Re: [Elecraft] KBPF3 mod SMD capacitors

[Nicklas Johnson]

Thank you, Keith, this is exactly what I needed to know!

   Nick

On Tue, 25 Jul 2023 at 12:54, Keith Trinity WE6R  wrote:

> We use; C3,C4,C60.1uF , 50V, 10% X7R 0603Elecraft part # E530306
> It is not critical.
>
> Mouser and others have them;
> https://www.mouser.com/c/?q=0.1%20uF%2C50V%2C10%25%2CX7R%2C0603%2CSMD
>
> DigiKey;
> https://www.digikey.com/en/products/filter/ceramic-capacitors/60?s
>
> FYI, it is easiest to just tack the new capacitor on the old one instead
> of removing the old one, wicking, cleaning.
> Keith WE6R Elecraft K3/K4
>
>
>

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Re: [Elecraft] KBPF3 mod SMD capacitors

[Keith Trinity WE6R]

We use; C3,C4,C6    0.1uF , 50V, 10% X7R 0603    Elecraft part # E530306
It is not critical.

Mouser and others have them;
https://www.mouser.com/c/?q=0.1%20uF%2C50V%2C10%25%2CX7R%2C0603%2CSMD

DigiKey; https://www.digikey.com/en/products/filter/ceramic-capacitors/60?s

FYI, it is easiest to just tack the new capacitor on the old one instead 
of removing the old one, wicking, cleaning.

Keith WE6R Elecraft K3/K4


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[Elecraft] KBPF3 mod SMD capacitors

[Nicklas Johnson]

I know the original KBPF3 mod kit is no longer available, but I've come
across an unmodified board that I'm considering trying to source parts for
to handle the mod myself.

I did some searching and I read that a Nichicon RL81C221MDN1KX might work
for the electrolytic cap, but I haven't found what the spec is for the 0603
SMD 0.1uF capacitors.
Are these MLCCs, such that something like VJ0603Y104JXJAC would work?

   Nick

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[Elecraft] KBPF3 Mod kit for K3

[Rob S. via Elecraft]

I purchased the KBPF3 mod kit to update my General coverage receive module. I 
have a K3 purchased 10-15-14 and KBPF3 module Purchased 3-20-15. I'm confused 
because my board says KBPF3 Rev. A but its an A2 and apparently the newer board 
is an A3. I contacted Elecraft support and was told that this brand new mod kit 
isn't all that I need and there are additional parts that they will send to me. 
After reading the email, it sounds exactly like whats included in the kit. Can 
anyone shed some light on this? I'm a little lost. I assumed that the upgrade 
kit would be accurate with all current parts and instructions.
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Re: [Elecraft] KBPF3 mod kit

[Nr4c]

Can't speak for right/left but yes to the one with the handle. 

Sent from my iPhone
...nr4c. bill


> On Mar 13, 2017, at 5:11 PM, Dauer, Edward  wrote:
> 
> I just ordered the KIO3B and a KBPF3 mod kit for the K3.  The process of 
> installing the KBPF3 mod provides access to the small battery under the 
> plastic protective cover.  The K3 is about five years old.  Would it be worth 
> replacing that battery while I am in there, or do they last essentially 
> forever?  The mod will also require removing the Sub Rx.  As I remember, that 
> was the most frustrating part of the original build.  I would appreciate any 
> tips on how to remove and – especially – replace the Sub Rx with a minimum of 
> cussing.  Would removing the right side panel help, or would that just 
> complicate things?
> 
> Tnx,
> 
> Ted, KN1CBR
> 
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Re: [Elecraft] KBPF3 mod kit

[Don Wilhelm]

Ted,

On the battery replacement, it is easy, bu consider whether you really 
use the real time clock on the K3 - keeping the clock going during power 
down is its only use.  If you do not use the internal clock, then do not 
bother.


When you have the K3 open, it is an opportune time to replace it, but 
those batteries last a long time in an application when it is only 
keeping the clock chip active (as is the case in the K3).


Compare it to the battery in a computer which does the same function. 
How many times have you had to change the battery in your computer?


73,
Don W3FPR

On 3/13/2017 5:11 PM, Dauer, Edward wrote:

I just ordered the KIO3B and a KBPF3 mod kit for the K3.  The process of 
installing the KBPF3 mod provides access to the small battery under the plastic 
protective cover.  The K3 is about five years old.  Would it be worth replacing 
that battery while I am in there, or do they last essentially forever?  The mod 
will also require removing the Sub Rx.  As I remember, that was the most 
frustrating part of the original build.  I would appreciate any tips on how to 
remove and – especially – replace the Sub Rx with a minimum of cussing.  Would 
removing the right side panel help, or would that just complicate things?


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Re: [Elecraft] KBPF3 mod kit

[Ron D'Eau Claire]

Hello Dale:

One of the significant mechanical changes to the K3S was a battery holder that 
lets the battery lie flat so it can be replaced without pulling the KRX3 
enclosure. Also, lying flat the battery does not need a protective cover.

Yes, the battery lasts a very long time, like the bios battery in your 
computer. All it does is keep the real-time clock running when power is off. 
The battery is unimportant if you don't use the clock. If you do use it or just 
want to have  good battery in place, why not change it after 5 years if you are 
"under the hood" anyway? You need a CR2032 3-V battery.

I would remove the left side panel (the side panel with the handle) along with 
the top cover, Then loosen the two long screws that hold the KRX3 enclosure in 
place and lift it enough to take the battery cover off and replace the battery. 
Having the side off makes it easier to ensure the interface boards between the 
KRX3 module and the RF board are seated when you replace the KRX3 module. With 
a little care you won't have to disconnect the TMP coaxial cables.

Be sure to replace the battery cover. The positive (rim) of the battery can 
short against the bottom of the KRX3 enclosure if it is left off. 

When you replace the side cover, be sure to replace all SEVEN screws, including 
the one near the forward end of the handle. That screw is easily overlooked but 
is essential for proper shielding.

73, Ron AC7AC

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Dauer, 
Edward
Sent: Monday, March 13, 2017 2:12 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KBPF3 mod kit

I just ordered the KIO3B and a KBPF3 mod kit for the K3.  The process of 
installing the KBPF3 mod provides access to the small battery under the plastic 
protective cover.  The K3 is about five years old.  Would it be worth replacing 
that battery while I am in there, or do they last essentially forever?  The mod 
will also require removing the Sub Rx.  As I remember, that was the most 
frustrating part of the original build.  I would appreciate any tips on how to 
remove and – especially – replace the Sub Rx with a minimum of cussing.  Would 
removing the right side panel help, or would that just complicate things?

Tnx,

Ted, KN1CBR

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Re: [Elecraft] KBPF3 mod kit

[GRANT YOUNGMAN]

I don’t think removing the side panel is necessary for these mods.  But it’s 
been a while.  The sub-receiver is actually pretty easy to pull and reinstall. 
Just follow the instructions that come with the mod kits.  I’ve found the best 
way to “sight” the sub receiver re-install is to first target the connector at 
the rear.  It’s easier to see and line up.  The front connector will fall into 
place.  Biggest issue (exacerbated if you have the 2M xvrtr) is keeping the TMP 
cables out of the way while dropping it in.

Be aware that the KBPF3 mod requires installing 3 0603-sized surface mount 
caps.  These things are literally flea sized and NOT easy to deal with if you 
aren’t familiar with handling them.  Elecraft supplies an extra in case you 
lose one.  Best to use a hot air rework tool IMHO, but can be done with a fine 
tipped (ESD-safe) iron.  Either way, I’d suggest liquid flux (if you don’t have 
any) to make it as clean and easy as possible.

