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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>
>
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