[TowerTalk] Acom 2K Arc Fault

[W1JCW John]

Have not had this issue before with this rig or another acom 2k with the 00 year amp at this setup I had to increase the delay time menu 068 sets cw qsk time,  
time delay between when the ptt is keyed and the carrier is transmitted default 15 ms. 

Yaesu 5K and no more arc fault. 

Increased time to 25ms and no more issue!! 

I don't understand why I had to do this as I have the same rig with this amp at another location and I never had this issue. 

Now I have a 12 year acom 2K which I'm sure has a newer T/R relay with no issue running the same rig with 15ms. 

Thank you everyone for your help. This was a very interesting issue and I hope these findings help others.  

73-
W1JCW
John

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Ed Stallman
Sent: Saturday, November 10, 2018 11:11 AM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Acom Arc Fault

Not saying this is the problem with the 2000a but if Acom used the brown or green Russian vacuum relay , I would change it to a Jennings or Kilovac . The vacuum relay supplied buy Acom lasted less then 3 months . 
Acom support was great! They had me a new Kilovac in less then a week and I was able to install myself . I can also see where a bad coax or antenna relay could give you a fault

Good Luck , Ed N5DG


On 11/10/2018 10:44 AM, Wilson Lamb wrote:
> Putting a dummy load out on a feedline does not mimic driving an antenna.
> And tuning in the shack only makes the amp happy.  It doesn't change what is going on outside.
> SWR due to line problems or mismatch at the antenna creates E and I peaks and nulls along the line that can find faults not apparent when everything is well matched.
> WL
>