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PA-1000 biasing current changes with time

Hello forum members, My wonderful PA-1000 developed a fault which manifested itself in "flat-topping" (audio) distortion and output power variation during operation in SSB. It has been in operation for just under 2 years. Mostly SSB and some CW at Pmax = 400W (VK legal limit). I then check...
by VK3FFB
12 Dec 2020 23:52
 
Forum: Juma Discussion
Topic: PA-1000 biasing current changes with time
Replies: 0
Views: 276

Re: Juma PA1000

Hello Ryan apparently, I did not get an e-mail when you replied to my post. Thanks for your response & the link. Meanwhile, I got used to the 9 o'clock position of my RF output power control knob. I only touch it when I switch between SSB and CW because on CW I usually stick to 200W. It's a diff...
by VK3FFB
08 May 2019 23:46
 
Forum: Juma Discussion
Topic: Juma PA1000
Replies: 4
Views: 3978

Juma PA1000

Hi I am a new owner of a PA1000 HF linear amplifier. I did not see a dedicated PA1000 topic here, so I created this one. I am quite happy with the PA1000. So far I used it on 20m and 40m in SSB and CW. I find it easy to use and it performs very well. My rig is an ICOM 756 Pro III. Given that the PA1...
by VK3FFB
12 Feb 2019 00:14
 
Forum: Juma Discussion
Topic: Juma PA1000
Replies: 4
Views: 3978

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