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KSYN3A and below 490 KHz?

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KSYN3A and below 490 KHz?

I ordered a pair of the KSYN3A boards because mainly I have an interest in below 500 kHz.
I already have the KBPF3 General Coverage RX Bandpass boards installed in both my receivers.As I understand it I will need to use the RX & AUX antenna inputs.

Is it possible to move the lower limit down (lower than 100 kHz) or is is a constraint of the HW?
Will there be a Mod to the KBPF3 to allow it to work better below 500 kHz? Thank you
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wayne burdick

Re: KSYN3A and below 490 KHz?

Administrator

On Feb 18, 2015, at 10:10 AM, Harry Yingst via Elecraft <[hidden email]> wrote:

> I ordered a pair of the KSYN3A boards because mainly I have an interest in below 500 kHz.
> I already have the KBPF3 General Coverage RX Bandpass boards installed in both my receivers.As I understand it I will need to use the RX & AUX antenna inputs.

Correct.

>
> Is it possible to move the lower limit down (lower than 100 kHz) or is is a constraint of the HW?

The latter. Sensitivity gradually decreases as you do down in frequency, and you start hitting a practical lower limit for the receive chain.

The preamp is not useful below 500 kHz, and will actually introduce a loss when turned on, so it should be left off in this range.

> Will there be a Mod to the KBPF3 to allow it to work better below 500 kHz?

Probably not. It allows quite useful sensitivity down to 250 kHz, and even some utility at 100 kHz. But most operators are interested in the 600-meter band (472-479 kHz).

Wayne
N6KR

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Elecraft mailing list

Re: KSYN3A and below 490 KHz?

Thank you
Even getting this much additional range is a real treat to me.

From: Wayne Burdick <[hidden email]>
To: Harry Yingst <[hidden email]>
Cc: Elecraft Reflector <[hidden email]>
Sent: Wednesday, February 18, 2015 1:17 PM
Subject: Re: [Elecraft] KSYN3A and below 490 KHz?

On Feb 18, 2015, at 10:10 AM, Harry Yingst via Elecraft <[hidden email]> wrote:

> I ordered a pair of the KSYN3A boards because mainly I have an interest in below 500 kHz.
> I already have the KBPF3 General Coverage RX Bandpass boards installed in both my receivers.As I understand it I will need to use the RX & AUX antenna inputs.

Correct.

>
> Is it possible to move the lower limit down (lower than 100 kHz) or is is a constraint of the HW?

The latter. Sensitivity gradually decreases as you do down in frequency, and you start hitting a practical lower limit for the receive chain.

The preamp is not useful below 500 kHz, and will actually introduce a loss when turned on, so it should be left off in this range.

> Will there be a Mod to the KBPF3 to allow it to work better below 500 kHz?

Probably not. It allows quite useful sensitivity down to 250 kHz, and even some utility at 100 kHz. But most operators are interested in the 600-meter band (472-479 kHz).

Wayne
N6KR

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Ross Primrose

Re: KSYN3A and below 490 KHz?

In reply to this post by wayne burdick

On 2/18/2015 1:17 PM, Wayne Burdick wrote:
> Probably not. It allows quite useful sensitivity down to 250 kHz, and
> even some utility at 100 kHz. But most operators are interested in the
> 600-meter band (472-479 kHz). Wayne N6KR

At the rate they're going, my grand kids will probably be retired before
the FCC grants US hams access to that band :(

73, Ross N4RP

--
FCC Section 97.313(a) “At all times, an amateur station must use the minimum transmitter power necessary to carry out the desired communications.”

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Elecraft mailing list

Re: KSYN3A and below 490 KHz?

There's always 160-190 KC
1 watt into a 49' antenna

From: Ross Primrose <[hidden email]>
To:
Cc: Elecraft Reflector <[hidden email]>
Sent: Wednesday, February 18, 2015 2:12 PM
Subject: Re: [Elecraft] KSYN3A and below 490 KHz?

On 2/18/2015 1:17 PM, Wayne Burdick wrote:

> Probably not. It allows quite useful sensitivity down to 250 kHz, and
> even some utility at 100 kHz. But most operators are interested in the
> 600-meter band (472-479 kHz). Wayne N6KR

At the rate they're going, my grand kids will probably be retired before
the FCC grants US hams access to that band :(

73, Ross N4RP

--
FCC Section 97.313(a) “At all times, an amateur station must use the minimum transmitter power necessary to carry out the desired communications.”

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Elecraft mailing list

Re: KSYN3A and below 490 KHz?

