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Contemplating Purchase of K3

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Richard Gillingham

Contemplating Purchase of K3

I’m thinking about purchasing the K3-100 kit. I plan start with the minimum configuration and adding features as I get the $$.. I already have the KX3, PX3 and am using the KPA500 and KAT500 with my Icom 756 Pro II.

I’ll assume I won’t need the internal atu with the K3, and will add the P3 and IF out board when the time comes. I’ll get the interface cable to the KAT500… With this bare bones K3, is there anything else that you all might feel is indispensable?

73 to all and good DX

Gil, W1RG

Sent from Windows Mail
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Chris Hallinan

Re: Contemplating Purchase of K3

I would recommend at least a filter or two. I believe the only filter
that comes with the radio is a 2.7 KHz. If you operate CW, you'll want
at least one for narrow cw, say maybe 400 or 500Hz. IF you're purely
an SSB op, you might consider the 1.8KHz filter for crowded band
conditions or contesting.

Speaking of filters, you can't operate 6-meter FM without the FM filter.

Other than that, you can't go wrong with a basic configuration and
add-on later. That's exactly what I did. But I didn't have my unit
long before I ordered the KXV3A, which is required for the panadapter,
and also provides an auxiliary rx antenna input.

73 and Good luck!

-Chris
K1AY

On Sat, Mar 7, 2015 at 11:42 AM, Richard Gillingham <[hidden email]> wrote:

> I'm thinking about purchasing the K3-100 kit. I plan start with the minimum configuration and adding features as I get the $$.. I already have the KX3, PX3 and am using the KPA500 and KAT500 with my Icom 756 Pro II.
>
>
> I'll assume I won't need the internal atu with the K3, and will add the P3 and IF out board when the time comes. I'll get the interface cable to the KAT500... With this bare bones K3, is there anything else that you all might feel is indispensable?
>
>
> 73 to all and good DX
>
> Gil, W1RG
>
>
>
>
>
>
> Sent from Windows Mail
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--
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Mike Markowski-2

Re: Contemplating Purchase of K3

In reply to this post by Richard Gillingham

Gil,

If you're a cw operator, I make heavy use of the 400 Hz filter. Not too
narrow (usually), and not too wide.

73,
Mike ab3ap

On 03/07/2015 11:42 AM, Richard Gillingham wrote:
> I’m thinking about purchasing the K3-100 kit. [...] With this bare
> bones K3, is there anything else that you all might feel is
> indispensable?
>
> 73 to all and good DX
>
> Gil, W1RG
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Art Hejduk

Re: Contemplating Purchase of K3

In reply to this post by Richard Gillingham

Gil,

When I bought my K3-100, the only thing I added was the 400 Hz filter, and
that seemed to work out well for me. Later, I added the KXV3A and the 13
kHz filter.

73,
Art WB8ENE
On Mar 7, 2015 11:52 AM, "Richard Gillingham" <[hidden email]> wrote:

> I’m thinking about purchasing the K3-100 kit. I plan start with the
> minimum configuration and adding features as I get the $$.. I already
> have the KX3, PX3 and am using the KPA500 and KAT500 with my Icom 756 Pro
> II.
>
>
> I’ll assume I won’t need the internal atu with the K3, and will add the P3
> and IF out board when the time comes. I’ll get the interface cable to the
> KAT500… With this bare bones K3, is there anything else that you all might
> feel is indispensable?
>
>
> 73 to all and good DX
>
> Gil, W1RG
>
>
>
>
>
>
> Sent from Windows Mail
> ______________________________________________________________
> Elecraft mailing list
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Alan Bloom

Re: Contemplating Purchase of K3

In reply to this post by Richard Gillingham

If you're a serious CW op you'll want a narrow-bandwidth crystal filter.
The stock SSB filter is fine for casual CW operation.

If your computer doesn't have an RS-232 port, you'll need a KUSB
USB-to-RS232 adapter so you can do firmware updates.

Other than that, a bare-bones K3 is quite sufficient.

