[Elecraft] K3 in ARRL10

[Guy Olinger K2AV]

Listening to 10m on a K3 with PRE off definitely would give the
appearance of "insensitivity" if compared to a RX that switched its
preamp on with a band change, or had the extra sensitivity switched
in.

Just one more reason that science grade RX comparisons are difficult
and require established protocols to do it right.

73, Guy.

On Tue, Dec 14, 2010 at 10:52 AM, Jorge Diez - CX6VM
<cx6vm.jorge at adinet.com.uy> wrote:
> Hi Guy,
>
> Thanks for the suggestion.
>
> Will try 10 mts with the PRE next time I go to the station. Unfortunately I
> didn´t tried it during the contest.
>
> On low bands sometimes I don´t need to use the PRE with my beverages, very
> good RX there.!
>
> 73,
> Jorge
> CX6VM/CW5W
>
> -----Mensaje original-----
> De: guyk2av at gmail.com [mailto:guyk2av at gmail.com] En nombre de Guy Olinger
> K2AV
> Enviado el: Martes, 14 de Diciembre de 2010 01:34 p.m.
> Para: Jorge Diez - CX6VM
> CC: w5ov at w5ov.com; John_N1JM; elecraft at mailman.qth.net
> Asunto: Re: [Elecraft] K3 in ARRL10
>
> Hi Jorge,
>
> If you are listening to weak signals on 10m with a K3, the PRE should
> be on.  It's really required unless your local 10m ambient noise is
> terrible.
>
> The FT1000MP built in this change in sensitivity, so it always had
> additional sensitivity automatically turned on for 10 meters.  This
> could be turned off in the menu.
>
> In the K3, the operator makes these choices, it's not automatic.  In
> general, the PRE should always be on for 10m.  By contrast on 160m,
> the ATT should be on and the PRE off, unless you are listening to a
> beverage or other low level RX antenna.  But these settings are left
> entirely to the operator.
>
> Those who have a high-end external preamp for ten meters (particularly
> remote pre-amps) will want the K3 internal preamp off.  That is one of
> the number of reasons why it is left to the operator to determine the
> proper setting of PRE/ATT to match the ambient noise at the ANT jack.
>
> Once the proper setting for your circumstance is determined, the K3
> will remember it so you don't have to adjust it constantly.
>
> 73, Guy.
>
> On Tue, Dec 14, 2010 at 5:53 AM, Jorge Diez - CX6VM
> <cx6vm.jorge at adinet.com.uy> wrote:
>> Hello,
>>
>> Sorry for the delay, but I was in a 6 hours drive trip yesterday.
>>
>> After reading the emails, I stopped at AC7AC email. I am very sure that I
>> have band noise. I heard a noticeable SHHHHHHHHHHHHH that I didn´t heard
> in
>> the TS850. I can do some records later this week when I go back to the
>> station.
>>
>> My setup is a ArraySolution sixpack, so I switch the 10 mts position to
> the
>> K3 and TS850.  The radios are connected to different models of amps and
> swr
>> meters, but I don´t know if this will affect.
>>
>> I didn´t use the PRE.
>>
>> 73,
>> Jorge
>> CX6VM/CW5W
>>
>>
>>
>> -----Mensaje original-----
>> De: elecraft-bounces at mailman.qth.net
>> [mailto:elecraft-bounces at mailman.qth.net] En nombre de w5ov at w5ov.com
>> Enviado el: Lunes, 13 de Diciembre de 2010 04:03 p.m.
>> Para: John_N1JM
>> CC: elecraft at mailman.qth.net
>> Asunto: Re: [Elecraft] K3 in ARRL10
>>
>> I operated the 10m contest this weekend with my K3 and I did have the
>> preamp on. In that condition, I heard a lot more than apparently could
>> hear me.
>>
>> If this could be quantified some way, perhaps we could get away from just
>> comparing opinions?
>>
>> de W5OV
>>
>>>
>>> Even though I do get a rise in band noise going from dummy load to
>>> antenna, I
>>> still hear weak signals on my 480 that I don't hear on the K3 on 10
> meters
>>> SSB. Not sure about cw (what's cw?) :-). Assuming my K3 is set up
>>> properly,
>>> I would hate to crank up the IF gain just for 10 meters.
>>> --
>>> View this message in context:
>>> http://elecraft.365791.n2.nabble.com/K3-in-ARRL10-tp5830988p5831388.html
>>> Sent from the Elecraft mailing list archive at Nabble.com.
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>>
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