![]() ![]() The SignaLink USB must be connected to the radio's 6-pin mini-DIN Data Port so that it can use the wider bandwidth 9600 baud signal provided by the radio. See the above link to confirm which transformers your SignaLink has.Ģ. If your SignaLink USB is an older unit with the red colored through-hole transformers, then your max speed will likely be limited to somewhere between 15,000-20,000 bps. The SignaLink USB must be the newer unit with the black colored surface mount (SMT) transformers in order to take advantage of the fastest speeds offered by the VARA WIDE mode. A change was also made to the more readily available PCM2906C sound card chip (same family as the previously used PCM2904) in early 2017. It should also be noted that other improvements were made to the circuit design including better filtering of the USB power bus and internal bias voltages (this may lower the noise floor on some systems). ![]() The new transformer will NOT fit the old circuit board. If your SignaLink USB is an older model with the red colored 'through hole' transformers (see above link to confirm), then please note that the 3db bandwidth is narrower (~300-3300Hz) and it may not support the fastest speeds that VARA WIDE offers (see testing notes above).įor those asking about the possibility of upgrading their current SignaLink USB, please note that the SignaLink USB circuit board was redesigned to fit the new surface mount transformer. The normally specified 3db bandwidth of these transformers and the SignaLink USB as a whole, actually extends out much further than 4Khz and will be updated shortly. 25db bandwidth of the transformers is 200Hz to 4000Hz. We have been shipping wider bandwidth surface mount (SMT) isolation transformers (click for a picture) in the SignaLink USB since ~June 2018. SignaLink USB Audio Transformers and Other Changes We will be looking into this too so that we better understand what is happening, but as noted from our testing, the lower deviation still works very well. However, when we use a SignaLink USB that has been modified for more output and is capable of driving the radio to 2.5KHz deviation (TX modulation was verified to be clean and undistorted), the Auto Tune feature still lowers the level back down, and the resulting deviation is around 1.5KHz. This is the case with the TM-V71A that we are now testing with. We would also like to note, that as previously mentioned, some Kenwood radios appear to need more audio than the stock SignaLink USB can provide to reach the recommended 2.5KHz deviation. Since the recommended deviation is 2.5KHz, we plan to do some additional testing to see what affect deviation has on throughput, and what might be done to get the Auto Tune mode to actually set it there. We used the VARA program's Auto Tune feature to set the TX level both ways, but regardless of the adjustments we made (both TX and RX levels were experimented with) we always ended up with a deviation of approximately 1.5KHz. It should be noted that our testing was done with both radios underdeviated. I ended up turning it off when I use digital modes.and back on when I finish. My Kaspersky security software is a reaL pain. Please let us know if you have any further questions. Just be sure you have things backed up in case Windows does something unexpected. Windows Reset or a restore point as you suggested. New USB port to force a driver reinstall. If that doesn't work, then you might try in stalling the SignaLink on a It might still be there even if it doesn't show up in device manager. The next time it happens, you might want to ignore device manager and simply go through our Windows 10 setup to see if USB Audio Codec is displayed there. ![]() Regarding your question about the SignaLink, unfortunately we've never heard of this before. Here is the reply I received from Tigertronics: My computer keeps removing the Signalink USB sound card from my device manager? Suggestion on how to stop this please? I am having problems with my Windows 10 O/S and my Signalink USB device. ![]()
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