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KBPF3A < TT Jupiter on Broadcast Band

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Carl Jón Denbow

KBPF3A < TT Jupiter on Broadcast Band

I recently installed a KBPF3A in the sub receiver. I've been surprised
to discover on direct A/B comparisons using the same antenna that my old
TT Jupiter is much more sensitive on the broadcast band. A station that
comes in at S-6 on the Jupiter is maybe an S-2 on the K3s. This is
very noticeable to the ear, as you might imagine. I'm wondering if
anyone else has noticed that the KBPF3A is not exactly optimized for the
broadcast band.

Also, I have another issue related to the Jupiter and the K3s. I tried
to install my new SP3 so that I could switch between using it with the
K3s and the Jupiter with the front switch. However, when I hook the K3s
to the SP3 when the Jupiter is connected, it immediately mutes the
speaker. I can then switch to the K3s connection, and it's working
fine. Switch to the Jupiter and it's muted, unless I physically
disconnect the K3s in the back of the SP3. I've looked at the rather
simple schematic of the SP3, and I can't figure out why this is
happening. It appears to me that something must be shorting ring and
sleeve in the K3s, but I can't exactly figure out how his can be
happening. Any help would be appreciated.

73,

Carl
--
=================================================
Carl Jón Denbow, N8VZ
17 Coventry Lane
Athens, Ohio 45701-3718

[hidden email]
www.n8vz.com
EM89wh

IRLP 4533 Echolink 116070

PSK and JT65 Forever!
=================================================

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Vic Rosenthal

Re: KBPF3A < TT Jupiter on Broadcast Band

There is a high pass filter in the K3 to protect the t/r switch. It is in the circuit to the main antenna input. To listen to the bc band you should use the rx antenna input which is after the h/p filter.

Vic 4X6GP/K2VCO
Sent from my phone

> On Oct 21, 2015, at 1:36, Carl Jón Denbow <[hidden email]> wrote:
>
> I recently installed a KBPF3A in the sub receiver. I've been surprised to discover on direct A/B comparisons using the same antenna that my old TT Jupiter is much more sensitive on the broadcast band. A station that comes in at S-6 on the Jupiter is maybe an S-2 on the K3s. This is very noticeable to the ear, as you might imagine. I'm wondering if anyone else has noticed that the KBPF3A is not exactly optimized for the broadcast band.
>
> Also, I have another issue related to the Jupiter and the K3s. I tried to install my new SP3 so that I could switch between using it with the K3s and the Jupiter with the front switch. However, when I hook the K3s to the SP3 when the Jupiter is connected, it immediately mutes the speaker. I can then switch to the K3s connection, and it's working fine. Switch to the Jupiter and it's muted, unless I physically disconnect the K3s in the back of the SP3. I've looked at the rather simple schematic of the SP3, and I can't figure out why this is happening. It appears to me that something must be shorting ring and sleeve in the K3s, but I can't exactly figure out how his can be happening. Any help would be appreciated.
>
> 73,
>
> Carl
> --
> =================================================
> Carl Jón Denbow, N8VZ
> 17 Coventry Lane
> Athens, Ohio 45701-3718
>
> [hidden email]
> www.n8vz.com
> EM89wh
>
> IRLP 4533 Echolink 116070
>
> PSK and JT65 Forever!
> =================================================
>
> ______________________________________________________________
> 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]

______________________________________________________________
Elecraft mailing list
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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

Frank Krozel

Re: KBPF3A < TT Jupiter on Broadcast Band

Carl, see Jupiter manual, text on I-1
Ungrounded speaker, speakers terminals balanced load.
Frank, KG9H

> On Oct 21, 2015, at 12:39 AM, Vic Rosenthal <[hidden email]> wrote:
>
> There is a high pass filter in the K3 to protect the t/r switch. It is in the circuit to the main antenna input. To listen to the bc band you should use the rx antenna input which is after the h/p filter.
>
> Vic 4X6GP/K2VCO
> Sent from my phone
>
>> On Oct 21, 2015, at 1:36, Carl Jón Denbow <[hidden email]> wrote:
>>
>> I recently installed a KBPF3A in the sub receiver. I've been surprised to discover on direct A/B comparisons using the same antenna that my old TT Jupiter is much more sensitive on the broadcast band. A station that comes in at S-6 on the Jupiter is maybe an S-2 on the K3s. This is very noticeable to the ear, as you might imagine. I'm wondering if anyone else has noticed that the KBPF3A is not exactly optimized for the broadcast band.
>>
>> Also, I have another issue related to the Jupiter and the K3s. I tried to install my new SP3 so that I could switch between using it with the K3s and the Jupiter with the front switch. However, when I hook the K3s to the SP3 when the Jupiter is connected, it immediately mutes the speaker. I can then switch to the K3s connection, and it's working fine. Switch to the Jupiter and it's muted, unless I physically disconnect the K3s in the back of the SP3. I've looked at the rather simple schematic of the SP3, and I can't figure out why this is happening. It appears to me that something must be shorting ring and sleeve in the K3s, but I can't exactly figure out how his can be happening. Any help would be appreciated.
>>
>> 73,
>>
>> Carl
>> --
>> =================================================
>> Carl Jón Denbow, N8VZ
>> 17 Coventry Lane
>> Athens, Ohio 45701-3718
>>
>> [hidden email]
>> www.n8vz.com
>> EM89wh
>>
>> IRLP 4533 Echolink 116070
>>
>> PSK and JT65 Forever!
>> =================================================
>>
>> ______________________________________________________________
>> 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]
> ______________________________________________________________
> 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]