Can’t comment on the battery.  Mine’s been in there since 2007, and seems to be 
hanging on just fine.


> On Mar 13, 2017, at 5:11 PM, Dauer, Edward  wrote:
> 
> I just ordered the KIO3B and a KBPF3 mod kit for the K3.  The process of 
> installing the KBPF3 mod provides access to the small battery under the 
> plastic protective cover.  The K3 is about five years old.  Would it be worth 
> replacing that battery while I am in there, or do they last essentially 
> forever?  The mod will also require removing the Sub Rx.  As I remember, that 
> was the most frustrating part of the original build.  I would appreciate any 
> tips on how to remove and – especially – replace the Sub Rx with a minimum of 
> cussing.  Would removing the right side panel help, or would that just 
> complicate things?
> 

Grant NQ5T
K3 #2091, KX3 #8342



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[Elecraft] KBPF3 mod kit

[Dauer, Edward]

I just ordered the KIO3B and a KBPF3 mod kit for the K3.  The process of 
installing the KBPF3 mod provides access to the small battery under the plastic 
protective cover.  The K3 is about five years old.  Would it be worth replacing 
that battery while I am in there, or do they last essentially forever?  The mod 
will also require removing the Sub Rx.  As I remember, that was the most 
frustrating part of the original build.  I would appreciate any tips on how to 
remove and – especially – replace the Sub Rx with a minimum of cussing.  Would 
removing the right side panel help, or would that just complicate things?

Tnx,

Ted, KN1CBR

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Re: [Elecraft] KBPF3 100-400 kHz Modification

[Joe Subich, W4TV]

> If the KBPF3 modification compromises performance elsewhere in the
> coverage, I might be better off using my current approach:  A
> home-brew transverter for 630m coverage with a 10.0 - 10.5 MHz IF
> with home-brew sharp cut off low pass filter ahead of the RF input.

The KBPF3 modification impacts only the 0.5-2.0 MHz section of the
BPF3.  In essence that section of the filter is converted from an
0.5 - 2.0 MHz BPF to a 0.1 - 2.0 MHz BPF.  IIRC when I modeled the
modification with filter design software, the behavior above 1 MHz
showed little or no change while the low frequency response was
substantially better between 100 and 500 KHz.

73,

  ... Joe, W4TV


On 12/27/2015 4:02 PM, Michael Mussler wrote:

I am considering the Elecraft modification to the KBPF3 for 630m coverage on my 
K3. Is there any information published on the band pass filter performance 
before and after the modification?

If the KBPF3 modification compromises performance elsewhere in the coverage, I 
might be better off using my current approach:  A home-brew transverter for 
630m coverage with a 10.0 - 10.5 MHz IF with home-brew sharp cut off low pass 
filter ahead of the RF input.

Mike, AI8Z
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[Elecraft] KBPF3 100-400 kHz Modification

[Michael Mussler]

I am considering the Elecraft modification to the KBPF3 for 630m coverage on my 
K3. Is there any information published on the band pass filter performance 
before and after the modification?

If the KBPF3 modification compromises performance elsewhere in the coverage, I 
might be better off using my current approach:  A home-brew transverter for 
630m coverage with a 10.0 - 10.5 MHz IF with home-brew sharp cut off low pass 
filter ahead of the RF input.

Mike, AI8Z
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[Elecraft] KBPF3 mod

[Benny Aumala]

If you upgraded from KSYN3 to a-model, you got
the old unit obsolete.
Maybe you have KBPF3, too and would like to
modify it to low-frequency.
Needed 0,1uF capacitors are available in obsolete old KSYN3.
You need 3, take 6 to be sure. You may loose one or two.

The 250uF condenser is already soldered in new K3S kits.

Benny OH9NB

---
Avast Antivirus on tarkistanut tämän sähköpostin virusten varalta.
https://www.avast.com/antivirus

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Re: [Elecraft] KBPF3 upgrade kit and instructions [Corrected]

[ke9uw]

Yes, but in my case, I remember any mods already done since my K3 was built.



-
Chuck, KE9UW
--
View this message in context: 
http://elecraft.365791.n2.nabble.com/KBPF3-upgrade-kit-and-instructions-Corrected-tp7604292p7604306.html
Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] KBPF3 upgrade kit and instructions now available

[Joe Subich, W4TV]

However, if you are installing a KBPF3A in an existing K3 you
will still want to add the bypass capacitors to the regulators
on the main board and in the KRX3 if installed.

73,

  ... Joe, W4TV


On 2015-06-25 12:34 AM, Wayne Burdick wrote:


On Jun 24, 2015, at 9:23 PM, Michael Eberle mtebe...@mchsi.com wrote:



Will new orders for the KBPF3 have the modification already done…


Yes. That's the KBPF3A.

Wayne
N6KR




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Re: [Elecraft] KBPF3 upgrade kit and instructions [Corrected]

[Guy Olinger K2AV]

Serial number by itself doesn't by itself reliably indicate what is needed
as prior mods and options already installed bear on what is needed or not.

No way out of brainwork prior to order.

73, Guy K2AV

On Thursday, June 25, 2015, Doug doug49...@gmail.com wrote:

 Amen. I agree. I also would like to be able to put serial number in and
 see what I need or can upgrade

 Sent from my iPhone

  On Jun 25, 2015, at 1:51 PM, ke9uw c-haw...@illinois.edu javascript:;
 wrote:
 
  Hmmm...
  Before I order (and I am anxious to order something), I need to sit down
 and
  check several links on the Elecraft site to figure out what I have and
 what
  I can order to upgrade. And check the forum as well.
  While the Elecraft folks are just hanging out looking for something to do
  :),  I long for an interactive link on the Elecraft site that I can just
  enter my K3 serial number into and it displays all the upgrades that I
 could
  benefit from and why.
 
 
 
  -
  Chuck, KE9UW
  --
  View this message in context:
 http://elecraft.365791.n2.nabble.com/KBPF3-upgrade-kit-and-instructions-Corrected-tp7604292p7604297.html
  Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] KBPF3 upgrade kit and instructions [Corrected]

[Wayne Burdick]

Hi Phil,

The errata were assimilated (er...incorporated :)

73,
Wayne
N6KR

On Jun 25, 2015, at 10:58 AM, Phil Wheeler w...@socal.rr.com wrote:

 Ah, much better, Wayne: It now has all the pages referred to in the errata.  
 BTW, is the errata still pertinent or is it OBE?
 
 73, Phil W7OX
 
 On 6/25/15 9:13 AM, Wayne Burdick wrote:
 The correct instruction sheet is now available on the order page for the 
 KBPF3 mod kit. You may need to hit refresh on your browser to see the 
 corrected link.
 
 73,
 Wayne
 N6KR


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[Elecraft] KBPF3 upgrade kit and instructions [Corrected]

[Wayne Burdick]

The correct instruction sheet is now available on the order page for the KBPF3 
mod kit. You may need to hit refresh on your browser to see the corrected 
link.

73,
Wayne
N6KR



* * *

The long-promised KBPF3 modification kit is now available. It applies to the 
KBPF3, K3 RF board, and optionally to the KRX3 sub receiver. It allows the K3 
or K3S to receive signals in the 100-500 kHz range with good sensitivity.  

For full details on the mod kit, see:

  http://www.elecraft.com/order_form_parts.htm#K3%20Parts

Also see below for an excerpt from my original posting about signals in the 
100-500 kHz range.

* * *

In honor of the FCC's proposed 2200 meter allocation (137 kHz), we decided to 
see if we could improve the K3's receive sensitivity in the 100-500 kHz range. 
This extended coverage is made possible by the new synth (KSYN3A). 