Alan N1AL

On 03/07/2015 08:42 AM, Richard Gillingham wrote:

> I’m thinking about purchasing the K3-100 kit. I plan start with the
> minimum configuration and adding features as I get the $$.. I
> already have the KX3, PX3 and am using the KPA500 and KAT500 with my
> Icom 756 Pro II.
>
>
> I’ll assume I won’t need the internal atu with the K3, and will add
> the P3 and IF out board when the time comes. I’ll get the interface
> cable to the KAT500… With this bare bones K3, is there anything else
> that you all might feel is indispensable?
>
>
> 73 to all and good DX
>
> Gil, W1RG
>
>
>
>
>
>
> Sent from Windows Mail
> ______________________________________________________________
> Elecraft mailing list Home:
> http://mailman.qth.net/mailman/listinfo/elecraft Help:
> http://mailman.qth.net/mmfaq.htm Post:
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>

Joe Subich, W4TV-4

Re: Contemplating Purchase of K3

In reply to this post by Richard Gillingham

On 2015-03-07 11:42 AM, Richard Gillingham wrote:
> I’ll get the interface cable to the KAT500… With this bare bones K3,
> is there anything else that you all might feel is indispensable?

If you operate any CW or RTTY you will want the 400 Hz filter. IMO,
that's the best all around filter - particularly if you have any idea
of adding the KRX3 in the future since you will not need to try to
match five-pole filter center frequencies after the fact.

73,

... Joe, W4TV

On 2015-03-07 11:42 AM, Richard Gillingham wrote:

> I’m thinking about purchasing the K3-100 kit. I plan start with the minimum configuration and adding features as I get the $$.. I already have the KX3, PX3 and am using the KPA500 and KAT500 with my Icom 756 Pro II.
>
>
> I’ll assume I won’t need the internal atu with the K3, and will add the P3 and IF out board when the time comes. I’ll get the interface cable to the KAT500… With this bare bones K3, is there anything else that you all might feel is indispensable?
>
>
> 73 to all and good DX
>
> Gil, W1RG
>
>
>
>
>
>
> Sent from Windows Mail
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>

Jim Brown-10

Re: Contemplating Purchase of K3

In reply to this post by Mike Markowski-2

On Sat,3/7/2015 9:11 AM, Mike Markowski wrote:
> If you're a cw operator, I make heavy use of the 400 Hz filter. Not
> too narrow (usually), and not too wide.

There's a potential misunderstanding here. The plug-in filters are
ROOFING filters, and are there to protect the IF from overload by VERY
strong signals. The IF bandwidth is NOT dependent on those filters.
Rather, the IF in a K3, like the KX3, is filtered by DSP. Those filters
DO add to the selectivity of the K3 by virtue of a process called
"cascading," whereby they make the K3's filter skirts fall off more
sharply when the roofing filter is the same bandwidth or narrower than
the DSP IF.

So -- you DO probably need a CW roofing filter if you're a contester, or
if you have a close-in neighbor who is active on the same bands when you
are. For general operation, the IF is enough.

73, Jim K9YC
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Ross Primrose

Re: Contemplating Purchase of K3

In reply to this post by Joe Subich, W4TV-4

Or, get the 500Hz 8-pole from Inrad...

73, Ross N4RP

On 3/7/2015 12:29 PM, Joe Subich, W4TV wrote:
> If you operate any CW or RTTY you will want the 400 Hz filter. IMO,
> that's the best all around filter - particularly if you have any idea
> of adding the KRX3 in the future since you will not need to try to
> match five-pole filter center frequencies after the fact.

--
FCC Section 97.313(a) “At all times, an amateur station must use the minimum transmitter power necessary to carry out the desired communications.”

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Joe Subich, W4TV-4

Re: Contemplating Purchase of K3

The 400 Hz filter is marginally better for RTTY and no worse
for CW if there are strong signals close enough that a narrow
filter is needed to prevent "window overload" or AGC pumping.

73,

... Joe, W4TV

On 2015-03-07 12:52 PM, Ross Primrose wrote:

> Or, get the 500Hz 8-pole from Inrad...
>
> 73, Ross N4RP
>
> On 3/7/2015 12:29 PM, Joe Subich, W4TV wrote:
>> If you operate any CW or RTTY you will want the 400 Hz filter. IMO,
>> that's the best all around filter - particularly if you have any idea
>> of adding the KRX3 in the future since you will not need to try to
>> match five-pole filter center frequencies after the fact.
>
>

Richard Gillingham

Re: Contemplating Purchase of K3

In reply to this post by Richard Gillingham

Many thanks for the recommendations. The consensus is overwhelmingly for the 400 KHz filter. I’m primarily a DXer, and most of what I work is on CW. So… That will be on the list.

