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[na-user] Re: CW control with NA

To: <na-user@contesting.com>
Subject: [na-user] Re: CW control with NA
From: ROBERT WANDERER <aa0cy@robertwanderer.gardnerville.nv.us> (ROBERT WANDERER)
Date: Thu, 20 Feb 1997 17:52:15 -0800
I use LPT on a "parts-is-parts" Pentium 133 and an Emerson 286 with LTA 
Universal Interface
and a homebrew job based on the schematic in CT7 and NA6, which I think is 
unchanged in
NA10. No problems keying either a TS940 or a FT1000D

----------
From:  dap14@chrysler.com[SMTP:dap14@chrysler.com]
Sent:  Thursday, February 20, 1997 4:54 AM
To:  na-user@ve7tcp.ampr.org
Subject:  [na-user] Re: CW control with NA

     There are a couple things you can check if it appears that the keying
     transistor is not being turned on.  If you're using a COM port, check
     the voltage between the base and emitter of the keying transistor,
     which should be in the range of 0.6 to 0.7 volts DC.  If its low, you
     can reduce the value of the 1K base resistor to turn the transistor on
     more fully.

     With an LPT port, you can make the same base-emitter voltage check.
     Also, check the voltage from LPT pin 1 to ground - this contributes to
     the minimum key down voltage measured in the first paragraph.  If its
     more than 0.5 VDC or so, I would suspect your LPT card is hosed.

     Many newer computers come with what are called "bidirectional" LPT
     ports.  I have no technical details on these ports, so I don't know if
     there are any issues which would preclude successful keying.  Anybody
     have any knowledge on this?

     Hope this helps - 73, Dave/K8CC



______________________________ Reply Separator _________________________________
Subject: [na-user] CW control with NA
Author:  reisert+list-na-user-outgoing-owner@ve7tcp.ampr.org at SMTP
To: <na-user@contesting.com>
Date:    2/18/97 11:46 PM


Attachment file number 1, file name
Creation date:  February 18, 1997 23:46:18
Document Type:  ASCI, Document Class: MEMO
Author:
Comment:        [na-user] CW control with NA
Level:          1, Number : 1



Here's hoping that some of you have already seen in the past and solved
my current problem...

CW control using NA10.?? on my 486-50, in the key-down mode, gives me
about half-power and a tone that's not clear.  Like when I turn the
speed up all the way on my MFJ keyer instead of use the "tune" button.

When I used the same program and interface on an ancient Compaq 386-16
(now deceased), I had no keying problems; clear tone; full power out.

I suspect that I have a nasty-looking ground on the 486, but haven't yet
checked.  Anybody experienced something similar, and care to give
details about how to proceed?

Thanks in advance -
Dave (WL7DB in Kenai, Alaska)

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