After a lot of digging, we discovered the cause of the wide-band low-frequency 
noise. We also found a way to shift the passband of the KBPF3 lower. 

With a couple of simple modifications, the MDS (minimum discernible signal) can 
be improved by about 25 dB at the low end (100 kHz). Here are some test results 
(preamp off, 400-Hz bandwidth): 

137 kHz -114 dBm FCC's proposed 2200 meter band
160 kHz -117 dBm low end of the Low-Fer band
250 kHz -126 dBm test frequency in the long-wave beacon band
472 kHz -133 dBm 630 meter experimental band

This represents an improvement throughout the range, but especially at the low 
end. I believe -114 dBm MDS should suffice at 137 kHz, given the high band 
noise in this range. 

Another indication of how well the mods work: With no antenna connoted, the 
K3's S-meter now just barely flickers (S1) at 100 kHz. Without the mods, the 
no-antenna S-meter reading could be as high as S7 due to the noise source we've 
now identified (a voltage regulator). (By the way, this regulator noise had no 
impact on frequencies about about 500 kHz.)

...

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Re: [Elecraft] KBPF3 upgrade kit and instructions [Corrected]

[Phil Wheeler]

Ah, much better, Wayne: It now has all the pages 
referred to in the errata.  BTW, is the errata 
still pertinent or is it OBE?


73, Phil W7OX

On 6/25/15 9:13 AM, Wayne Burdick wrote:

The correct instruction sheet is now available on the order page for the KBPF3 mod kit. 
You may need to hit refresh on your browser to see the corrected link.

73,
Wayne
N6KR



* * *

The long-promised KBPF3 modification kit is now available. It applies to the 
KBPF3, K3 RF board, and optionally to the KRX3 sub receiver. It allows the K3 
or K3S to receive signals in the 100-500 kHz range with good sensitivity.

For full details on the mod kit, see:

   http://www.elecraft.com/order_form_parts.htm#K3%20Parts

Also see below for an excerpt from my original posting about signals in the 
100-500 kHz range.

* * *

In honor of the FCC's proposed 2200 meter allocation (137 kHz), we decided to 
see if we could improve the K3's receive sensitivity in the 100-500 kHz range. This 
extended coverage is made possible by the new synth (KSYN3A).

After a lot of digging, we discovered the cause of the wide-band low-frequency 
noise. We also found a way to shift the passband of the KBPF3 lower.

With a couple of simple modifications, the MDS (minimum discernible signal) can 
be improved by about 25 dB at the low end (100 kHz). Here are some test results 
(preamp off, 400-Hz bandwidth):

137 kHz -114 dBm FCC's proposed 2200 meter band
160 kHz -117 dBm low end of the Low-Fer band
250 kHz -126 dBm test frequency in the long-wave beacon band
472 kHz -133 dBm 630 meter experimental band

This represents an improvement throughout the range, but especially at the low 
end. I believe -114 dBm MDS should suffice at 137 kHz, given the high band 
noise in this range.

Another indication of how well the mods work: With no antenna connoted, the 
K3's S-meter now just barely flickers (S1) at 100 kHz. Without the mods, the 
no-antenna S-meter reading could be as high as S7 due to the noise source we've 
now identified (a voltage regulator). (By the way, this regulator noise had no 
impact on frequencies about about 500 kHz.)


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Re: [Elecraft] KBPF3 upgrade kit and instructions [Corrected]

[ke9uw]

Hmmm...
Before I order (and I am anxious to order something), I need to sit down and
check several links on the Elecraft site to figure out what I have and what
I can order to upgrade. And check the forum as well.
While the Elecraft folks are just hanging out looking for something to do
:),  I long for an interactive link on the Elecraft site that I can just
enter my K3 serial number into and it displays all the upgrades that I could
benefit from and why.



-
Chuck, KE9UW
--
View this message in context: 
http://elecraft.365791.n2.nabble.com/KBPF3-upgrade-kit-and-instructions-Corrected-tp7604292p7604297.html
Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] KBPF3 upgrade kit and instructions [Corrected]

[Doug]

Amen. I agree. I also would like to be able to put serial number in and see 
what I need or can upgrade 

Sent from my iPhone

 On Jun 25, 2015, at 1:51 PM, ke9uw c-haw...@illinois.edu wrote:
 
 Hmmm...
 Before I order (and I am anxious to order something), I need to sit down and
 check several links on the Elecraft site to figure out what I have and what
 I can order to upgrade. And check the forum as well.
 While the Elecraft folks are just hanging out looking for something to do
 :),  I long for an interactive link on the Elecraft site that I can just
 enter my K3 serial number into and it displays all the upgrades that I could
 benefit from and why.
 
 
 
 -
 Chuck, KE9UW
 --
 View this message in context: 
 http://elecraft.365791.n2.nabble.com/KBPF3-upgrade-kit-and-instructions-Corrected-tp7604292p7604297.html
 Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] KBPF3 upgrade kit and instructions [Corrected]

[N2TK, Tony]

And Jean-Luk,  where is 7 of 9?
N2TK, Tony

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Wayne
Burdick
Sent: Thursday, June 25, 2015 5:20 PM
To: Phil Wheeler
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KBPF3 upgrade kit and instructions [Corrected]

Hi Phil,

The errata were assimilated (er...incorporated :)

73,
Wayne
N6KR

On Jun 25, 2015, at 10:58 AM, Phil Wheeler w...@socal.rr.com wrote:

 Ah, much better, Wayne: It now has all the pages referred to in the
errata.  BTW, is the errata still pertinent or is it OBE?
 
 73, Phil W7OX
 
 On 6/25/15 9:13 AM, Wayne Burdick wrote:
 The correct instruction sheet is now available on the order page for the
KBPF3 mod kit. You may need to hit refresh on your browser to see the
corrected link.
 
 73,
 Wayne
 N6KR


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[Elecraft] KBPF3 upgrade kit and instructions now available

[Wayne Burdick]

Hi all,

The long-promised KBPF3 modification kit is now available. It applies to the 
KBPF3, K3 RF board, and optionally to the KRX3 sub receiver. It allows the K3 
or K3S to receive signals in the 100-500 kHz range with good sensitivity. This 
is an interesting part of the spectrum, with 

For full details on the mod kit, see:

   http://www.elecraft.com/order_form_parts.htm#K3%20Parts

Also see below for an excerpt from my original posting about signals in the 
100-500 kHz range.

73,
Wayne
N6KR


* * *

In honor of the FCC's proposed 2200 meter allocation (137 kHz), we decided to 
see if we could improve the K3's receive sensitivity in the 100-500 kHz range. 
This extended coverage is made possible by the new synth (KSYN3A). 

After a lot of digging, we discovered the cause of the wide-band low-frequency 
noise. We also found a way to shift the passband of the KBPF3 lower. 

With a couple of simple modifications, the MDS (minimum discernible signal) can 
be improved by about 25 dB at the low end (100 kHz). Here are some test results 
(preamp off, 400-Hz bandwidth): 

137 kHz -114 dBm FCC's proposed 2200 meter band
160 kHz -117 dBm low end of the Low-Fer band
250 kHz -126 dBm test frequency in the long-wave beacon band
472 kHz -133 dBm 630 meter experimental band

This represents an improvement throughout the range, but especially at the low 
end. I believe -114 dBm MDS should suffice at 137 kHz, given the high band 
noise in this range. 

Another indication of how well the mods work: With no antenna connoted, the 
K3's S-meter now just barely flickers (S1) at 100 kHz. Without the mods, the 
no-antenna S-meter reading could be as high as S7 due to the noise source we've 
now identified (a voltage regulator). (By the way, this regulator noise had no 
impact on frequencies about about 500 kHz.)

