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PA2AGA > HDDIG 16.02.00 03:09l 190 Lines 7608 Bytes #-9578 (0) @ EU
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Subj: HamDigitalDigest 2000/46B
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From: pa2aga
To: hd_broadcast@pa2aga
Subject: HamDigitalDigest 2000/46B
X-BBS-Msg-Type: B
Subject: PDA & TH-D7A Kenwood ht packet
What kind of PDA are you talking about here? I have used the D7 with a WinCE
2.0 HPC device with no problems. This site:
http://www.qsl.net/kc7gnm/packet_hpc.html shows you how to set up terminal
for a WinCe device. WinCE APRS coming """"soon"""" , someday.
The palm devices integrate with the D7 using Pocket APRS:
http://www.pocketaprs.com/ quite sucessfully.
Pretty much anything that has a serial port and a terminal program should
work.
Walter
My TH-D7 site:
http://www.radiohound.com
"Mike Wolsz" <wolobmp@neo.rr.com> wrote in message
news:38A8A33C.A32A9E1C@neo.rr.com...
> Hello,
> Looking for persons how have had any exposure and usage of the above
> Kenowwd ht/tnc unit and PDA units.
> Any problems with making theses items plug and play? What software is
> available? What abt the wiring...any problems here?
> Whatever info you can provide would be greatly appreicated....please
> send info to: wolobmp@neo.rr.com Thank you.
>.
------------------------------
Date: Mon, 14 Feb 2000 22:22:24 -0800
From: "Radio Randy" <rjones@theofficenet.com>
Subject: PK232 with Harris RF 3200
Roger,
I have no working knowledge of the Harris but your problem sounds like an
impedance mismatch problem. Perhaps the Harris is putting bias voltage on
the mike input line and affecting the PK-232 output. Maybe the Harris uses a
high level 600 ohm input and the PK-232 doesn't have the poop to drive it.
Just a thought.
Radio Randy
Roger Basford <Roger@g3vkm.demon.co.uk> wrote in message
news:ug1+NDA2FHo4EwOX@g3vkm.demon.co.uk...
> Hi,
>
> I am trying use a PK232 multi-mode TNC with a Harris RF 3200
> transceiver, without much success. I can key the rig and get audio from
> the RX into the TNC but there doesn't seem to be enough AF out of the
> TNC to drive the rig to more than a few watts output. This has not been
> a problem on the various amateur rigs I've owned. With soundcard
> programs everything is fine, as of course there is AF output from the
> card to spare. Has anyone else come across this? Perhaps an add-on
> buffer amplifier is all that's required?
>
> I don't have a technical manual for the Harris, only the operating and
> programming manuals so I'm unaware if there any internal level controls
> that could be tweaked. I've seen the same problem with two RF 3200s and
> so it's unlikely to be a rig fault. I'm connecting to the transceiver
> via the 15 way service connector on the rear panel but the effect is the
> same via the mic socket.
>
> Any feedback appreciated,
>
> Roger, G3VKM
>.
------------------------------
Date: Mon, 14 Feb 2000 11:09:39 -0600
From: "Steve Sampson" <ssampson@usa-site.net>
Subject: remote HF radio control over packet
I think that with controls such as button selection, or dial tuning,
that 1200 would be quite sufficient. I would get one of those remote
control programs for the serial port on the radio, and connect the radio
serial port to one TNC, and put another TNC at the rural site. A couple
of old TNC's fixed in the TRANSparent mode would good enough I suspect.
My KAM has an "INTerface MODEM" command, and that may be the
proper mode. I don't have a manual handy...
Steve
>.
------------------------------
Date: Mon, 14 Feb 2000 12:37:33 -0500
From: Gary Coffman <ke4zv@bellsouth.net>
Subject: remote HF radio control over packet
On Mon, 14 Feb 2000 11:29:04 -0500, "Mark Erbaugh" <mark@nospam.microenh.com>
wrote:
> I was thinking about just installing a computer controlled
>receiver at the remote site and then transmitting the audio back to my QTH
>over UHF. One possibility would be to use two UHF links - one over slow
>speed (1200 baud) packet to provide control of the receiver and another to
>transmit the analog audio (with appropriate ID insertion, etc). Another
>option would be to use a single high speed packet link that digitizes the
>receive audio and transmits that over packet. What kind of data rate would I
>need for usable audio, especially with a weak HF signal (remember if the
>audio is real strong / clear to begin with I can probably copy it from my
>home QTH)? Would 19.2K baud do it? Assuming 19.2K baud would do it, what
>kind of TNC and UHF radios are required? Is 19.2K packet equipment
>available? Where? How much? How can I get started? Would an analog audio
>link and 1200 baud control packet be less expensive?
Last question first, undoubtedly analog audio would be cheaper because
you can use nearly any off the shelf pair of FM radios to do it. Higher speed
digital requires a purpose designed RFmodem. That'll run you about $600
for each end (modem, transverter, and antenna) for a 56 kb system (WA4DSY
RF modem available from Paccomm). But a pair of $50 surplus Micor or Exec II
FM radios could handle the analog audio.
Now if you decide that you *want* to use a digital link anyway, there are a
number of codecs you might consider. There are codecs which can produce
decent sounding speech with only a 4800 baud link. That could be carried over
an ordinary FM radio like those mentioned above using HAPN modems. There
are other codecs which offer higher fidelity at the cost of greater bps, ie
there
are voice codecs which operate at 9.6 kb, 19.2 kb, etc. One thing you should
keep in mind, however, is that these codecs depend on a clean voice signal
input for their compression algorithms to work correctly. A weak noisy signal
won't work very well because it doesn't fit the model of the human voice that
the codec compression schemes use.
To properly reproduce the weak noisy signals you want to convey, you need
something that is more on the order of straight CD quality sampling. That's
going to require about 22 kilo*bytes* a second, or 172 kb. You can use a
compression scheme to crunch that down so it should fit a 56 kb bitstream.
(8 kilobytes per second sampling might be sufficient for "communications
quality" audio, and that'll fit a 64 kb bit stream without compression.)
There's no reason to packetize this data for a simple point to point link. The
packet overhead doesn't buy you anything because you don't need packet
routing, and you don't want packets with a few errors to be discarded and
retried because that'll leave gaps in the realtime audio stream. Better to
just accept a few bit errors, which will slightly add to the noise of the
original
signal. So you just drive the RF modem directly with the bitstream generated
by the A/D sampler and compression engine you choose. A sound card works
as the digitizer. You'll want to use a compression scheme that's tolerant of
a few bit errors. Some compression techniques fall apart if they encounter
bit errors. You don't want that.
Gary
Gary Coffman KE4ZV | You make it |mail to ke4zv@bellsouth.net
534 Shannon Way | We break it |
Lawrenceville, GA | Guaranteed |
>.
------------------------------
Date: Mon, 14 Feb 2000 11:29:04 -0500
From: "Mark Erbaugh" <mark@nospam.microenh.com>
Subject: remote HF radio control over packet
I'm kicking around building a remote HF receive site on a rural lot that I
own about 16 miles away from my QTH (hopefully, we will build a house there
To be continued in digest: hd_2000_46C
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