In reply to this post by Ross Primrose

Hello All,My synthesizer board shipped today , Looking forward to testingMy new built HB power Amp on 630 meter band with no transverter.
Anyone can apply for a Experimental license to operate on the630M band - The cost is $ 65.00 for a two year Grant.73 allKen K5DNL/WG2XXM

On Wednesday, February 18, 2015 1:12 PM, Ross Primrose <[hidden email]> wrote:

On 2/18/2015 1:17 PM, Wayne Burdick wrote:
> Probably not. It allows quite useful sensitivity down to 250 kHz, and
> even some utility at 100 kHz. But most operators are interested in the
> 600-meter band (472-479 kHz). Wayne N6KR

At the rate they're going, my grand kids will probably be retired before
the FCC grants US hams access to that band :(

73, Ross N4RP

--
FCC Section 97.313(a) “At all times, an amateur station must use the minimum transmitter power necessary to carry out the desired communications.”

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Phil Wheeler-2

Re: KSYN3A and below 490 KHz?

What sort of antenna do you use for the 630 m band
TX, Ken?

Phil W7OX

On 2/18/15 4:19 PM, Ken Roberson via Elecraft wrote:

> Hello All,My synthesizer board shipped today , Looking forward to testingMy new built HB power Amp on 630 meter band with no transverter.
> Anyone can apply for a Experimental license to operate on the630M band - The cost is $ 65.00 for a two year Grant.73 allKen K5DNL/WG2XXM
>
>
> On Wednesday, February 18, 2015 1:12 PM, Ross Primrose <[hidden email]> wrote:
>
>
> On 2/18/2015 1:17 PM, Wayne Burdick wrote:
>> Probably not. It allows quite useful sensitivity down to 250 kHz, and
>> even some utility at 100 kHz. But most operators are interested in the
>> 600-meter band (472-479 kHz). Wayne N6KR
> At the rate they're going, my grand kids will probably be retired before
> the FCC grants US hams access to that band :(
>
> 73, Ross N4RP
>

Elecraft mailing list

Re: KSYN3A and below 490 KHz?

Hello All .
There is a photo of antenna and a little info on qrz-dot-com
Ken K5DNL/WG2XXM

On Wednesday, February 18, 2015 7:13 PM, Phil Wheeler <[hidden email]> wrote:

What sort of antenna do you use for the 630 m band
TX, Ken?

Phil W7OX

On 2/18/15 4:19 PM, Ken Roberson via Elecraft wrote:

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Elecraft mailing list

Re: KSYN3A and below 490 KHz?

Phil,
I'm txing now - WSPR - set ur dial to 474.2 khz - upper side band
Ken K5dnl/Wg2xxm

On Wednesday, February 18, 2015 8:06 PM, Ken Roberson <[hidden email]> wrote:

Hello All .
There is a photo of antenna and a little info on qrz-dot-com
Ken K5DNL/WG2XXM

On Wednesday, February 18, 2015 7:13 PM, Phil Wheeler <[hidden email]> wrote:

What sort of antenna do you use for the 630 m band
TX, Ken?

Phil W7OX

On 2/18/15 4:19 PM, Ken Roberson via Elecraft wrote:

Edward R Cole

Re: KSYN3A and below 490 KHz?

In reply to this post by Elecraft mailing list

Would not an external preamp designed for 100 KHz not improve
sensitivity? Many operators use small loop antennas with preamps on
both 600m and LF.

73, Ed - KL7UW, WD2XSH/45
-----------------------------------------------------------
Date: Wed, 18 Feb 2015 10:17:09 -0800
From: Wayne Burdick <[hidden email]>
To: Harry Yingst <[hidden email]>
Cc: Elecraft Reflector <[hidden email]>
Subject: Re: [Elecraft] KSYN3A and below 490 KHz?

====snipped
> Is it possible to move the lower limit down (lower than 100 kHz)
or is is a constraint of the HW?

The latter. Sensitivity gradually decreases as you do down in
frequency, and you start hitting a practical lower limit for the
receive chain.

The preamp is not useful below 500 kHz, and will actually introduce a
loss when turned on, so it should be left off in this range.

73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
[hidden email]

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Edward R Cole

Re: KSYN3A and below 490 KHz?

In reply to this post by Elecraft mailing list

Ross,

There a quite a few (50 or 100) hams happily operating on 600m,
currently. Not as hams but by obtaining an FCC experimental
license. If that seems too daunting a prospect, help is available
for filing out the application from those who have already done this.
http://www.500kc.com/
http://www.500kc.com/USA_600_M_Station_ID.htm
http://www.500kc.com/Maillists.htm

73, Ed - KL7UW, WD2XSH/45

----------------------------------------------------------
From: Ross Primrose <[hidden email]>
Cc: Elecraft Reflector <[hidden email]>
Subject: Re: [Elecraft] KSYN3A and below 490 KHz?
Message-ID: <[hidden email]>
Content-Type: text/plain; charset=windows-1252; format=flowed

On 2/18/2015 1:17 PM, Wayne Burdick wrote:
> Probably not. It allows quite useful sensitivity down to 250 kHz, and
> even some utility at 100 kHz. But most operators are interested in the
> 600-meter band (472-479 kHz). Wayne N6KR

At the rate they're going, my grand kids will probably be retired before
the FCC grants US hams access to that band :(

73, Ross N4RP

73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
[hidden email]

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