Thanks again to all

73

Gil, W1RG

From: Richard Gillingham
Sent: ‎Saturday‎, ‎March‎ ‎7‎, ‎2015 ‎11‎:‎52‎ ‎AM
To: [hidden email]

I’m thinking about purchasing the K3-100 kit. I plan start with the minimum configuration and adding features as I get the $$.. I already have the KX3, PX3 and am using the KPA500 and KAT500 with my Icom 756 Pro II.

I’ll assume I won’t need the internal atu with the K3, and will add the P3 and IF out board when the time comes. I’ll get the interface cable to the KAT500… With this bare bones K3, is there anything else that you all might feel is indispensable?

73 to all and good DX

Gil, W1RG

Sent from Windows Mail
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Dave, W8OV

Re: Contemplating Purchase of K3

In reply to this post by Richard Gillingham

If you want general coverage or VLF below the BC bands, I believe you'll
need the KBPF3 filter.

--Dave W8OV

On 3/7/2015 10:42 AM, Richard Gillingham wrote:

Rick WA6NHC

Re: Contemplating Purchase of K3

In reply to this post by Jim Brown-10

You may note on the Sherwood list that the difference between the 400
and 200 (5 pole) Hz filters is 3 db for close in spacing.

If you DX or contest, that could make a difference. I have the 400 (8
pole) in both receivers, but I'm now wondering about changing to the 200
filters 5 pole or 250 8 pole (I'm adding the new synth, when the
backorder is fulfilled). An edge is an edge but I suspect the 3 db is a
rather bare edge.

There is filter choice commentary on the Elecraft site, updated since I
made my purchase. Consider that required reading.

Can someone who has made the change comment? I can't do a comparison,
all filters slots are filled, both receivers matched.

If you want to use the K3 on local 6M repeaters, the 13 KHz filter
should be added (good for AM too). Adding the KXV3a gives you other
useful options (required for either preamp). If you operate digital (JT
modes in particular), the TCXO option helps. The KDVR3 saves your voice
if you contest or DX.

If your computer does not have a serial port, the Elecraft cable (comes
with, make your choice which flavor you want) is fine. Along that line,
getting a multiport USB dongle is simpler in the long run (I have a 4
port, so one USB controls everything K line).

If you want to operate on the experimental band, the KBPF3 is required.

If you ever want to take the K3 someplace else (field day, portable,
mobile in the RV) the tuner would be handy to have; else get the KAT500
(later? also in preparation for an amp; life is too short for QRP and
you can always turn the power output down).

Rick's rule of radio: Buy ALL the options you THINK you might EVER want
at the original time of purchase because the budget will never be there
to add on. However Elecraft is the one exception, mods and updates are
generally simple.

I'd strongly suggest looking though the options and consider how YOU
operate, how you intend to grow and if they'd be useful now (buy) or
later (budget). The answer to your question becomes self-evident. Since
you can add more later if your mode of operation changes, you can adapt
(building a budget to get you there).

Caveat: If you're new to HF, contesting or DXing, having the receiver
dialed in for the WORST operating conditions is your best advantage...
close in strong signals are common in CW (your best DXing mode) and digital.

Welcome to the Elecraft family,
Rick wa6nhc (no relation to Elecraft except as a happy user)
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Jim Brown-10

Re: Contemplating Purchase of K3

On Sat,3/7/2015 10:26 AM, Rick WA6NHC wrote:
> I'm now wondering about changing to the 200 filters 5 pole or 250 8
> pole (I'm adding the new synth, when the backorder is fulfilled). An
> edge is an edge but I suspect the 3 db is a rather bare edge.

I started with 400 Hz, then added 250 Hz. I've defined the 400 Hz filter
as 450 Hz (so that it switches in at 450 Hz) and the 250 Hz filter as
350 Hz. Both are 8 pole filters. I find that I nearly always have the IF
set to 200-250 Hz for CW, and 400 Hz for RTTY. In other words, I rarely
use the 400 Hz filter.

It should be noted that the 250 Hz filter actually measures closer to
325-350 Hz. Since they're the same price, I'd buy the 250 Hz filter if I
was going to buy one at all.

