[Amps] ALPHA 89

[Robert]

Brad,   Thanks,

 

I did open up the input circuit area of the alpha and clean contacts on band
switch.  Everything "Looks" brand new.

didn't go any further.   will try the six foot length..

 

73 W5AJ

 

 

Robert

Midland, Texas

 

From: BRADLEY FOCKEN [mailto:bfocken at msn.com] 
Sent: Saturday, March 14, 2020 5:52 PM
To: Amps at contesting.com; Robert <woodr90 at gmail.com>
Subject: Re: [Amps] ALPHA 89

 

Hello Robert,

The 89 was set up using a 6 foot length of RG58.

Try that and see what you get then it should be below 1.5. I would not
recommend messing with the tuned input as it will cause the next person a
similar problem.

73

Brad K0HM

Get Outlook for Android <https://aka.ms/ghei36> 

 

  _____  

From: Amps <amps-bounces at contesting.com <mailto:amps-bounces at contesting.com>
> on behalf of Robert <woodr90 at gmail.com <mailto:woodr90 at gmail.com> >
Sent: Saturday, March 14, 2020 4:32:47 PM
To: Amps at contesting.com <mailto:Amps at contesting.com>  <Amps at contesting.com
<mailto:Amps at contesting.com> >
Subject: [Amps] ALPHA 89 

 



I have Alpha 89 on test bench, it's an amp I've used for several years and
decided to sell.

 

On 40 meters the Alpha input SWR, using the Alpha LEDs about 1.2 to 1 

The K3 reads 2.9 to 1 

An outboard MFJ meter shows 2.5 

 

I've tried different coax jumpers, lengths, etc.

SWR improves (2.9 best) as increase Alpha to 1500 Watts output but at ten
watt "Test" output of K3, the SWR indicates on K3 near 15 to 1

 

Bands outside 40/80 are fine.   80 is more 2 to 1 input, other bands, 1.1 to
1.

 

Thoughts??

 

73 W5AJ

 

Robert

Midland, Texas

 

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