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K3S odd KAT3A behavior and question

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ae4pb

K3S odd KAT3A behavior and question

I was playing with my K3S listening to code on 40m. I could clearly hear the
signal but it wasn't loud. I spun the dial up a good bit and listened,
nothing heard after about a minute so I pressed ATU Tune. The ATU clicked a
few times and stopped. I spun back down where I was (somewhere around
7.033MHz) and dialed in the signal. Sounded about the same. Just for grins I
did a long press ATU Tune (ATU) to BYPASS. The signal immediately jumped
over S9 (was around S7 before). That didn't make sense so I repeated the
process a few times with the same results.

Am I wrong to expect a higher signal level with the ATU tuned than bypassed?

Thanks in advance.

Jerry Moore

AE4PB, K3S - S.N. 010324

An Amatuer is - Considerate, Loyal, Progressive, Friendly, Balanced, and
Patriotic.

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Bob McGraw - K4TAX

Re: K3S odd KAT3A behavior and question

If I understand this correctly. It seems you set / tuned the ATU for a
higher frequency, being the 2nd frequency where you listened, then moved
back down band with out retuning. It would seem then the ATU would be
set for some frequency other than the one you were receiving. Yes,
going to bypass might indeed likely show a higher received signal.

73
Bob, K4TAX

On 10/2/2015 2:00 PM, [hidden email] wrote:

> I was playing with my K3S listening to code on 40m. I could clearly hear the
> signal but it wasn't loud. I spun the dial up a good bit and listened,
> nothing heard after about a minute so I pressed ATU Tune. The ATU clicked a
> few times and stopped. I spun back down where I was (somewhere around
> 7.033MHz) and dialed in the signal. Sounded about the same. Just for grins I
> did a long press ATU Tune (ATU) to BYPASS. The signal immediately jumped
> over S9 (was around S7 before). That didn't make sense so I repeated the
> process a few times with the same results.
>
>
>
> Am I wrong to expect a higher signal level with the ATU tuned than bypassed?

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Jerry Moore

Re: K3S odd KAT3A behavior and question

I only tuned enough to not be on top of the station.

On October 2, 2015 10:40:28 PM EDT, Bob McGraw - K4TAX <[hidden email]> wrote:

>If I understand this correctly. It seems you set / tuned the ATU for
>a
>higher frequency, being the 2nd frequency where you listened, then
>moved
>back down band with out retuning. It would seem then the ATU would be
>set for some frequency other than the one you were receiving. Yes,
>going to bypass might indeed likely show a higher received signal.
>
>73
>Bob, K4TAX
>
>On 10/2/2015 2:00 PM, [hidden email] wrote:
>> I was playing with my K3S listening to code on 40m. I could clearly
>hear the
>> signal but it wasn't loud. I spun the dial up a good bit and
>listened,
>> nothing heard after about a minute so I pressed ATU Tune. The ATU
>clicked a
>> few times and stopped. I spun back down where I was (somewhere around
>> 7.033MHz) and dialed in the signal. Sounded about the same. Just for
>grins I
>> did a long press ATU Tune (ATU) to BYPASS. The signal immediately
>jumped
>> over S9 (was around S7 before). That didn't make sense so I repeated
>the
>> process a few times with the same results.
>>
>>
>>
>> Am I wrong to expect a higher signal level with the ATU tuned than
>bypassed?
>
>
>______________________________________________________________
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
>Help: http://mailman.qth.net/mmfaq.htm
>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]

--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
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Bob McGraw - K4TAX

Re: K3S odd KAT3A behavior and question

I tried this a couple of times with my K3S. Didn't notice any
difference between the tuner active and tuner bypassed.

Tuner insertion loss is in the order of 1.0 dB or less when matched,
depending on which side of 50 ohms it is required to match. Very low Z
matches tend to show a bit more loss than values above 50 ohms.

73
Bob, K4TAX

On 10/2/2015 9:44 PM, Jerry Moore wrote:

> I only tuned enough to not be on top of the station.
>
> On October 2, 2015 10:40:28 PM EDT, Bob McGraw - K4TAX
> <[hidden email]> wrote:
>
> If I understand this correctly. It seems you set / tuned the ATU for a
> higher frequency, being the 2nd frequency where you listened, then moved
> back down band with out retuning. It would seem then the ATU would be
> set for some frequency other than the one you were receiving. Yes,
> going to bypass might indeed likely show a higher received signal.
>
> 73
> Bob, K4TAX
>
> On 10/2/2015 2:00 PM, [hidden email] wrote:
>
> I was playing with my K3S listening to code on 40m. I could
> clearly hear the signal but it wasn't loud. I spun the dial up
> a good bit and listened, nothing heard after about a minute so
> I pressed ATU Tune. The ATU clicked a few times and stopped. I
> spun back down where I was (somewhere around 7.033MHz) and
> dialed in the signal. Sounded about the same. Just for grins I
> did a long press ATU Tune (ATU) to BYPASS. The signal
> immediately jumped over S9 (was around S7 before). That didn't
> make sense so I repeated the process a few times with the same
> results.
>

ae4pb

Re: K3S odd KAT3A behavior and question

Operator error. I somehow had Ant 2 selected which begs the question as to how I was receiving signals at all (nothing is connected to ant 2). Selecting the actual antenna and such works 100%.