73, Jim K9YC
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Ian Kahn, KM4IK

Re: Contemplating Purchase of K3

In reply to this post by Richard Gillingham

I would still consider adding the 100W internal ATU for a couple of reasons. If your KAT500 goes out and you have to send it back to the mother ship for repair, you'll still be able to use any antenna you want. You won't be forced into finding resonant antennas for the bands you want to operate. Also, it will be much easier to operate portable (I know, you have the KX3 :-) ) if you ever want to do so. And, the K3 is a great rig for operating portable if you want more juice than the KX3 offers. Just ask anyone who's been on the recent DXpeditions that used the K-Line.

Hope this is helpful.

73 de,

--Ian
Ian Kahn, KM4IK
Roswell, GA EM74ua
[hidden email]
10-10 #74624, North Georgia Chapter #2038
PODXS 070 #1962
K3# 281, P3 #688, KAT500 #860, KPA500 #1468

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of Richard Gillingham
Sent: Saturday, March 7, 2015 11:42 AM
To: [hidden email]
Subject: [Elecraft] Contemplating Purchase of K3

I’m thinking about purchasing the K3-100 kit. I plan start with the minimum configuration and adding features as I get the $$.. I already have the KX3, PX3 and am using the KPA500 and KAT500 with my Icom 756 Pro II.

I’ll assume I won’t need the internal atu with the K3, and will add the P3 and IF out board when the time comes. I’ll get the interface cable to the KAT500… With this bare bones K3, is there anything else that you all might feel is indispensable?

73 to all and good DX

Gil, W1RG

Sent from Windows Mail
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Joe Subich, W4TV-4

Re: Contemplating Purchase of K3

In reply to this post by Jim Brown-10

> I find that I nearly always have the IF set to 200-250 Hz for CW, and
> 400 Hz for RTTY. In other words, I rarely use the 400 Hz filter.

Whilst the 250 Hz filter works for strong signals on RTTY, the group
delay increases rapidly as one approaches the knee of the response.
That group delay has a significant impact on RTTY and causes a loss
of several dB snr on weak signals that can hardly afford the added
hit.

The main purpose of the *roofing filter* is to protect the analog to
digital converter from overload by multiple strong signals at the same
time (and to prevent the hardware AGC from activating). The difference
in selectivity between the 400 Hz (435 Hz @ -6dB) and 250 Hz (370 Hz @
-6dB) - see http://www.elecraft.com/K3/K3_filter_plots.htm is only
some 30 Hz on each side of the passband. If a strong signal is close
enough to be in that 30 Hz a slight tweak of the shift control will
move him out. Even then, it is entirely likely that any signal close
enough to cause problems in the 400 Hz filter will have phase noise,
splatter and/or key clicks that fall inside the passband of *either*
filter and can't be rejected in any case.

If one is looking for the most efficient combination of IF filters,
consider 400 Hz (or 500 Hz if RTTY is not a priority) with the 200 Hz
(5 pole) as the 200 Hz filter is tighter than the 250 Hz filter to at
least -50 dB on the skirts (and the 200 Hz filter is less expensive
than the 250 Hz filter).

73,

... Joe, W4TV

On 2015-03-07 1:43 PM, Jim Brown wrote:

> On Sat,3/7/2015 10:26 AM, Rick WA6NHC wrote:
>> I'm now wondering about changing to the 200 filters 5 pole or 250 8
>> pole (I'm adding the new synth, when the backorder is fulfilled). An
>> edge is an edge but I suspect the 3 db is a rather bare edge.
>
> I started with 400 Hz, then added 250 Hz. I've defined the 400 Hz filter
> as 450 Hz (so that it switches in at 450 Hz) and the 250 Hz filter as
> 350 Hz. Both are 8 pole filters. I find that I nearly always have the IF
> set to 200-250 Hz for CW, and 400 Hz for RTTY. In other words, I rarely
> use the 400 Hz filter.
>
> It should be noted that the 250 Hz filter actually measures closer to
> 325-350 Hz. Since they're the same price, I'd buy the 250 Hz filter if I
> was going to buy one at all.
>
> 73, Jim K9YC
> ______________________________________________________________
> Elecraft mailing list
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>

Bill Coleman-2

Re: [Bulk] Contemplating Purchase of K3

In reply to this post by Richard Gillingham

> On Mar 7, 2015, at 11:42 AM, Richard Gillingham <[hidden email]> wrote:
>
> I’ll assume I won’t need the internal atu with the K3, and will add the P3 and IF out board when the time comes. I’ll get the interface cable to the KAT500… With this bare bones K3, is there anything else that you all might feel is indispensable?

