Dave,
To add to the replies which you have received, the width of your USB signal
should also include those intermodulation products which appear at
frequencies less than that of the suppressed carrier frequency, i.e. in the
LSB region. If you tuned your K3 to 14.225 MHz, these IMD products
http://www.contesting.com/articles/148
Chuck, KE9UW
aka Jack, BMW Motorcycles BMWMOA #224
From: elecraft-boun...@mailman.qth.net [elecraft-boun...@mailman.qth.net] on
behalf of David Guernsey [mooo1...@yahoo.com]
Sent: Saturday, July 14, 2012 3:39 PM
To:
Being a SDR there is really no suppressed carrier as the carrier is
never created only the sideband for the mode selected. So unless you
have signficant splatter there should not be an IMD problem with a K3.
Again assuming no splatter and a properly functioning radio.
This is no analog radio
Don:
Not so at all - whilst the low level SSB generated by the K3's DSP may
be close to theoretically perfect, intermodulation products produced by
the K3's IPA and final amplifier stages are present in quantity and are
the limiting factor.
Jack K8ZOA
On 7/15/2012 8:02 AM,
Hi Jack,
So I think what you are telling me is that the IPA is after the DSP and
that obvioulsy any inperfections in this circuit and the final amp are
what creates the IMD products.
Is that another reason that the tx filter is 2.7 or 2.8 wide at the
skirts to act as a wall to prevent this
Sorry Don, I was offline and I have just seen your comment, to which I see
Jack has responded. Thank you Jack!!
73,
Geoff
LX2AO
On July 15, 2012 at 2:02 PM, Don KD8NNU wrote:
Being a SDR there is really no suppressed carrier as the carrier is
never created only the sideband for the mode
Don:
The TX crystal filter is ahead of the IPA and HPA stages and while a
narrower filter may help a bit, the real source of almost all
transmitted 3rd, 5th, 7th, 9th etc. order IMD products is the power stages.
Jack K8ZOA
On 7/15/2012 9:12 AM, gold...@charter.net wrote:
Hi Jack,
So I
.
73 de Dick, K6KR
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of gold...@charter.net
Sent: Sunday, July 15, 2012 6:13 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] [K3] Tunijng the Radio
Hi Jack,
So I think what
You'll be in the General portion of 20m. Your band spread will take you up
to 14.2278 (+2.8 khz) which will be fine on USB.
73,
Ian, KM4IK
On Jul 14, 2012 6:55 PM, David Guernsey mooo1...@yahoo.com wrote:
If I tune my K3 to 14.225 MHz will I be in the General Class portion
of the 20 meter
In general, you have to allow for the width of your signal. As a rule of
thumb, I figure my USB/LSB signals occupy the range from the VFO suppressed
carrier frequency to 3 kHz away from the VFO frequency. Maybe 4 if you have
ESSB selected.
If you tune to 14.225, the suppressed carrier
Well, you'd be legal if your dial is accurate, but I prefer to move up a bit to
allow for Professor Murphy. And don't forget to stop at least 3kHz below the
top (14.347000). Reverse is true for LSB.
...bill nr4c
Sent from my Verizon Wireless Droid
-Original message-
From: David
Dave,
You have already received some correct answers, but let me try to inject
a bit of generalized information that should allow you to figure this
out in the future for any band and for either LSB or USB.
The K3 will display the (suppressed) carrier frequency. That means that
USB signals
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