Wanted: HP-IL cables (UK) - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html) +--- Forum: Classifieds (/forum-6.html) +--- Thread: Wanted: HP-IL cables (UK) (/thread-15930.html) |
Wanted: HP-IL cables (UK) - pamphonica - 11-21-2020 05:22 PM Hi all, I am tearing my hair out trying to get my PIL-Box linked to my HP Portable Pro. It works sometimes with my HP71B, but seldom once I move cables to the PP. The main issue is the cables, I think. Mine are all home-made (martin Hepperle's design), and they seem to fit poorly and not to be very reliable (my fault in 3D printing, I expect). Every time I start to get sense on the HP-IL scope in ILPer, it stops shortly afterwards. So please has anyone got some HP-IL cables squirrelled away that I could buy? 3 or 4 would be nice, any length. I know there are a few on US Ebay but shipping makes those prohibitive. At least I can hopefully eliminate one potential fault cause if I can find some cables closer to home.. Many thanks Jeremy RE: Wanted: HP-IL cables (UK) - Dave Frederickson - 11-21-2020 07:35 PM The contacts in Martin's cable design are the OEM contacts, so I don't think that's an issue. Depending on the length, the cable itself may be an issue. One thing you can do to increase the robustness of the PIL-Box is to replace the series caps with pulse transformers. Here're instructions on how to mod the PIL-Box, courtesy of J-F. [attachment=8880] Dave Edit: I should mention that modification of the PIL-Box may void the warranty. RE: Wanted: HP-IL cables (UK) - pamphonica - 11-21-2020 07:41 PM I think the contacts themselves are fine - I got them from Martin. The final printed dimensions of the shells have caused a few problems with loose or tight fit. And there is a bit of judgement involved in finalising the depth of the contacts into the shells when glueing them in. I'm not sure I got that absolutely right, so may have issues there. I might experiment with contacts on the end of wires without shells. I probably made a rod for my own back though. I wanted my pil-box to look neat so printeda chassis connector pair as well, instead of cutting up a cable and soldering the two ends in, dangling. that adds a whole series of Jeremy-made connectors inline! And thanks for the hint re pulse transformers - that sounds a wise upgrade. -Jeremy RE: Wanted: HP-IL cables (UK) - pamphonica - 12-03-2020 07:30 PM Hopefully I will be getting a bunch of original cables shortly, so I should be sorted out. I have scrapped two homemade cables and re-used the two halves with original connectors and connected them directly to my PIL-Box, and added the pulse transformers at the same time. Works a lot better! Thanks all. -Jeremy |