Hi Mike, Thanks for the reply. My current plan is to drive the stepper controllers with an onboard processor. That processor may or may not talk to a PC, but I want it to be able to run stand-alone f
I made a side-thread for this since it isn't directly related: This discussion of "super semis" makes me wonder if anyone is still engaged in vacuum tube research these days. Could any of the basic t
Has anyone tried a thin application of Caig DeoxIT grease (not liquid) on roller inductor conductors? I mean applying a trace to the inductor conductor itself, not the supports or other dielectric su
With some patience and extrapolation you *might* be able to divine the number of turns from this: http://www.rfconcepts.com/ETO-Alpha-PA-77-160m-Addition I'll apologize for not opening mine; one of t
Small Parts sells it in different thicknesses in that size: http://www.smallparts.com/small-parts-silicone-rubber-sheet/dp/B003SLF0C6/ref=sr_1_3?sr=1-3&qid=1313950067 73, Jim, N7CXI _________________
... resend, original didn't reflect for whatever reason. If you were looking at a Dahl plate transformer removed from a BC transmitter that had a center-tapped secondary, would you bet that the insul
Thanks for all the replies. "Looking at" was a poor choice of words on my part. I saw the transformer advertised in an internet ad, so I don't have access to it for any hands-on testing. Since the as
That being the case, would they then serve as good replacements for the pair of 150-ohm carbon comps in each of the parasitic suppressors in my Henry 3KA? (2x 3-500Z) It's developed some minor instab
Funny you bring that up, Jim. Bob, if you're tracking this and happen to have a mic that will plug into the balanced mic input on the 5000A, it would be interesting to know if that has any effect on
Sure, but assuming the balanced input of the Flex/mic/cable combo doesn't have formal a pin one problem to start with, then shouldn't it be more resistant to common-mode RF than the unbalanced front-
I have a 76A that does this once in a while as well. If there's a known cause, please post to the list! Thanks, Jim N7CXI _______________________________________________ Amps mailing list Amps@contes
I suppose in the case of my 76A it could be "sticky" contacts, since it only does it when warm after usage, and then only sometimes. Carl, you wouldn't happen to know of a good replacement off the to
I hate to step into this fray, but MFJ does. (no presumtion of quality, of course) He Who Shall Remain Nameless also has a viable circuit on his website. It uses dual roller inductors; a "Balanced L"
That sounds more like LB Cebik, W4RNL. Jerry Sevick W2FMI never had a site of his own that I know of. You have to dance a jig to get into Cebik's, site, but it can be done for free. I don't know if t
I love it... :-) My overgrown YC156 project already has the uP's, I'll have to see if I can fit a TCP/IP stack on one them as well. 73, Jim N7CXI _______________________________________________ Amps
Curious if anyone in the group had any strong feelings about how to go about RF-proofing RS-4XX interfaces? (RS-232, 422, 485) I have a couple of microprocessor projects in the works that will need t
I'm considering an AL-1500 as a backup amp, tilted to favor 160m AM operation. They are (relatively) inexpensive to buy, and I've cached up enough new and like-new 8877's to last a long, long time wi
Thanks, Carl. Fan noise I can probably handle - location and acoustical isolation from the operating desk should help. I just may give the AL-1500 a try. If that works out I should rebuild the blower
Rob, I'm running a couple of hundred feet of Davis Bury-Flex. It's worked at (legal) QRO levels from my Alphas on 75M AM, RTTY, SSTV etc without any meltdown issues. Of course I at least try to keep
The "chatter" from my Henry 3KA's resonant filter choke is worrying me, so I'm wondering whether to have it rewound and replace the cap, do that and also rewind the plate xformer, or just throw it al