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Re: FT-817/ Power Protection
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Trevor Lewis
Re: recent word of a fried FT-817 from automotive starting surges; plus the
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817's lack of reverse- polarity protection; plus the fact that it's been noted that the DC socket on the back of the 817 isn't very robust and the conductors of Yaesu's cord that comes with the 817 are under-sized: It'd be an ingenious accessory if someone could come up with a base/ mobile connector or cord assembly with a compact surge/ polarity protector built right in. Better still if it could compactly and sturdily piggy-back on the 817's rear panel in a way that attaches into the 817's DC input and then offers some more robust connector or conductors for DC input. Perhaps it could be a small "box" that uses the 817's ground screw as a means of mechanical attachment to the 817; this power-filter unit could then also "sport" a small binding post for more ready RF ground connection. How's that for a wish list...? [If only I were an engineer or could practically get into designing and making such a unit; it's hard enough to find time to work on my own equipment] [I'm all for home-brew, and the NOGAPIG looks like it fits the bill electrically; it would just be nice if someone like W4RT could engineer up something that would also be ultra-compact/ sturdy/ mechanically elegant that would keep the compact "one small box" appeal of the 817, rather than having an armful of dangling appendages....] -----Original Message-----
From: Michael Melland [mailto:w9wis@...] Sent: Wednesday, July 11, 2001 1:38 PM To: FT817@... Subject: [FT817] FT-817 and Power Protection Idea With all the woe from reverse power, over voltage and current glitches it might be a good idea to take a look at the North Georgia QRP Club's NoGAPIG project (power indicator and guard). This kit provides over current, over voltage (crowbar) and reverse voltage protection along with a low battery voltage indicator for $15 including shipping. The kit includes board and board mounted parts except a NO pushbutton switch and enclosure. I ordered one yesterday... that little gem of a FT-817 is just too good to take a chance on frying ! Price is right and I know others who have built this into their QRP rigs and say it works great. I plan cut the board down to just the PiG and put it in a very small case.... Check it out here and let me know what you think: click on projects and then the PiG link and view the construction manual btw: I'm not a member of NOGA QRP Club nor do I think I know any members..... just trying to save some grief for us owners that "may" someday goof and apply power backwards or have some other glitch with a power supply. Of course we can fuse both leads with pico fuses and put a Zener diode across the leads now.... but this is a bit more secure. Mike, W9WIS -- Michael Melland, W9WIS QRP-L #1656 QRPARCI #9875 SOC #142 FPQRP #244 IPARC #252 EN54pc Winnebago Cty, Wisc. To unsubscribe from this group, send an email to: FT817-unsubscribe@... and for a great FAQ ( Frequently Asked Questions ) see Please note that your messages and files sent to this group become public domain upon submission and may appear anywhere on the Internet or in print without notice or compensation. Your use of Yahoo! Groups is subject to |
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