From: Bob McGraw - K4TAX [mailto:[hidden email]]
Sent: Friday, October 02, 2015 10:57 PM
To: Jerry Moore; [hidden email]
Subject: Re: [Elecraft] K3S odd KAT3A behavior and question

I tried this a couple of times with my K3S. Didn't notice any difference between the tuner active and tuner bypassed.

Tuner insertion loss is in the order of 1.0 dB or less when matched, depending on which side of 50 ohms it is required to match. Very low Z matches tend to show a bit more loss than values above 50 ohms.

73
Bob, K4TAX

On 10/2/2015 9:44 PM, Jerry Moore wrote:

I only tuned enough to not be on top of the station.

On October 2, 2015 10:40:28 PM EDT, Bob McGraw - K4TAX <mailto:[hidden email]> <[hidden email]> wrote:

If I understand this correctly. It seems you set / tuned the ATU for a
higher frequency, being the 2nd frequency where you listened, then moved
back down band with out retuning. It would seem then the ATU would be
set for some frequency other than the one you were receiving. Yes,
going to bypass might indeed likely show a higher received signal.

73
Bob, K4TAX

On 10/2/2015 2:00 PM, [hidden email] wrote:

I was playing with my K3S listening to code on 40m. I could clearly hear the
signal but it wasn't loud. I spun the dial up a good bit and listened,
nothing heard after about a minute so I pressed ATU Tune. The ATU clicked a
few times and stopped. I spun back down where I was (somewhere around
7.033MHz) and dialed in the signal. Sounded about the same. Just for grins I
did a long press ATU Tune (ATU) to BYPASS. The signal immediately jumped
over S9 (was around S7 before). That didn't make sense so I repeated the
process a few times with the same results.

______________________________________________________________
Elecraft mailing list
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Help: http://mailman.qth.net/mmfaq.htm
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Oliver Dröse

Re: K3S odd KAT3A behavior and question

Not sure about the new KAT3A but the KAT3 relays only have about 30 dB
isolation so even with ANT2 selected and nothing connected to it you
will still hear strong signals coupling in from ANT1.

73, Olli - DH8BQA

Contest, DX & radio projects: http://www.dh8bqa.de

Am 04.10.2015 um 18:04 schrieb [hidden email]:

> Operator error. I somehow had Ant 2 selected which begs the question as to how I was receiving signals at all (nothing is connected to ant 2). Selecting the actual antenna and such works 100%.
>
>
>
>
>
> From: Bob McGraw - K4TAX [mailto:[hidden email]]
> Sent: Friday, October 02, 2015 10:57 PM
> To: Jerry Moore; [hidden email]
> Subject: Re: [Elecraft] K3S odd KAT3A behavior and question
>
>
>
> I tried this a couple of times with my K3S. Didn't notice any difference between the tuner active and tuner bypassed.
>
> Tuner insertion loss is in the order of 1.0 dB or less when matched, depending on which side of 50 ohms it is required to match. Very low Z matches tend to show a bit more loss than values above 50 ohms.
>
>
>
> 73
> Bob, K4TAX
>
> On 10/2/2015 9:44 PM, Jerry Moore wrote:
>
> I only tuned enough to not be on top of the station.
>
> On October 2, 2015 10:40:28 PM EDT, Bob McGraw - K4TAX <mailto:[hidden email]> <[hidden email]> wrote:
>
> If I understand this correctly. It seems you set / tuned the ATU for a
> higher frequency, being the 2nd frequency where you listened, then moved
> back down band with out retuning. It would seem then the ATU would be
> set for some frequency other than the one you were receiving. Yes,
> going to bypass might indeed likely show a higher received signal.
>
> 73
> Bob, K4TAX
>
> On 10/2/2015 2:00 PM, [hidden email] wrote:
>
> I was playing with my K3S listening to code on 40m. I could clearly hear the
> signal but it wasn't loud. I spun the dial up a good bit and listened,
> nothing heard after about a minute so I pressed ATU Tune. The ATU clicked a
> few times and stopped. I spun back down where I was (somewhere around
> 7.033MHz) and dialed in the signal. Sounded about the same. Just for grins I
> did a long press ATU Tune (ATU) to BYPASS. The signal immediately jumped
> over S9 (was around S7 before). That didn't make sense so I repeated the
> process a few times with the same results.
>
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> 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]
>