I have borrowed a Collins 30L-1 amplifier from a friend for CW SS, and have a question about tuning it up. When I tune the amp up according to the instructions, by setting the Load so that when I dip
I have (once again) become enamored with the idea of designing (and building, I hope) a solid state amplifier for 160 - 10 meter use. Ideally, this amplifier would deliver 1500 watts output in contes
As I mentioned in an earlier posting, I've been thinking about a 1500 watt HF solid state linear. It turns out that I am not alone - several fellow travellers are further down the road than I. While
Anyone care to opine on the minimum pcb trace width appropriate (i.e. safe) to carry 1500 watts between 1.8 and 30 Mhz into an impedance mismatch of less than 2.5:1? Assume 2 oz copper thickness. Alm
As you might have been able to guess from my posts in the last few weeks, I have been working on a project to design and build a 1500 watt solid state HF amplifier. My dream is not simply to build su
Suppose that I want an inductor of 5 mH that will handle 1500 watts into a 3:1 SWR from 1.8 to 30 Mhz (to build an L network antenna tuner, at the output of a solid state amplifier, say). 12 turns on
The PCB is roughly 6" x 13", double sided. We are going to have them made by ExpressPCB, a quality commercial fab house. The design uses relays and capacitors available from Digikey, and inductors th
As part of the requirement definition process for Project Gamma (our "Open Source" 1500 watt solid state amplifier project), we are trying to set a spec for worst case spurious emmissions (a link to
I'm trying to design a coil that will be used in a 1500 watt filter at HF. I know that I need to allow for frequency related skin effect that will reduce the area of the wire or tubing carrying the c
We looked at these FET's for Project Gamma. Cooling a 750 watt point source is a huge problem. We decided after discussion with APT's applications engineer (who is a ham) that we would be better off
As part of Project Gamma ( http://www.k6if.com/ssamp/ ), the team has done a bit of work to understand how to design high power inductors for use in 1500 watt output filters, antenna tuners and the l
Joe, Here in the US, 48 volt surplus telecom power supplies are available quite cheaply, on eBay for example. A 20 amp 48 volt "rectifier" as they call them, might cost less than $75 - perhaps as li
Cooling a 750 watt point source is a major problem. One is almost certainly better off (in a ham application) using several smaller parts (ARF463 e.g.) - which will require more circuitry but will a
The Project Gamma ( http://www.k6if.com/ssamp ) team is pleased to announce that the V2 output filter board has passed initial qualification testing with flying colors. This board is designed to prov
Protocase (http://www.protocase.com) appears to offer a turnkey cabinet manufacturing service that would be perfect for the price insensitive ham :-) For around $300, they will deliver a full custom
Well, I'm wouldn't say that RF Parts is as good a place as any if you care about price, and I don't know if they really match parts or just match lot numbers like CCI does. Richardson Electronics (ww
NB: I am hard at work (with many others) on a solid state amp that will be reasonably priced, very robust, and buildable by any ham who wants to own one - so I'm biased. That said, the big problem wi
For those of you who are interested in our project to build an "open source" solid state 1500 watt amplifier, a bunch of new pictures have been posted to http://www.k6if.com/Gallery1/ . There are now
Thanks Roger. Between the transistors and the copper heat spreader, we are currently using Arctic Silver 5, which appears to be the best high end PC overclocker oriented thermal material around. We b
Martin, Thanks very much for taking the time to write this detailed set of comments. We appreciate them, and will take them to heart as we continue with our project. As I'm sure you all know, the act