Curt -
You are correct. That is why I said he "COULD" do that. I did it years
ago when PSK31 was 'new', I saw something on it somewhere, found some
software, and was on the air in about 15 minutes. :-) I used it for
about three months, and lost interest. I guess my ADD keeps popping up,
as I have to try everything, but once it becomes a 'plug and play'
product I lose interest. I've been from RTTY / autostart, to slow scan
TV with the old P7 phosphor monitor, packet, PSK31, weak signal VHF/UHF,
moonbounce, etc., etc., etc. All are fun and interesting for a while,
but I guess my ADD kicks in and I'm off to the next thing. :-)
I used VOX, so minimal chance for PC damage.
So, agreed, not the ideal arrangement, but sufficient to give it a shot!
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-B, C-Line&
TR-4/C Service Supplement CDs
<www.k4oah.com>
Curt Nixon wrote:
While you can do the interconnect directly, if you choose to do it
without isolation, you face two potentially big issues.
1. ground loop induced noise in tx and rx. This can render the system
non-decodable in tx and no decodes in rx.
2. Potential for destrying the PC card and or Keying port if you use
hard keying.
Will it work? Probably. But it's like tempting fate with no isolation.
JMHO
Curt
Garey Barrell wrote:
Hi Bill -
Well, not much.... All you have to do is put receiver audio into the
PC sound card, and sound card output into the transmitter MIC.
You CAN plug the SPKR output from the R-4B into the LINE IN or MIC
input on the computer with the appropriate adapters, and plug the
LINE OUT or SPKR OUT of the computer into the MIC connector of the
T-4XB, again with the appropriate adapters.
You then have to adjust the various levels, R-4B AF GAIN, the input
level for the PC, the output level for the PC and the GAIN control on
the T-4XB so that nothing is overdriven. IF you use the MIC input on
either unit, you may need a resistive divider to drop the input level
enough to prevent overdriving.
OR, you can purchase one of the following hardware interconnect
devices. Some provide transformer isolation, adjustable levels,
cables, etc. and come complete with directions for installation.
RigExpert <http://www.rigexpert.com/>
Rigblaster <http://www.westmountainradio.com/RIGblaster.htm>
Tigertronics SignaLink <http://www.tigertronics.com/>
Buxcom Rascal <http://www.packetradio.com/>
All that being said, you will probably find that the B-Line is
marginally acceptable for frequency stability with PSK31. The PSK31
signal is only 31 Hz wide, so there doesn't have to be much drift to
lose the signal completely. I DID operate PSK31 with a B-Line back
when PSK31 was new, and after they were on for an hour or so were
stable enough for reasonable QSO lengths. They are NOT stable enough
for 20 minute QSOs unless you keep one hand on the dial!
You may be much more satisfied with one of the several PSK31
dedicated transceivers that are pretty inexpensive. You only need a
very few watts, (2-5W,) so not an expensive proposition. Some are in
kit form which is another bonus!
One very nice solution is the PSK Series transceivers by Small Wonder
Labs <http://www.smallwonderlabs.com/> . These have the interface
mentioned above included in the transceiver.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-B, C-Line&
TR-4/C Service Supplement CDs
<www.k4oah.com>
Bill Ellis wrote:
Hi all,
I'm looking for a method to hook up a T-4XB & R-4B for PSK31. What
kind of circuitry would I need to build for this.
Thanks,
Bill, WB9CAC
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