...

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Re: [Elecraft] KBPF3 upgrade kit and instructions now available

[Joe Subich, W4TV]

Neither the instructions nor the errata speak to the regulator bypass
in the KRX3.  The instructions do not provide information in either
bypass.

73,

  ... Joe, W4TV


On 2015-06-24 8:42 PM, Wayne Burdick wrote:

Hi all,

The long-promised KBPF3 modification kit is now available. It applies to the 
KBPF3, K3 RF board, and optionally to the KRX3 sub receiver. It allows the K3 
or K3S to receive signals in the 100-500 kHz range with good sensitivity. This 
is an interesting part of the spectrum, with

For full details on the mod kit, see:

http://www.elecraft.com/order_form_parts.htm#K3%20Parts

Also see below for an excerpt from my original posting about signals in the 
100-500 kHz range.

73,
Wayne
N6KR


* * *

In honor of the FCC's proposed 2200 meter allocation (137 kHz), we decided to 
see if we could improve the K3's receive sensitivity in the 100-500 kHz range. This 
extended coverage is made possible by the new synth (KSYN3A).

After a lot of digging, we discovered the cause of the wide-band low-frequency 
noise. We also found a way to shift the passband of the KBPF3 lower.

With a couple of simple modifications, the MDS (minimum discernible signal) can 
be improved by about 25 dB at the low end (100 kHz). Here are some test results 
(preamp off, 400-Hz bandwidth):

137 kHz -114 dBm FCC's proposed 2200 meter band
160 kHz -117 dBm low end of the Low-Fer band
250 kHz -126 dBm test frequency in the long-wave beacon band
472 kHz -133 dBm 630 meter experimental band

This represents an improvement throughout the range, but especially at the low 
end. I believe -114 dBm MDS should suffice at 137 kHz, given the high band 
noise in this range.

Another indication of how well the mods work: With no antenna connoted, the 
K3's S-meter now just barely flickers (S1) at 100 kHz. Without the mods, the 
no-antenna S-meter reading could be as high as S7 due to the noise source we've 
now identified (a voltage regulator). (By the way, this regulator noise had no 
impact on frequencies about about 500 kHz.)

...

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Re: [Elecraft] KBPF3 upgrade kit and instructions now available

[Michael Eberle]

Will new orders for the KBPF3 have the modification already done or 
would one need to purchase both the KBPF3 and the KBPF3MDKT if they 
wanted to receive 100-500 kHz?


Mike
KI0HA

On 6/24/2015 7:42 PM, Wayne Burdick wrote:

Hi all,

The long-promised KBPF3 modification kit is now available. It applies to the 
KBPF3, K3 RF board, and optionally to the KRX3 sub receiver. It allows the K3 
or K3S to receive signals in the 100-500 kHz range with good sensitivity. This 
is an interesting part of the spectrum, with

For full detailms on the mod kit, see:

http://www.elecraft.com/order_form_parts.htm#K3%20Parts

Also see below for an excerpt from my original posting about signals in the 
100-500 kHz range.

73,
Wayne
N6KR





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Re: [Elecraft] KBPF3 upgrade kit and instructions now available

[Wayne Burdick]

On Jun 24, 2015, at 9:23 PM, Michael Eberle mtebe...@mchsi.com wrote:

 
 Will new orders for the KBPF3 have the modification already done…

Yes. That's the KBPF3A.

Wayne
N6KR




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Re: [Elecraft] KBPF3 General Coverage Receiver -- Main or Subreceiver

[Carl Jón Denbow]

Thanks to everyone who responded to my query -- both on and off the 
list.  My hand has actually been forced a little on this issue, as the 
KRX3 had a bad female TMP connection.  It appeared distorted in shape 
when I tried to replace the male connector.  I then took the cover off 
the KRX3 and discovered that the TMP female in question had never been 
installed correctly and was actually a clear open.  Some other aspects 
of the board looked questionable to me, so I'm going to return it to 
Elecraft for a repair and complete checkout.  So far, everything else in 
the rig seems to check out OK, though I haven't finished the shakedown 
cruise yet.  I'm also going to contact the seller and see if he'll pay 
for the Elecraft repair.   The unit was advertised on QTH.com as being 
in excellent working and cosmetic condition.   The one board seems to 
have been otherwise, as I do not see how the second receiver could have 
worked with all of its functions with one TMP coaxial connector 
basically MIA.


73,

Carl

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

c...@n8vz.com
www.n8vz.com
EM89wh

IRLP 4533   Echolink 116070

PSK and JT65 Forever!
=

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[Elecraft] KBPF3 General Coverage Receiver -- Main or Subreceiver install

[Carl Jón Denbow]

Just back from Dayton with my new-to-me, used K3, SN 7561.  I'm in the 
process of installing the KBPF3 and wondered if it is better installed 
in the  sub-receiver (which this unit has), or on the main board for the 
main receiver.  I'd appreciate any quick responses that a knowledgeable 
ham could make to this inquiry.  As I have the K3 open at this point, 
and would like to finish installing this board ASAP, so I can actually 
try out the rig for the first time.  I decided to install this board and 
the TCXO that I ordered before making all of the connections to my 
KAT500 and KPA500, antenna,  power, etc.   But now I'm suffering from 
I-need-to-try-out-my-new-rig anxiety as my install is at a screeching 
halt as I ponder this question. Help please!


Tnxs  73,

Carl

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

c...@n8vz.com
www.n8vz.com
EM89wh

IRLP 4533   Echolink 116070

PSK and JT65 Forever!
=

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Re: [Elecraft] KBPF3 General Coverage Receiver -- Main or Subreceiver

[Bruce Beford]

If you only have 1 bpf module, I'd probably install it in the main, I guess.
I added a second one for my sub RX later. Opinions will probably run on both
sides, but I'd like to hear the arguments one way or the other myself. (not
that it really matters to me- as I said, I have it in both positions.

-Bruce N1RX

K3 #559 (real serial number, not a contest exchange...)

 

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Re: [Elecraft] KBPF3 and KPA500

[Jim Leder (Hotmail)]

Received 3 HD15 M/F gender changers, pulled pin 11 out, attached it the end of 
the KPA500 control cable, and now the KBPF3 and KPA500 work perfect! Should now 
be able to use a receive only antenna on 80. My vertical is OK, but it can be 
noisy.

73 DE K8CXM  ... Jim


From: Jim Leder (Hotmail) 
Sent: Friday, September 13, 2013 6:06 PM
To: Elecraft 
Subject: KBPF3 and KPA500


 I installed a KBPF3 option, and it works OK, mostly. I also have a PR6, so I 
am trying to use the BYPASS connector of the PR6. I have pulled the jumper in 
the PR6, so the BYPASS would would work. And it does, as long as my KPA500 
cable is disconnected. When I connect the KPA500 control cable, it seems power 
is ALWAYS applied to the PR6, rendering the BYPASS not connected. DIGIOUT1 is 
off on all bands, except 6. When I disconnect the KPA500 control cable, all 
works as it should (except the KPA500). What am I missing?


 Jim Bob Buckeye 
AKA
   Jim Leder
K8CXM since 1961
 IBM retiree since 1999
  
There are 10 types of people in this world -- those who understand binary
and those who don't.

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Re: [Elecraft] KBPF3 and KPA500

[Richard Ferch]

As I understand it, the way the PR6 uses the DIGOUT1 connection (pin 11) 
and the way the KPA500 uses the same connection are physically 
incompatible with one another.


