Transceiver latency measurements

I noticed a mention of some latency issues in another thread on this forum.

Rob Sherwood has made some latency measurements of a selection of transceivers on receive at this page:

http://nc0b.com/latency/Latency%20tests%20on%20several%20transceivers-11.pdf

My own oscilloscope and pulsed audio testing, both on transmit and receive, give the following results on the two transceivers I have in the shack and which incidentally both work fine on VarAC.

Icom IC-7300 RX measurements using Data mode:

3 KHz bandwidth, 3.3 mS

2 KHz bandwidth, 3.5 mS

Icom IC-7300 TX measurements using Data mode:

4.2 mS

Elecraft K4D RX measurements using Data mode:

Any bandwidth, 32 mS

Elecraft K4D TX measurements using Data mode:

23 mS

The above figures are the pure delay timing through the respective transceiver chain, not including any additional TX/RX switching delays.

As you will see from the above, the humble Icom IC-7300 has significantly less latency than some other full SDR transceivers and indeed my IC-7300 works "out of the box" without any issues on Amtor using an SCS or Kantronics KAM, which is much more critical on timing and latency than VarAC.

73 Dave