On Thu,1/28/2016 11:04 AM, Clay Autery wrote:
OK... so I don't have time to complete my stack of cash for my K-Line
order... I've paired it back. Anyone interested in offering me a
second pair of eyes to see if I am making any glaring mistakes in
spec'ing out my reduced order?
Here's a link to a screen shot of my shopping cart:
*http://www.montac.com/pics/Elecraft_Draft_Order.jpg
*
MH-2 Hand Mic
Waste of money. Go with a Yamaha CM500 or Koss SB-45 headset with boom
mic. Both are comfortable, and both headphones and mic sound great.
SS30DV Power Supply
Any regulated PSU that will do 20A at 13.8V is fine.
And here's the filters I am going to end up with:
FL1 - Reserved for FM/Reserved for FM
FL2 - KFL3A-6K/KFL3A-6K (AM/eSSB)
I would put off buying a 6 kHz filter until you know you need it. The K3
is sufficiently stable that AM sounds quite good with SSB decoding.
FL3 - KFL3A-2.8_2.7sw/KFL3A-2.8_2.7sw (trade-up to 2.8kHz/8-pole on
both receivers)
Definitely NOT on the 2nd RX. The virtue of the 2.8 kHz filter is less
ripple in the passband, which results in a bit less incidental AM in
RTTY mode. That only matters in the main board. And when we run
diversity, it's usually to pull out super weak CW signals, so I wouldn't
worry about matching between RX for that one.
FL4 - KFL3A-400/KFL3A-400 (CW... yes, this "no-code" is diligently
working to achieve 25wpm before the end of summer)
FL5 - KFL3A-250/KFL3A-250 (CW)
As others have observed, remember that these are ROOFING filters, whose
function is to protect the DSP from super-strong signals outside the
passband. Primary IF filtering is provided in DSP. The two filters do,
of course, cascade when they are nearly the same bandwidth, resulting in
steeper skirts.
400 Hz is the desired bandwidth for RTTY because it has less phase shift
in the passband than a narrower filter. It's also a good CW filter. BUT
-- I am a very active contester and DXer, and I mostly use the 250 Hz
filter, and that's the one that I have in both RX.
You also want the KXV3B if it's not stock with the radio, both because
it gives you the preamp for 6/10/12M, and a patch point for the RX
signal path.
73, Jim K9YC
73
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