The solution is apparently to break the connection on pin 11 to the 
KPA500 - see 
http://elecraft.365791.n2.nabble.com/KPA500-PR6-AUX-Cable-Pin-11-td7558085.html 
.


I believe that if you wanted to use the KPA500's INHIB IN feature, you 
would have to connect the K3's pin 11 to the KPA500, install jumper P2 
in the PR6 and disconnect the control connection from the PR6 to pin 11, 
thus disabling its automatic bypass feature.


73,
Rich VE3KI


K8CXM wrote:


I installed a KBPF3 option, and it works OK, mostly. I also have a

PR6, so I am trying to use the BYPASS connector of the PR6. I have
pulled the jumper in the PR6, so the BYPASS would would work. And it
does, as long as my KPA500 cable is disconnected. When I connect the
KPA500 control cable, it seems power is ALWAYS applied to the PR6,
rendering the BYPASS not connected. DIGIOUT1 is off on all bands,
except 6. When I disconnect the KPA500 control cable, all works as it
should (except the KPA500). What am I missing?
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Re: [Elecraft] KBPF3 and KPA500

[Cady, Fred]

Hi Jim,
This has been mentioned a couple of times with some good trouble shooting by 
somebody last month (I didn't save the email and couldn't track it down in the 
searchable archives).
What he found was there is a connection in the KAT500 that was pulling the 
DIGOUT1 signal low and keeping the PR6 turned on all the time. A couple of fix 
suggestions were made including removing R63 in the KAT500 or clipping pin-11 
in the TX Keying line interrupter (if you are using it). You could also get 
another DE15HD gender changer and clip pin-11 in it and still maintain the amp 
keying line in the KPAK3AUX cable. Or you can just activate the PR6 when you 
want to by supplying it 12V power.
You may want to contact Elecraft Customer Service about the advisability of 
removing R63 or other solutions they may have found.

Cheers,
Fred KE7X

Fred Cady
The Elecraft K3: Design, Configuration and Operation 2nd ed
The Elecraft KX3 - Going for the summit
www.ke7x.com or www.lulu.com
(Working on The Elecraft K-Line: KPA500 and KAT500)

fcady at ieee dot org

 -Original Message-
 From: elecraft-boun...@mailman.qth.net [mailto:elecraft-
 boun...@mailman.qth.net] On Behalf Of Jim Leder (Hotmail)
 Sent: Friday, September 13, 2013 4:06 PM
 To: Elecraft
 Subject: [Elecraft] KBPF3 and KPA500


  I installed a KBPF3 option, and it works OK, mostly. I also have a
 PR6, so I am trying to use the BYPASS connector of the PR6. I have
 pulled the jumper in the PR6, so the BYPASS would would work. And it
 does, as long as my KPA500 cable is disconnected. When I connect the
 KPA500 control cable, it seems power is ALWAYS applied to the PR6,
 rendering the BYPASS not connected. DIGIOUT1 is off on all bands,
 except 6. When I disconnect the KPA500 control cable, all works as it
 should (except the KPA500). What am I missing?


  Jim Bob Buckeye
 AKA
    Jim Leder
 K8CXM since 1961
  IBM retiree since 1999

 There are 10 types of people in this world -- those who understand
 binary
 and those who don't.

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[Elecraft] KBPF3 and KPA500

[Jim Leder (Hotmail)]

 I installed a KBPF3 option, and it works OK, mostly. I also have a PR6, so I 
am trying to use the BYPASS connector of the PR6. I have pulled the jumper in 
the PR6, so the BYPASS would would work. And it does, as long as my KPA500 
cable is disconnected. When I connect the KPA500 control cable, it seems power 
is ALWAYS applied to the PR6, rendering the BYPASS not connected. DIGIOUT1 is 
off on all bands, except 6. When I disconnect the KPA500 control cable, all 
works as it should (except the KPA500). What am I missing?


 Jim Bob Buckeye 
AKA
   Jim Leder
K8CXM since 1961
 IBM retiree since 1999
  
There are 10 types of people in this world -- those who understand binary
and those who don't.

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[Elecraft] KBPF3 General Coverage Receive Option Questions

[Edward R Cole]

N1LQ-Dave:

I have the KBPF3 installed in my main receiver.  I needed it to use 
my K3 down on the 600m band (495-510 KHz), so having it in the main 
radio is necessary for transmitting on 600m using the TEST 
mode.  Probably not a very common usage, but I thought to mention this.


I have the 13-KHz FM filter, 2.8-MHz and 400-Hz CW filter installed 
in the main receiver, so only use the 13-KHz filter for VHF-FM or BC 
AM.  Use of the DSP filter makes the 13-KHz filter a good choice as 
roofing filter, since one can tailor bw using the DSP filter.  Audio 
bw is 4-KHz in any case.


73, Ed - KL7UW

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Re: [Elecraft] KBPF3 General Coverage Receive Option Questions

[kg7vq]

I use the FM filter, because I had it, and it seems to work well. I have
never had the 6 Khz filter to compare it with.



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Re: [Elecraft] KBPF3 General Coverage Receive Option Questions

[Fred Smith]

I have the 6 KHz filter and mine works fine with my general coverage
receiver mounted in the main receiver.

73,
Fred/N0AZZ

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of kg7vq
Sent: Wednesday, February 13, 2013 7:03 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KBPF3 General Coverage Receive Option Questions

I use the FM filter, because I had it, and it seems to work well. I have
never had the 6 Khz filter to compare it with.



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uestions-tp7569874p7569884.html
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[Elecraft] KBPF3 General Coverage Receive Option Questions

[David and Dianne on Comcast]

Hi All,

This month I am celebrating my fifth anniversary with my K3. It has performed 
flawlessly over this time …without a hiccup. My K3 was purchased without the 
KBPF3 option in 2008.

Like many of you, I started my radio adventures in 1962 at the age of 12 as an 
avid SWL. I recently have become interested in SWL'ing once again and though 
international broadcasting is not as it once was, I find cruising these HF 
bands in Rx mode intriguing (probably my attempt to regain an aspect of my 
youth at my now advancing age).

After looking at the vintage general coverage radios available on eBay etc., 
looking specifically for an SX-100 that I once owned 42 years ago (or an 
SX-88in my dreams) most seem either overpriced or in questionable condition 
, I decided to try listening on the K3 in several of the international 
broadcast bands that are near hams bands. Boy was I pleasantly surprised. Using 
the 6 KHz AM filter in my K3, I was rewarded with a great general coverage Rx 
capability and really nice audio.

So I am seriously considering ordering the KBPF3 option to install in my K3. 
Here are my questions:

--Which receiver is it preferable to install the KBPF3 into; the main Rx or the 
sub Rx or does it matter? I do not want to degrade the main receiver 
performance in the ham bands even slightly. And while l strongly suspect it 
does not matter at all, I wanted to ask opinions on this reflector first so I 
can install the thing only once.

Also, do folks using the KBPF3 option prefer to use it with the 6 KHz AM 
roofing filter or the 13 KHz FM roofing filter on SWL AM receive? Any comments 
here would be appreciated.

I think this was mentioned a few years back but I’ll chime in again anyway.

Elecraft could corner the general coverage receiver market by offering an Rx 
version of the K3 (KR3?) targeting SWLs and a like. Once word got out, I 
suspect that they they would dominate that market slice as they are now doing 
with the ham market with the K3 and KX3.

Thanks for any thoughts or suggestions.

73 de N1LQ-Dave
K3# 371

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Re: [Elecraft] KBPF3 General Coverage Receive Option Questions

[Don Wilhelm]

Dave,

Since SW Broadcast signals are subject to fading, I would suggest you 
add the KBPF3 to both the main and the subRX to give you the capability 
of diversity reception.  If you only want to purchase one, I suggest 
that putting it in the main RX would make operation more straightforward 
(just turn off the subRX).