My wife bought me a stock K3/100 for Christmas 2012. It replaced my K2/100 w/KAT100. So, the first item I bought was the KAT3 antenna tuner. If you were planning to get the KAT500, I would go with that an not bother with the KAT3.

I used the rig pretty much stock for many months. Other may encourage you to buy lots of filters, but you can do a heck of a lot with the rig with the stock filter.

Bill Coleman, AA4LR, PP-ASEL Mail: [hidden email]
Web: http://boringhamradiopart.blogspot.com
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901

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Edward R Cole

Re: Contemplating Purchase of K3

In reply to this post by Richard Gillingham

Per usual, I am late responding (I receive the list by digest about
2-3 times/day):

First off, I am not a HF contester or DXer, so my use of CW is casual
(avoid when the former activity is present). I bought the 8-pole
filters: 2.8-KHz and 400-Hz. The former because I run diversity on a
KRX3 (which only has the 2.8-KHz). I figured the steeper filters
would be valuable for resale (if that ever came to happen). I also
bought the 13-KHz filter for FM (on VHF using transverters; also
works on 10m & 6m). The 13-KHz is installed for AM.

I have found in the very little CW operation on HF that I actually
like tuning around with DSP bw = 500-Hz or wider. Once settled on a
particular CW signal bw can be reduced to 400-Hz for quieter band reception.

The only time I run CW at very narrow bw (typ. 100-Hz) is for CW-eme
signals (very weak). I find those signals using a water-fall display
(using either MAP65 display or Spectravue). Usually tune them with
wider bw until exactly at the pitch I desire and then reduce DSP bw
to enhance signal readability.

Since you are a DXer, I suspect the 400-Hz 8-pole might give you a
slight edge over the 500-Hz 5-pole in a crowded band (especially if
you have close neighbor stations also vying for the DX). Then the
new SYNTH ought to help a lot.

My two cents observation from a non-expert.

73, Ed - KL7UW

Date: Sat, 7 Mar 2015 18:10:59 +0000
From: Richard Gillingham <[hidden email]>
To: "=?utf-8?Q?[hidden email]?=" <[hidden email]>
Subject: Re: [Elecraft] Contemplating Purchase of K3
Message-ID: <[hidden email]>
Content-Type: text/plain; charset="utf-8"

Many thanks for the recommendations. The consensus is overwhelmingly
for the 400 KHz filter. I?m primarily a DXer, and most of what I
work is on CW. So? That will be on the list.

Thanks again to all

73

Gil, W1RG

73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
[hidden email]

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Johnny Siu

Contemplating Purchase of K3

In reply to this post by Ian Kahn, KM4IK

If you have already had the KX3 for portable use, then internal KAT3 may not be necessary. All depends on your operation style.
73
Johnny VR2XMC
寄件人︰ Ian - Ham <[hidden email]>
收件人︰ 'Richard Gillingham' <[hidden email]>; [hidden email]
傳送日期︰ 2015年03月8日 (週日) 3:10 AM
主題︰ Re: [Elecraft] Contemplating Purchase of K3

I would still consider adding the 100W internal ATU for a couple of reasons. If your KAT500 goes out and you have to send it back to the mother ship for repair, you'll still be able to use any antenna you want. You won't be forced into finding resonant antennas for the bands you want to operate. Also, it will be much easier to operate portable (I know, you have the KX3 :-) ) if you ever want to do so. And, the K3 is a great rig for operating portable if you want more juice than the KX3 offers. Just ask anyone who's been on the recent DXpeditions that used the K-Line.

Hope this is helpful.

73 de,

--Ian
Ian Kahn, KM4IK
Roswell, GA EM74ua
[hidden email]
10-10 #74624, North Georgia Chapter #2038
PODXS 070 #1962
K3# 281, P3 #688, KAT500 #860, KPA500 #1468

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of Richard Gillingham
Sent: Saturday, March 7, 2015 11:42 AM
To: [hidden email]
Subject: [Elecraft] Contemplating Purchase of K3

I’m thinking about purchasing the K3-100 kit. I plan start with the minimum configuration and adding features as I get the $$.. I already have the KX3, PX3 and am using the KPA500 and KAT500 with my Icom 756 Pro II.

I’ll assume I won’t need the internal atu with the K3, and will add the P3 and IF out board when the time comes. I’ll get the interface cable to the KAT500… With this bare bones K3, is there anything else that you all might feel is indispensable?

73 to all and good DX

Gil, W1RG

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