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I have access to a large industrial shear that I use to cut larger pieces of mostly .040 aluminum. For cutting on a table saw I like to sandwich the aluminum between pieces of scrap wood or plywood. A

Hello, Randy. I just so happen to have a copy of original. I will copy it, need to go to kinkos, and try to get it to you asap. Only need address to send to, compliments of the community. kf7yff,

That is a great tip James ! Jim WB4ILP

Hi, I am not mass producing anything here. I use Wiss aircraft snips that resemble extreme heavy-duty "scissors'. Scribe your cut lines and use reasonable care (required of for tools). 73, Bill KU8H

I use a table saw. If the metal is thin, sandwich it between a couple of plywood scraps.

Quadrature mixing to baseband is highly in vogue. The imprecision of the 90 degree mixing is corrected after a/d conversion by digital processing. I am thinking the kx2 does this. The qcx in contrast

Good evening, I just acquired in oak hills research dd-1 today unfortunately without the manual. Does anyone have a scanned copy that they could send me? Thanks, Randy.ab9go

I think I'll add one after the books done. We do have a firm contract now and a deadline of Jan 1. All but three of the 17 chapters are done. Hope all is well!! Jack, W8TEE

We use a compound saw to cut aluminium angle at the local Mens Shed. Provided you use a proper aluminium cutting blade, it does make nice neat cuts with very little touch up of the edges needed.

Until I bought my 8" brake/shear from Harbor Freight I cut aluminum and brass on my table saw and band saw all the time. No problem except I didn't use my best blades on the table saw, and I cleaned

I hope to get a shear soon but what about using a table saw, radial arm saw or bandsaw for sheet aluminum. I have all three of these in my shop. There are some videos on YouTube. Comments or

If I would have read the first line I would have known that it is for 40 meters. Oops

Nice job Jack, what band is it for and I am surprised that you don't have a frequency display

What I was interested in was that it contained both the DDS and the QSD. I do have Bob Macklin K5MYJ Seattle, Wa. "Real Radios Glow In The Dark"a couple of the QRP Labs SI-5351 modules and I am

I've built a few filter using SMD caps mostly 0802 and 0603 size with excellent results. The main advantage I found was the parts were typically 5% marked and tested closer. So the calculated values

Bob Maybe that's a bit high end for an HF application. That board may require a more expensive fpga board to control it. DDS was the rage in qrp for a while, now there are much cheaper silicon chips

Against that, they have less stray inductance because of the lack of component leads. Back in the days when SMD parts were shiny and new, their first widespread use was in UHF and microwave circuits

Thanks Mike, I have used them for LPF and BPF designs with no problems but wasn't sure about using them in Crystal filters. I also am using size 1206 caps and think I will give it a try and then sweep

Hi Joel, I prototyped crystal filters with through hole capacitors, then made the actual PCB with 1206 SMD parts. Seems to work just fine and reproduces the bandpass characteristics of the prototype.

Hi all, Just wondering how people feel about using SMD caps when building SSB/CW crystal filters as opposed to other types of caps. I have used them all, just curious. Joel N6ALT