Carl Jón Denbow

Re: KBPF3A < TT Jupiter on Broadcast Band

Thanks, Frank. That's interesting because the shield is usually grounded. I guess this means I'm muting the Jupiter speaker when I connect the K3s because I'm grounding the floating Jupiter speaker circuit to the K3s ground. 73 de Carl, N8VZ

Sent from my iPhone

> On Oct 21, 2015, at 6:29 AM, "[hidden email]" <[hidden email]> wrote:
>
>
> Carl, see Jupiter manual, text on I-1
> Ungrounded speaker, speakers terminals balanced load.
> Frank, KG9H
>
>
>> On Oct 21, 2015, at 12:39 AM, Vic Rosenthal <[hidden email]> wrote:
>>
>> There is a high pass filter in the K3 to protect the t/r switch. It is in the circuit to the main antenna input. To listen to the bc band you should use the rx antenna input which is after the h/p filter.
>>
>> Vic 4X6GP/K2VCO
>> Sent from my phone
>>
>>> On Oct 21, 2015, at 1:36, Carl Jón Denbow <[hidden email]> wrote:
>>>
>>> I recently installed a KBPF3A in the sub receiver. I've been surprised to discover on direct A/B comparisons using the same antenna that my old TT Jupiter is much more sensitive on the broadcast band. A station that comes in at S-6 on the Jupiter is maybe an S-2 on the K3s. This is very noticeable to the ear, as you might imagine. I'm wondering if anyone else has noticed that the KBPF3A is not exactly optimized for the broadcast band.
>>>
>>> Also, I have another issue related to the Jupiter and the K3s. I tried to install my new SP3 so that I could switch between using it with the K3s and the Jupiter with the front switch. However, when I hook the K3s to the SP3 when the Jupiter is connected, it immediately mutes the speaker. I can then switch to the K3s connection, and it's working fine. Switch to the Jupiter and it's muted, unless I physically disconnect the K3s in the back of the SP3. I've looked at the rather simple schematic of the SP3, and I can't figure out why this is happening. It appears to me that something must be shorting ring and sleeve in the K3s, but I can't exactly figure out how his can be happening. Any help would be appreciated.
>>>
>>> 73,
>>>
>>> Carl
>>> --
>>> =================================================
>>> Carl Jón Denbow, N8VZ
>>> 17 Coventry Lane
>>> Athens, Ohio 45701-3718
>>>
>>> [hidden email]
>>> www.n8vz.com
>>> EM89wh
>>>
>>> IRLP 4533 Echolink 116070
>>>
>>> PSK and JT65 Forever!
>>> =================================================
>>>
>>> ______________________________________________________________
>>> 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]
>> ______________________________________________________________
>> 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]
>

Bob McGraw - K4TAX

Re: KBPF3A < TT Jupiter on Broadcast Band

Per the manual the 538 Jupiter uses a floating audio output circuit for
the speaker. Therefore, one can not ground one side of the speaker line.

73
Bob, K4TAX

On 10/21/2015 10:00 AM, Carl Jón Denbow wrote:

> Thanks, Frank. That's interesting because the shield is usually grounded. I guess this means I'm muting the Jupiter speaker when I connect the K3s because I'm grounding the floating Jupiter speaker circuit to the K3s ground. 73 de Carl, N8VZ
>
> Sent from my iPhone
>
>> >On Oct 21, 2015, at 6:29 AM,"[hidden email]" <[hidden email]> wrote:
>> >
>> >
>> >Carl, see Jupiter manual, text on I-1
>> >Ungrounded speaker, speakers terminals balanced load.
>> >Frank, KG9H
>> >
>> >