Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net

   Home   Help Search  
Pages: [1]   Go Down
  Print  
Author Topic: shielded-cable used on old style keyboards?  (Read 1323 times)
KM3K
Member

Posts: 324




Ignore
« on: May 28, 2011, 12:08:41 AM »

It is well known that SignaLink-USB only does AFSK for RTTY.
So, to get FSK for true RTTY,  I bought a W3YY kit.
Since the kit does not include an enclosure, the connectors or cables, I'm shopping around for those parts.
One connector/cable, that I need, is a 6-pin male mini-DIN and 5-wire shielded cable.
I have in storage an old E-machines keyboard which was part of a computer system that I bought in 2000.
I noted that it has a 6-pin male mini-DIN connector (rather than the USB-connector seen on newer keyboards).
To find out if its cable was shielded and how many wires its cable had, I took it apart.
But I am unable to see if there is a shield on the cable because the end of the cable's jacket at the keyboard is covered up with shrink-tubing.
There are five wires coming out of the shrink-tubing.
So my question is, "Does anyone know if the old-style keyboard has a shield on its cabling?"
I should mention that I'm not about to butcher up my old keyboard; I have other plans for it.
Rather, I'd hunt around for a similar old style keyboard and get its connector/cable.
73 Jerry KM3K
« Last Edit: May 28, 2011, 12:41:04 AM by KM3K » Logged
KM3K
Member

Posts: 324




Ignore
« Reply #1 on: May 30, 2011, 11:10:24 AM »

Well, after a couple days here with no replies, I put my question to the Yaesu FT-950 group on Yahoo since I'd be connecting this cable to my FT-950.
The answers there have that I should not expect a shield on the cable; after all, a shield would only add cost to the product.
To quote one reply, "I used a similar cable for PSK31 with a Rascal. it has no shield, works great but i use ferrite to keep out RF." I'll use that idea.
So on now to the next problem.
73 Jerry KM3K
Logged
N0SYA
Member

Posts: 369




Ignore
« Reply #2 on: May 30, 2011, 12:09:21 PM »

Hi
Some hard-wired usb devices, such as kb and mouse that I have, already have good sized ferrites on them from the factory. I use a mouse and kb on a broken laptop and they impart no noise on hf when on battery power that I can find, at least so far. You might try cat cable for connecting ham gear, using one of each pair for data/control, and grounding the other of the pair. They are twisted to reduce rfi/emi, and I have heard that they are often quieter electromagnetically than shielded cables used in the same manner. Just some thoughts for ya.
Logged

If you have a clumsy child, you make them wear a helmet. If you have death prone children, you keep a few clones of them in your lab.
TANAKASAN
Member

Posts: 933




Ignore
« Reply #3 on: June 05, 2011, 02:32:39 AM »

Leads to computer keyboards are shielded. Your five leads coming out the end are:

Shield
Negative power
Positive power
Clock (from PC to keyboard)
Data (bidirectional)

Tanakasan
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!