73,
Don W3FPR

On 2/12/2013 6:19 PM, David and Dianne on Comcast wrote:

Hi All,

This month I am celebrating my fifth anniversary with my K3. It has 
performed flawlessly over this time …without a hiccup. My K3 was 
purchased without the KBPF3 option in 2008.


Like many of you, I started my radio adventures in 1962 at the age of 
12 as an avid SWL. I recently have become interested in SWL'ing once 
again and though international broadcasting is not as it once was, I 
find cruising these HF bands in Rx mode intriguing (probably my 
attempt to regain an aspect of my youth at my now advancing age).


After looking at the vintage general coverage radios available on eBay 
etc., looking specifically for an SX-100 that I once owned 42 years 
ago (or an SX-88in my dreams) most seem either overpriced or in 
questionable condition , I decided to try listening on the K3 in 
several of the international broadcast bands that are near hams bands. 
Boy was I pleasantly surprised. Using the 6 KHz AM filter in my K3, I 
was rewarded with a great general coverage Rx capability and really 
nice audio.


So I am seriously considering ordering the KBPF3 option to install in 
my K3. Here are my questions:


--Which receiver is it preferable to install the KBPF3 into; the main 
Rx or the sub Rx or does it matter? I do not want to degrade the main 
receiver performance in the ham bands even slightly. And while l 
strongly suspect it does not matter at all, I wanted to ask opinions 
on this reflector first so I can install the thing only once.


Also, do folks using the KBPF3 option prefer to use it with the 6 KHz 
AM roofing filter or the 13 KHz FM roofing filter on SWL AM receive? 
Any comments here would be appreciated.


I think this was mentioned a few years back but I’ll chime in again 
anyway.


Elecraft could corner the general coverage receiver market by offering 
an Rx version of the K3 (KR3?) targeting SWLs and a like. Once word 
got out, I suspect that they they would dominate that market slice as 
they are now doing with the ham market with the K3 and KX3.


Thanks for any thoughts or suggestions.

73 de N1LQ-Dave
K3# 371

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[Elecraft] KBPF3 coverage

[Merv Schweigert]

Is anyone using the K3 for receive on 500KHZ?

I do not have the KBPF3 installed and of course the K3
is deaf on 500KHZ,  so before I order one, would like
to know if it works down that far in freq.  Or is it
compromise performance compared to a good 500KHZ
receiver?

Thanks  73 Merv K9FD/KH6
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[Elecraft] KBPF3 has been sold

[Chuck Secrest]

Thanks to all who replied.
73,
Chuck NM1G
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[Elecraft] KBPF3 Option - Main and Sub Receiver

[KD4NUE]

I am a new owner, and have much still to learn on this rig.

Do you have to install 2 of the KBPF3 Option boards in order to have both
primary and second reciever have General Coverage Receive filtering?

Mine appears to be installed in the second receiver, and throws an error if
config is set to show it installed in the RF (Primary).

I think the answer will be yes if you are to be able to monitor 2 separate
bands simultaneously, but would like to know for sure..











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Re: [Elecraft] KBPF3 Option - Main and Sub Receiver

[Dick Dievendorff]

Yes, if you want to use both main and sub receivers on frequencies outside
the amateur bands, you'll want two KBPF3 options.

However I find I need just one general-coverage receiver. I have my single
KBPF3 option on the main receiver.  I use the second receiver for diversity
and split frequency operations only on the amateur bands.  

I don't think I'd use a sub receiver KBPF3 very often.

Your needs may well be different than mine. If you want diversity receive
outside the ham bands, you'll want both.

73 de Dick, K6KR


-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of KD4NUE
Sent: Saturday, October 06, 2012 4:50 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KBPF3 Option - Main and Sub Receiver


I am a new owner, and have much still to learn on this rig.

Do you have to install 2 of the KBPF3 Option boards in order to have both
primary and second reciever have General Coverage Receive filtering?

Mine appears to be installed in the second receiver, and throws an error if
config is set to show it installed in the RF (Primary).

I think the answer will be yes if you are to be able to monitor 2 separate
bands simultaneously, but would like to know for sure..











--
View this message in context:
http://elecraft.365791.n2.nabble.com/KBPF3-Option-Main-and-Sub-Receiver-tp75
63771.html
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Re: [Elecraft] KBPF3 Option - Main and Sub Receiver

[Scott Manthe]

Welcome aboard!!

You only need the KBPF3 if you want to listen to frequencies outside the 
amateur bands. My recommendation would be to remove the KBPF3 from the 
KRX3 and move it to the main receiver, but if you want general coverage 
RX in both receivers, then you'd need to install one on both receivers.

The KBPF3 has nothing to do with the K3's ability to listen to two 
separate bands simultaneously, only with general coverage RX, so with 
the K3 with the KRX3 installed, you can monitor six meters on one 
receiver and 160 on the other, if you'd like.

73,
Scott, N9AA


On 10/6/12 7:49 AM, KD4NUE wrote:
 I am a new owner, and have much still to learn on this rig.

 Do you have to install 2 of the KBPF3 Option boards in order to have both
 primary and second reciever have General Coverage Receive filtering?

 Mine appears to be installed in the second receiver, and throws an error if
 config is set to show it installed in the RF (Primary).

 I think the answer will be yes if you are to be able to monitor 2 separate
 bands simultaneously, but would like to know for sure..


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[Elecraft] KBPF3

[Brett Howard]

Maybe I've missed it or forgotten where it was but is it documented
somewhere what the RX performance is with and without the KBPF3?  I've
seen where it says that you get 500Khz-30Mhz and 48-54Mhz but it then
says KBPF3 required for general coverage But how wide are the ham
band filters and what all are the gaps that one are looking at missing.
I really never went and played outside the ham bands on the Kenwood
TS-450Sat that I was borrowing for a while when I was saving up for a
K3... So I wonder what I'm missing out there and figured this would make
a fun K3 related thread that many would have fun sharing in.

~Brett

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[Elecraft] KBPF3 Query

[Brian Alsop]

Guys,

I was wondering just how this works.  Suppose one wants 9 MHz.  Does one 
set the band to 30M and just tune down to it?  Does any of this confuse 
the band selection via buttons?   Alternatively if one sets the 
frequency with the key pad, what band does it appear in.

I seem to recall some unintended consequences reported here a long time ago.

73 de Brian/K3KO
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Re: [Elecraft] KBPF3 Query

[Wes Stewart]

In this case, I just key it in.  The band will change to 30-meters and if you 
cycle through the bands, the next time you hit 30-meters you will be set to 9 
MHz.

BTW, I have my M1-M4 memories set to default frequencies for each band so 
that M1=CW, M2=SSB, M3=Data A (PSK) and M4=AFSK-A (RTTY). So when I get some 
oddball frequency/mode set on a particular band, I can quickly recover to a 
known state.

Wes N7WS

--- On Fri, 2/26/10, Brian Alsop als...@nc.rr.com wrote:

 Guys,
 
 I was wondering just how this works.  Suppose one
 wants 9 MHz.  Does one 
 set the band to 30M and just tune down to it?  Does
 any of this confuse 
 the band selection via
 buttons?   Alternatively if one sets the 
 frequency with the key pad, what band does it appear in.
 
 I seem to recall some unintended consequences reported here
 a long time ago.
 
