Posted by
Phil LaMarche-2 on
Dec 03, 2010; 4:10pm
URL: http://elecraft.85.s1.nabble.com/Fwd-New-Sherwood-report-tp5793377p5800625.html
WOW!
Philip LaMarche
LaMarche Enterprises, Inc
[hidden email]
www.LaMarcheEnterprises.com
727-944-3226
727-937-8834 Fax
727-510-5038 Cell
www.w9dvm.com
K3 #1605
CCA 98-00827
CRA 1701
W9DVM
-----Original Message-----
From:
[hidden email]
[mailto:
[hidden email]] On Behalf Of Paul Christensen
Sent: Friday, December 03, 2010 10:56 AM
To:
[hidden email]
Subject: Re: [Elecraft] Fwd: New Sherwood report
> Why, yes IMO the K3 clicks too much.
Jim,
If you're experiencing clicks with your K3, you really need to investigate
with a scope. At the risk of pontificating, every station should have a
scope to monitor the transmit waveform. It can also be used to effectively
monitor T/R sequencing times when using an external amp. I suspect many
stations are hot-switching their amps and don't even know it until a T/R
relay's contacts fuse and the relay fails. Cost is no longer an excuse.
Anyone who can afford a K3 or FTdx5K can own a scope. Good quality used
scopes can be purchased on the surplus market between USD $100-200.
If I may make a plug for N8LP, he's got a forthcoming product that addresses
my pontification nicely:
http://www.telepostinc.com/LP-500.htmlCost will be more than a used oscilloscope, but it looks like his product is
concentrated on what we need for monitoring rather than general bench work.
Design and cosmetics appear to be commensurate with the Elecraft K3.
Paul, W9AC
----- Original Message -----
From: "Jan Erik Holm" <
[hidden email]>
To: <
[hidden email]>
Sent: Friday, December 03, 2010 10:18 AM
Subject: Re: [Elecraft] Fwd: New Sherwood report
Yes I do know that it´s not the rise/fall time
alone, that has never been my point. However
one factor is the rise/fall and if it´s too fast
it will not be possible to fix it with shaping.
Why, yes IMO the K3 clicks too much. I know it
can be done since there are radios around that
doesn´t click at all and at the same time the
keying is "hard enough" for normal CW use. Sure
you can´t key it to 500-600 lpm but thats not
normal CW.
/ Jim SM2EKM
-----------------
On 2010-12-03 16:00, Paul Christensen wrote:
>> OK. AFAIK at 4 ms a CW TX will have to much
> bandwith. Even the K3 at 5 ms (if it hasen´t changed
> since I measured it) do have "mild clicks".
>
> It' not strictly the rise/fall time, it's the shape of the RF envelope
> within the rise/fall time.
>
>
http://www.w8ji.com/cw_bandwidth_described.htm>
> Using the internal calibrator on my Tektronix SC504, I just measured the
> K3
> rise time at 2.5 ms. I measure from the time the envelope just begins to
> take off from zero until the point that full amplitude is reached.
> Actually, full power on my K3 is not achieved for several more msec, but
> the
> dominant transition to the full power is measured at 2.5 ms.
>
>> I wish the K3 could be set to something like 7 or 8 ms.
>
> Why?
>
> Paul, W9AC
>
______________________________________________________________
Elecraft mailing list
Home:
http://mailman.qth.net/mailman/listinfo/elecraftHelp:
http://mailman.qth.net/mmfaq.htmPost: mailto:
[hidden email]
This list hosted by:
http://www.qsl.netPlease help support this email list:
http://www.qsl.net/donate.html
______________________________________________________________
Elecraft mailing list
Home:
http://mailman.qth.net/mailman/listinfo/elecraftHelp:
http://mailman.qth.net/mmfaq.htmPost: mailto:
[hidden email]
This list hosted by:
http://www.qsl.netPlease help support this email list:
http://www.qsl.net/donate.html______________________________________________________________
Elecraft mailing list
Home:
http://mailman.qth.net/mailman/listinfo/elecraftHelp:
http://mailman.qth.net/mmfaq.htmPost: mailto:
[hidden email]
This list hosted by:
http://www.qsl.netPlease help support this email list:
http://www.qsl.net/donate.html