[Elecraft] K3 auxbus support

[Mark Bayern]

> auxBus peripherals. It will support the transverters and KRC2, but

Amazing ... you answered my transverter question before I was able to
type it in.

Lets talk satellite work -- can the xmit freq be changed while
transmitting (doppler?) can the sub receiver be receiving at the same
time as the main transmitter is transmitting? Can the VFOs be set to
track each other?

Thanks!

Mark AD5SS




On 4/28/07, wayne burdick <n6kr at elecraft.com> wrote:
> George,
>
> Thanks for bringing up this important issue. (The information below
> will be added to the FAQ when we get it going.)
>
> The K3 will provide backward compatibility with some, but not all K2
> auxBus peripherals. It will support the transverters and KRC2, but
> probably not the KAT100 or KPA100. If there's a way to make them work
> in the future we'll add support, but not in the first release of the
> transceiver, and probably not this year.
>
> In general, K3 auxbus device control will be limited to receive-mode
> communications. This means we can detect and set up auxbus devices at
> power-up, as well as send them band-change commands.
>
> Here's the reason for our hesitance to support transmit-mode auxbus
> devices, such as the KAT100 and KPA100:
>
> Like most modern transceivers with extensive computer support, the K3
> is the nexus for many low-level I/O signals (soundcard inputs and
> outputs, panadapter output, external reference input, etc.). The
> location of all these signals is the KIO3 module. This is also where
> our "ACC" connector is that has the auxBus line.
>
> Since the KPA100 and KAT100 make heavy use of the auxBus during
> transmit, there's the potential for RFI on these low-level signals
> lines during transmit at high power, through inadequate shielding,
> ground loops, or just proximity. It would take much more shielding,
> multilayer PC boards, and more complex internal and external cabling to
> ensure that this wasn't a problem. This would greatly increase the cost
> of the K3.
>
> We'll review what devices we can control as we start to do more complex
> system tests.
>
> 73,
> Wayne
> N6KR
>
> ---
>
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