 73 de Brian/K3KO
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Re: [Elecraft] KBPF3 Query

[Joe Planisky]

Hi Brian,

This came up and was discussed on Nov. 15, 2009 with a thread titled  
K3 Firmware Req for SWL band and Using Memories  Search for that  
thread in the archives to read all the gory details.

The key information that's missing from the documentation is the band  
edges.  I determined them experimentally to be:

160m  0.5 -  2.99 MHz
  80m  3.0 -  4.79 MHz
  60m  4.8 -  5.99 MHz
  40m  6.0 -  8.99 MHz
  30m  9.0 - 12.99 MHz
  20m 13.0 - 16.99 MHz
  17m 17.0 - 18.99 MHz
  15m 19.0 - 22.99 MHz
  12m 23.0 - 25.99 MHz
  10m 26.0 - 30.00 MHz
   6m 44.0 - 54.00 MHz

To answer your specific questions:

 Suppose one wants 9 MHz.  Does one
 set the band to 30M and just tune down to it?

You can, but I usually punch in the frequency I want, or one close to  
it and tune from there.  E.g. if I wanted 9 MHz, I punch that in: FREQ  
ENT  9  AFX (the AFX key is also the ENTER key).

 Does any of this confuse
 the band selection via buttons?

No.  Not as long as you keep in mind the table above.  If you're at 9  
MHz, you're on the 30m band.  If you then go to 15 MHz, you've  
switched to the 20m band.

 Alternatively if one sets the
 frequency with the key pad, what band does it appear in.

See the table above.

73
--
Joe KB8AP



On Feb 26, 2010, at 7:35 AM, Brian Alsop wrote:

 Guys,

 I was wondering just how this works.  Suppose one wants 9 MHz.  Does  
 one
 set the band to 30M and just tune down to it?  Does any of this  
 confuse
 the band selection via buttons?   Alternatively if one sets the
 frequency with the key pad, what band does it appear in.

 I seem to recall some unintended consequences reported here a long  
 time ago.

 73 de Brian/K3KO
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Re: [Elecraft] KBPF3 usefulness or effectiveness?

[Stephen Prior]

James

I suspect that 7.5MHz is far too close to the existing 40m bandpass
filtering for you to notice any difference between it and the KBPF3. I can't
try it here as I only have the single receiver, but if you to look around
12MHz for example I expect you would detect a significant difference.

73 Stephen G4SJP
K3 #980


On 28/12/2009 02:19, James Sarte k2qi@gmail.com wrote:

 
 Hello Elecrafters,
 
 When I assembled my K3 I installed the KBPF3 module in the sub receiver
 figuring that I'd use the sub for SWL.  However, I was thinking about moving
 it back to the main receiver in order to take full advantage of the
 synchronous AM detection feature.  What I noticed though was that I can't
 really seem to tell if the KBPF3 makes a difference when listening to
 out-of-band stations.
 
 For example, tuning around tonight I came across a strong SW station on 7505
 KHz.  Logic tells me that the sub receiver's AF output should be
 significantly clearer, perhaps louder, than that of the main receiver.
 Going back and forth between them doesn't seem to show any differences in
 perceived audio quality though.
 
 So, I'm curious now if there are any tests I can perform that would
 demonstrate the effectiveness of the KBPF3 module.
 
 Thank you for your valued input.
 
 Vy 73 de James K2QI




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Re: [Elecraft] KBPF3 usefulness or effectiveness?

[James Sarte]

Thanks Dave - I had forgotten about the broadcast AM stations below 1 kc.
I'll check that out.  

By the way (and this is addressed to Wayne), any chance sync-am can be
applied to the sub receiver?

73 de James K2QI

-Original Message-
From: David Olean [mailto:k1...@metrocast.net]
Sent: Sunday, December 27, 2009 11:08 PM
To: James Sarte
Subject: Re: [Elecraft] KBPF3 usefulness or effectiveness?

I do know that it makes a big difference on the broadcast band. Tune in a
station under 1000 kHz. It will be much louder on the antenna in jack on the

KXV3 than on the main antenna jack.  7500kHz might not be far enuf away from

the ham band to make much difference. I noted a big improvement on the BC
band  with the KBPF3 over that without it.  Easy to check there with plenty
of stations.

Dave K1WHS

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Re: [Elecraft] KBPF3 usefulness or effectiveness?

[Guy Olinger K2AV]

If the AGC is being used, any difference would be seen in the S-meter,
not the AF output, unless you live in an extremely quiet location and
you're trying to copy 40m BC during the day.

My KBPF3 switches in at 7.385. If you turn the AF gains to minimum in
a quiet room, you will hear the relay kick in/out the KBPF3 as you
tune across the switch-in points. Mine switches before the ham band
filter adds any noticeable loss, as there is no sudden change in any
level.  Very smooth.

Were you having trouble hearing a station or just curious about the
way it operates?

73, Guy.

On Mon, Dec 28, 2009 at 3:56 AM, Stephen  Prior s...@sjprior.fsnet.co.uk 
wrote:
 James

 I suspect that 7.5MHz is far too close to the existing 40m bandpass
 filtering for you to notice any difference between it and the KBPF3. I can't
 try it here as I only have the single receiver, but if you to look around
 12MHz for example I expect you would detect a significant difference.

 73 Stephen G4SJP
 K3 #980


 On 28/12/2009 02:19, James Sarte k2qi@gmail.com wrote:


 Hello Elecrafters,

 When I assembled my K3 I installed the KBPF3 module in the sub receiver
 figuring that I'd use the sub for SWL.  However, I was thinking about moving
 it back to the main receiver in order to take full advantage of the
 synchronous AM detection feature.  What I noticed though was that I can't
 really seem to tell if the KBPF3 makes a difference when listening to
 out-of-band stations.

 For example, tuning around tonight I came across a strong SW station on 7505
 KHz.  Logic tells me that the sub receiver's AF output should be
 significantly clearer, perhaps louder, than that of the main receiver.
 Going back and forth between them doesn't seem to show any differences in
 perceived audio quality though.

 So, I'm curious now if there are any tests I can perform that would
 demonstrate the effectiveness of the KBPF3 module.

 Thank you for your valued input.

 Vy 73 de James K2QI




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Re: [Elecraft] KBPF3 usefulness or effectiveness?

[drewko]

FWIW, mine switches in at 7410 KHz, increasing the signal by 7 or 8
dB. I compared the background noise level below and above 7410 using
the K3's internal dBV function, with AGC off.

73,
Drew
AF2Z





On Mon, 28 Dec 2009 11:26:04 -0500, Guy. wrote:

If the AGC is being used, any difference would be seen in the S-meter,
not the AF output, unless you live in an extremely quiet location and
you're trying to copy 40m BC during the day.

My KBPF3 switches in at 7.385. If you turn the AF gains to minimum in
a quiet room, you will hear the relay kick in/out the KBPF3 as you
tune across the switch-in points. Mine switches before the ham band
filter adds any noticeable loss, as there is no sudden change in any
level.  Very smooth.

Were you having trouble hearing a station or just curious about the
way it operates?

73, Guy.


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Re: [Elecraft] KBPF3 usefulness or effectiveness?

[James Sarte]

Hi Guy et al,

I was more or less curious about how it worked.  I do hear a relay clicking
somewhere around 7400 kHz, but I do not recall seeing or hearing an
appreciable change in s-meter readings or AF levels.

I'm sure it works fine in the lower broadcast bands though.

James K2QI

On Mon, Dec 28, 2009 at 11:26 AM, Guy Olinger K2AV olin...@bellsouth.netwrote:

 If the AGC is being used, any difference would be seen in the S-meter,
 not the AF output, unless you live in an extremely quiet location and
 you're trying to copy 40m BC during the day.

