K3 as WSPR transmitter

[HP]

I see the lore is that the LPA does not care for long key down periods -
I was toying with using my K3 as WSPR tx on 160 and 80 fpor some antenna
evaluations. .

The lore would say its not a good idea ?

The manual is not clear to me of whether in fact there is a 160 low level out I
could use for a home brew external amp -The KIO3 transverter bands
show 160 coded -but other tables talk about just IF of 7 mhz and above.

BUT its all moot of the LPA is still biased on and limited in key down time ?????


Hank K7HP
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[donovanf]

Hi Hank,


While intuitively it would seem that WSPR is a viable method for
performing antenna evaluations, extreme short term variability of
the ionosphere makes it into a heroic task...


The only viable method I've found -- and it works very well --
is to install a reference antenna within about 1/2 wavelength
of the antenna under test, it MUST have the same polarization
as the antenna under test and ideally -- to avoid interactions --
neither antenna should "look through" the other.


In almost every case -- unless you have local RFI issues --
evaluations performed using your receiver produce nearly identical
results as using your transmitter.


73
Frank
W3LPL




----- Original Message -----

From: "HP" <[hidden email]>
To: [hidden email]
Sent: Sunday, January 5, 2020 9:54:28 PM
Subject: [Elecraft] K3 as WSPR transmitter

I see the lore is that the LPA does not care for long key down periods -
I was toying with using my K3 as WSPR tx on 160 and 80 fpor some antenna
evaluations. .

The lore would say its not a good idea ?

The manual is not clear to me of whether in fact there is a 160 low level out I
could use for a home brew external amp -The KIO3 transverter bands
show 160 coded -but other tables talk about just IF of 7 mhz and above.

BUT its all moot of the LPA is still biased on and limited in key down time ?????


Hank K7HP
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[Tony Estep]

On Sun, Jan 5, 2020 at 3:55 PM HP <[hidden email]> wrote:

> I see the lore is that the LPA does not care for long key down periods...
>
===========
I often transmitted on WSPR with my K3. A long keydown can't hurt anything
when you're only running 2 watts.

Tony KT0NY
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[NK7Z]

Same here, I have run 2 and 5 watts using WSPR, works great with my K3.

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 1/5/20 2:05 PM, Tony Estep wrote:

> On Sun, Jan 5, 2020 at 3:55 PM HP <[hidden email]> wrote:
>
>> I see the lore is that the LPA does not care for long key down periods...
>>
> ===========
> I often transmitted on WSPR with my K3. A long keydown can't hurt anything
> when you're only running 2 watts.
>
> Tony KT0NY
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

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[Bill Frantz]

I have run FT8, PSK31, and RTTY a lot on my K3. Even before I
installed the 100W amp card. I have never had any problem with
the low power amplifier (LPA) with those modes. I have also run
those modes at 100W with the KPA3 with no problems. I don't
think you'll have any problems with the 110.6 second WSPR
transmit sequence.

73 Bill AE6JV

On 1/5/20 at 4:54 PM, [hidden email] (HP) wrote:

>I see the lore is that the LPA does not care for long key down
>periods - I was toying with using my K3 as WSPR tx on 160 and
>80 fpor some antenna evaluations. .
>The lore would say its not a good idea ?
>The manual is not clear to me of whether in fact there is a 160
>low level out I could use for a home brew external amp -The
>KIO3 transverter bands show 160 coded -but other tables talk
>about just IF of 7 mhz and above.
>BUT its all moot of the LPA is still biased on and limited in key down time ?????
---------------------------------------------------------------------------
Bill Frantz        | Re IOT: "How many access control systems
does it take
www.pwpconsult.com | to change a light bulb?" - Dean Tribble

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[Eric Norris-2]

I've run my K3 at 5 watts on WSPR, at up to 20% tx percentage, for a week
at a time.  However, the case will get quite warm unless I run a 12v
low-speed fan pointed at the right side of the case.  I'll leave it to the
engineers as to whether this is necessary, but having the case stay
stone-cold makes me feel better.  Fans are available from Amazon and
everywhere else.

73 Eric WD6DBM

On Sun, Jan 5, 2020, 1:54 PM HP <[hidden email]> wrote:

> I see the lore is that the LPA does not care for long key down periods -
> I was toying with using my K3 as WSPR tx on 160 and 80 fpor some antenna
> evaluations. .
>
> The lore would say its not a good idea
>
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[Doug Turnbull]

Dear OMs and YLS,     Wht not just run 100mW to a Watt?    Surely then there is no heating problem.   I ask because I am starting the process of using WSPR on my K3.   73 Doug   EI2CNSent from my Samsung Galaxy smartphone.
-------- Original message --------From: Bill Frantz <[hidden email]> Date: 05/01/2020  22:12  (GMT+00:00) To: [hidden email] Subject: Re: [Elecraft] K3 as WSPR transmitter I have run FT8, PSK31, and RTTY a lot on my K3. Even before I installed the 100W amp card. I have never had any problem with the low power amplifier (LPA) with those modes. I have also run those modes at 100W with the KPA3 with no problems. I don't think you'll have any problems with the 110.6 second WSPR transmit sequence.73 Bill AE6JVOn 1/5/20 at 4:54 PM, [hidden email] (HP) wrote:>I see the lore is that the LPA does not care for long key down >periods - I was toying with using my K3 as WSPR tx on 160 and >80 fpor some antenna evaluations. .>The lore would say its not a good idea ?>The manual is not clear to me of whether in fact there is a 160 >low level out I could use for a home brew external amp -The >KIO3 transverter bands show 160 coded -but other tables talk >about just IF of 7 mhz and above.>BUT its all moot of the LPA is still biased on and limited in key down time ?????---------------------------------------------------------------------------Bill Frantz        | Re IOT: "How many access control systems does it takewww.pwpconsult.com | to change a light bulb?" - Dean Tribble______________________________________________________________Elecraft mailing listHome: http://mailman.qth.net/mailman/listinfo/elecraftHelp: http://mailman.qth.net/mmfaq.htmPost: mailto:[hidden email] list hosted by: http://www.qsl.netPlease help support this email list: http://www.qsl.net/donate.htmlMessage delivered to [hidden email]
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