call to Paul at Palstar if there is a problem with the amp. I have found the service from them on a par with Flex which IMO is outstanding. I hope the issue is solved to your satisfaction
Photo of Rich McCabe

Rich McCabe

  • 1003 Posts
  • 215 Reply Likes
Well I can assure you my relay clicking is coming from the amp. As I said it works great but its a noisy amp in my case. I have no complaints with it except noise and the high SWR spike when you first switch bands.
Photo of Gene - K3GC

Gene - K3GC

  • 206 Posts
  • 33 Reply Likes
I think I will have to call Palstar.  Have any of you talked to them?  If so, please share.
Photo of Neil   N4FN

Neil N4FN

  • 70 Posts
  • 11 Reply Likes
You will find that Paul the owner of Palstar and Mark (I believe the chief engineer) are extremely responsive and helpful. As I have stated before their service is on a par with that from Flex and that is outstanding.
Neil  B4FN
Photo of Rich McCabe

Rich McCabe

  • 1003 Posts
  • 215 Reply Likes
I have not  called about how noisy it is.

They really don't send the amp with an acceptable manual so I am sure you will have to call them with questions anyway.
(Edited)
Photo of Gene - K3GC

Gene - K3GC

  • 206 Posts
  • 33 Reply Likes
I spoke with Mark at Palstar and the answer is both.
Older units (somewhat prior to April of this year )will be a bit noisy.  Later models will have shock mounted relays and will will be quieter.

He said the only way to tell for sure is to take the case off and determine if the relays (back right of the amp) are shock mounted.

So it is entirely reasonable, likely even, that there are loud amps and quiet amps.

I, for one, am not sufficiently motivated to tear my shack apart to find out :)


Photo of Rich McCabe

Rich McCabe

  • 1003 Posts
  • 215 Reply Likes
I might someday but not motivated either.  Mine was purchased 4/16 so coming up on 4 months old.