 My KBPF3 switches in at 7.385. If you turn the AF gains to minimum in
 a quiet room, you will hear the relay kick in/out the KBPF3 as you
 tune across the switch-in points. Mine switches before the ham band
 filter adds any noticeable loss, as there is no sudden change in any
 level.  Very smooth.

 Were you having trouble hearing a station or just curious about the
 way it operates?

 73, Guy.

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[Elecraft] KBPF3 usefulness or effectiveness?

[James Sarte]

Hello Elecrafters,

When I assembled my K3 I installed the KBPF3 module in the sub receiver
figuring that I'd use the sub for SWL.  However, I was thinking about moving
it back to the main receiver in order to take full advantage of the
synchronous AM detection feature.  What I noticed though was that I can't
really seem to tell if the KBPF3 makes a difference when listening to
out-of-band stations.

For example, tuning around tonight I came across a strong SW station on 7505
KHz.  Logic tells me that the sub receiver's AF output should be
significantly clearer, perhaps louder, than that of the main receiver.
Going back and forth between them doesn't seem to show any differences in
perceived audio quality though.

So, I'm curious now if there are any tests I can perform that would
demonstrate the effectiveness of the KBPF3 module.

Thank you for your valued input.

Vy 73 de James K2QI

-- 
73 de James K2QI
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[Elecraft] KBPF3 Gen Coverage Rcvr 4 K3

[H. Cary III]

FOR SALE:  KBPF-3 General Coverage Receiver module for K3.  New from Aptos, it 
is $129.95; yours for $95 and I ship CONUS.  Contact off list, please:  [EMAIL 
PROTECTED]
73,
Cary, K4TM



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[Elecraft] KBPF3

[Charles Harpole]

When I ordered my K3 and accessories I did not order the KBPF3  because I thot 
that was to add general coverage receive Now, I am thinking it is a 
bandpass filter to filter OUT non-ham band signals.  That I need, so another 
order if my latter idea is correct.
What is the function of the KBPF3?  Do u need one for both main and sub 
receivers?73Charles [EMAIL PROTECTED]  From: [EMAIL PROTECTED] To: [EMAIL 
PROTECTED]; [EMAIL PROTECTED] Subject: RE: [Elecraft] Filter question Date: 
Mon, 18 Feb 2008 15:04:44 -0800 CC: elecraft@mailman.qth.net  Does the KBPF3 
go into the RX module or the main board module? Ie do you need two if you have 
the dual receivers? You probably wouldn't need dual RX out of band but just a 
wonder I guess the band passes would have to be on the RX modules or you 
wouldn't be able to get the two RX modules onto frequencies on two separate 
bands True?  -Original Message- From: [EMAIL PROTECTED] 
[mailto:[EMAIL PROTECTED] On Behalf Of Mark Bayern Sent: Monday, February 18, 
2008 1:55 PM To: Bill Kimura Cc: elecraft@mailman.qth.net Subject: Re: 
[Elecraft] Filter question  From the K3 FAQs (see 
http://www.elecraft.com/K3/K3FAQ.htm)    Q: I'm still not clear on 
the general-coverage (GC) receive option -- if it is indeed optional or 
available by default in a minimally configured radio.  The basic radio, as 
well as the subreceiver, has a full array of ham-band-only filters at the 
front end. This is to ensure excellent performance in the ham bands. These 
filters are switched in by means of relays.  The KBPF3 option is a small 
plug-in module that sits above the ham-band filters. It, too, has a number of 
filters switched in by relays. The difference is that these are wider filters, 
covering all of the area between the ham bands. But they share the same 
input/output path as the ham-band filters. When not selected, the GC filters 
have absolutely no effect on performance, thanks to a very careful layout that 
minimizes trace lengths. When you tune the radio well outside the ham bands, 
an appropriate GC filter is automatically selected by firmware.    
Hopes this helps -- at least with your KBPF3 question.   Mark AD5SS 
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Re: [Elecraft] KBPF3

[dj7mgq]

Hi Charles,

When I ordered my K3 and accessories I did not order the KBPF3
because I thot that was to add general coverage receive


Correct.

Now, I am thinking it is a bandpass filter to filter OUT non-ham  
band  signals.


No. It is a filter to allow non-ham frequencies.



What is the function of the KBPF3?


Take a look at:

http://www.elecraft.com/K3/K3FAQ.htm#KBPF3
How is the KBPF3 bandpass filter used...

http://www.elecraft.com/K3/K3FAQ.htm#Subreceiver
I'm still not clear on the general-coverage (GC) receive option...

http://www.nabble.com/The-KBPF3-is-not-a-roofing-filterit%27s-an-RF-band-pass-filter-module-to13820837.html#a13820837
The KBPF3 is not a roofing filter...

http://www.nabble.com/KBPF3-frequency-range-to14085227.html#a14085228
KBPF3 frequency range...

http://www.nabble.com/Ham-bands-vs-GC-receive-to14075801.html#a14075839
Ham bands vs GC receive...

etc. etc. etc.



Do u need one for both main and sub receivers?


If you want good sensitivity outside of the ham bands on both receivers, yes.

If you want good sensitivity outside of the ham bands on one RX, you  
only need one KBPF3.


If you are only want good sensitivity within the Ham bands, you do not  
need the KBPF3.



vy 73 de toby

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RE: [Elecraft] KBPF3 answer

[Charles Harpole]

Great advice response and vy clear Answer is no the KBPF3 does not help 
the ham bands.
 
So, it is not a band pass filter in the usual sense of an ICE 419 which rejects 
sigs outside one ham band (switchable).  BIG thanks  73Charles [EMAIL 
PROTECTED]  Date: Tue, 19 Feb 2008 11:26:02 +0100 From: [EMAIL PROTECTED] 
To: [EMAIL PROTECTED] CC: [EMAIL PROTECTED]; [EMAIL PROTECTED]; [EMAIL 
PROTECTED]; elecraft@mailman.qth.net Subject: Re: [Elecraft] KBPF3  Hi 
Charles,   When I ordered my K3 and accessories I did not order the KBPF3  
 because I thot that was to add general coverage receive  Correct.   
Now, I am thinking it is a bandpass filter to filter OUT non-ham   band 
signals.  No. It is a filter to allow non-ham frequencies.What is the 
function of the KBPF3?  Take a look at:  
http://www.elecraft.com/K3/K3FAQ.htm#KBPF3 How is the KBPF3 bandpass filter 
used...  http://www.elecraft.com/K3/K3FAQ.htm#Subreceiver I'm still not 
clear on the general-coverage (GC) receive option...  
http://www.nabble.com/The-KBPF3-is-not-a-roofing-filterit%27s-an-RF-band-pass-filter-module-to13820837.html#a13820837
 The KBPF3 is not a roofing filter...  
http://www.nabble.com/KBPF3-frequency-range-to14085227.html#a14085228 KBPF3 
frequency range...  
http://www.nabble.com/Ham-bands-vs-GC-receive-to14075801.html#a14075839 Ham 
bands vs GC receive...  etc. etc. etc.Do u need one for both main and 
sub receivers?  If you want good sensitivity outside of the ham bands on both 
receivers, yes.  If you want good sensitivity outside of the ham bands on one 
RX, you  only need one KBPF3.  If you are only want good sensitivity within 
the Ham bands, you do not  need the KBPF3.   vy 73 de toby 
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[Elecraft] KBPF3 frequency range

[Nelson Wittstock]

I'm considering adding a KBPF3 to my growing order list but I am curious as 
to what is the range of frequencies that are covered with this filter.  Did 
I miss seeing it when I searched the Elecraft site?


Nelson, K8DJC 



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