Dino:
All you have to do is turn those sounds off in Windows Audio Control..
BTW..that interface cost more than either of my 4 line twins!! Also
more than I have into BOTH PC's that I run in the shack.
a $15.00 PC audio card and a 25.00 (maybe less if you have a good junk
box) isolating interface is all that is really required.
I'm sure its a nice pc of equipment but IMHO, it would be waay overkill
for my system.
Curt
Dino Papas wrote:
And, oh by the way, a direct connection allows any other computer sounds ("you've got
mail", "boing", etc. etc.) that are played while you're transmitting to go right
along with your audio tones. The best way to prevent that is to use a dedicated interface with a
built-in sound card that precludes that situation from occurring. There is another company that
sells interface boxes, microHAM:
http://www.microham.com/
Dino KL0S
On 17Sep2010, at 9:58 AM, 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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