VoyForums
[ Show ]
Support VoyForums
[ Shrink ]
VoyForums Announcement: Programming and providing support for this service has been a labor of love since 1997. We are one of the few services online who values our users' privacy, and have never sold your information. We have even fought hard to defend your privacy in legal cases; however, we've done it with almost no financial support -- paying out of pocket to continue providing the service. Due to the issues imposed on us by advertisers, we also stopped hosting most ads on the forums many years ago. We hope you appreciate our efforts.

Show your support by donating any amount. (Note: We are still technically a for-profit company, so your contribution is not tax-deductible.) PayPal Acct: Feedback:

Donate to VoyForums (PayPal):

[ Login ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1, 2, 3, 4, 5, 6, [7], 8, 9 ]

[ Next Thread | Previous Thread | Next Message | Previous Message ]

Date Posted: 06:00:59 03/02/02 Sat
Author: Potter
Subject: My observations
In reply to: Potter 's message, "Re: 5508w Reset and Bullet Protector Mod." on 06:00:15 03/01/02 Fri

That added diode is the 'bullet protector' mod that was applied to the 5507 - great work finding that one.
The 5508 data looks to me like it's manchester coded (normal or differential?) with more bits than the line18 data for earlier units. It appears to have a bit period of 2.2uS and contains 24-25 bits including the start bit and I did not notice a large burst at the start - the reason I left the large burst detector out of my circuit. The reason my 'fuzzy' auto invert method works is possibly because the last bit is a parity bit or the LSB of a checksum and is mostly set if the invert bit is on and vice versa if not or maybe I just lucked out.
Can anyone add more here? (I'm 'croless' at the moment so progress will delayed somewhat)
It would be very helpful if someone with a fast digital cro could post a picture or two of the packet for us to play with.

>I am also very interested in any info on 'chipping'
>these boxes but nothing has surfaced so far.
>
>
>>ok seing as the last one got so long I thought I would
>>move it all back to a new thread as its starting to
>>look ugly.
>>
>>I would like to know how every1 goes with these mods
>>and if any1 has managed to get any furthur with them
>>or have any other info on them.
>>
>>got can get the info I compiled from
>>http://asap1.hypermart.net/5508w
>>
>>I will add more info as I get it so if any1 has
>>anything I would like to add please let me know.
>>
>>I have heared there where fully hacked 5508w boxes
>>sold so if this is true there must be some info around
>>on how to do this other than the 3chip/potter mod.
>>
>>thank you and hope to hear peoples experiences with
>>these decoders with any type of mod they may have come
>>accross not just mine.

[ Next Thread | Previous Thread | Next Message | Previous Message ]

Replies:

[ Contact Forum Admin ]

Forum timezone: GMT-8
VF Version: 3.00b, ConfDB:
Before posting please read our privacy policy.
VoyForums(tm) is a Free Service from Voyager Info-Systems.
Copyright © 1998-2019 Voyager Info-Systems. All Rights Reserved.