[Elecraft] K3 transverter topics

[wayne burdick]

On Apr 28, 2007, at 6:37 PM, Mark Bayern wrote:

>
> Lets talk satellite work -- can the xmit freq be changed while
> transmitting (doppler?)

Yes, manually. If some kind of autotracking is desireable, it'll have 
to wait awhile.


> can the sub receiver be receiving at the same
> time as the main transmitter is transmitting?

When using the transverter ports -- maybe. Even at 0 dBm this presents 
a challenge, but we may be able to do it with shielding. It may also 
depend on the bands being used.


> Can the VFOs be set to
> track each other?

That's on the firmware list  ;)

73,
Wayne
N6KR

> 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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>>
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>
>

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