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PA2AGA > HDDIG 28.07.00 11:44l 175 Lines 6220 Bytes #-9299 (0) @ EU
BID : HD_2000_201D
Read: GUEST
Subj: HamDigitalDigest 2000/201D
Path: DB0AAB<DB0KFB<DB0CZ<F6KFG<DB0PSC<DB0ACH<PI8JOP<PI8ZAA<PI8HGL
Sent: 000728/0718Z @:PI8HGL.#ZH1.NLD.EU #:65348 [Den Haag] FBB $:HD_2000_201D
From: PA2AGA@PI8HGL.#ZH1.NLD.EU
To : HDDIG@EU
Date: Fri, 28 Jul 00 08:01:58 MET
Message-Id: <hd_2000_201D>
From: pa2aga@pe1mvx.ampr.org
To: hd_broadcast@pa2aga.ampr.org
X-BBS-Msg-Type: B
From: "George , W5YR" <w5yr@att.net>
Subject: RigBlaster
The Kachina 505DSP implements its RS232 communication with the computer
via a MAX232 chip internal to the radio. Direct cable from the computer
serial port to the radio.
72/73, George W5YR - the Yellow Rose of Texas
Fairview, TX 30 mi NE Dallas in Collin county QRP-L 1373
Amateur Radio W5YR, in the 54th year and it just keeps getting better!
R/C since 1964 - AMA 98452 RVing since 1972 Kachina #91900556
(12/99)
Rob Janssen wrote:
> Most hamradio equipment manufacturers are too cheap to include RS232
> circuits in their transceivers: they provide the signal as TTL, and leave
> the conversion to RS232 to an external interface sold as an optional extra.
------------------------------
Date: Tue, 25 Jul 2000 16:53:18 GMT
From: nomail@rob.knoware.nl (Rob Janssen)
Subject: RigBlaster
Hamish Moffatt VK3SB <hamish@cloud.net.au> wrote:
>That is quite a lot of work. I investigated isolation for the CAT
>control connection between my rig and the PC. I have a 4N25 in the PTT,
>but nothing in the CAT control (which doesn't appear to be causing
>any problems). Without biasing circuits you can't pass the bipolar
>RS-232 signal through the optocoupler because it uses an LED and
>photodiode.
Most hamradio equipment manufacturers are too cheap to include RS232
circuits in their transceivers: they provide the signal as TTL, and leave
the conversion to RS232 to an external interface sold as an optional extra.
Of course no real ham buys this interface (another $50 item that has only a
MAX232 in it!). When you build your own, you can include isolation in it,
and conveniently do it at the TTL side.
Rob
--
+----------------------------------+--------------------------------------+
| Rob Janssen pe1chl@amsat.org | WWW: http://www.knoware.nl/users/rob |
| AMPRnet: rob@pe1chl.ampr.org | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
+----------------------------------+--------------------------------------+
------------------------------
Date: Tue, 25 Jul 2000 16:47:54 GMT
From: nomail@rob.knoware.nl (Rob Janssen)
Subject: RigBlaster
Bob Lewis <rlewis@staffnet.com> wrote:
>What I don't understand is where this "ground loop" comes from. Why
>would it suddenly appear if I use a different antenna or upgrade my
>computer? My understanding of a "ground loop" is that it is caused by
>a difference of potential (60 Hz) between the computer ground and the
>rig ground and that causes current to flow in the shield of the audio
>cables.
No. This may be a problem as well, but that is not a ground loop.
The ground loop is a loop of wire through your shack.
It does not suddenly appear or disappear, but its adverse effects may.
Because it causes trouble only if current is induced in it by a magnetic
field, and if this current is converted to voltage by a resistor some
where it should not be. (ground connection in a connector, path between
connector and signal ground of input amplifier, etc)
Rob
--
+----------------------------------+--------------------------------------+
| Rob Janssen pe1chl@amsat.org | WWW: http://www.knoware.nl/users/rob |
| AMPRnet: rob@pe1chl.ampr.org | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
+----------------------------------+--------------------------------------+
------------------------------
Date: Wed, 26 Jul 2000 08:09:46 GMT
From: nomail@rob.knoware.nl (Rob Janssen)
Subject: RigBlaster
George , W5YR <w5yr@att.net> wrote:
>The Kachina 505DSP implements its RS232 communication with the computer
>via a MAX232 chip internal to the radio. Direct cable from the computer
>serial port to the radio.
Is the RS232 signal ground isolated from the frame ground?
Rob
--
+----------------------------------+--------------------------------------+
| Rob Janssen pe1chl@amsat.org | WWW: http://www.knoware.nl/users/rob |
| AMPRnet: rob@pe1chl.ampr.org | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
+----------------------------------+--------------------------------------+
------------------------------
Date: Wed, 26 Jul 2000 11:04:53 GMT
From: hamish@cloud.net.au (Hamish Moffatt VK3SB)
Subject: RigBlaster
Rob Janssen <nomail@rob.knoware.nl> wrote:
> Most hamradio equipment manufacturers are too cheap to include RS232
> circuits in their transceivers: they provide the signal as TTL, and leave
> the conversion to RS232 to an external interface sold as an optional extra.
> Of course no real ham buys this interface (another $50 item that has only a
> MAX232 in it!). When you build your own, you can include isolation in it,
> and conveniently do it at the TTL side.
True. This must be the first disadvantage to having RS-232 straight
out of the radio though (as my FT-847 does).
Hamish
--
Hamish Moffatt VK3SB <hamish@debian.org> <hamish@cloud.net.au>
------------------------------
Date: Tue, 25 Jul 2000 16:50:07 GMT
From: jdouglas@timewave.com (John Douglas)
Subject: Rigblaster with Yaesu FT-840 Help Needed
In article <20000724225820.23349.00001189@ng-fi1.aol.com>, kt4ht@aol.com
(Kt4ht) wrote:
>I have a Yaesu FT-840 that I am trying to use the Rigblaster with. Using
>Digipan, I have not been able to get the automatic keying to work. When I
plug
>in both the serial cable and audio in from the computer to the Rigblaster,
the
>automatic keying does not work. With the audio in disconnected, the automatic
>keying works fine, but of course, there is no transmit audio.
>
>The jumpers are set as per the manual for Yaesu rigs and all michrophone
>functions work correctly. I can send PSK31 if I key the rig manually.
>
>Any help would be appreciated.
>
>Mike, KT4HT
Hello Mike,
Are you absolutely certain of your comport selection and settings? That would
cause this symptom.
73
John N0ISL
------------------------------
End of Ham-Digital Digest V2000 #201
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