Date   
Re: CW Noise Pedestal

Clay Autery
 

Nope... that is not what I meant.  But I get your point.  A lot of BS gets spread in audio circles...

______________________
Clay Autery, KY5G
(318) 518-1389
On 01/20/20 13:46, Wes Stewart via Groups.Io wrote:

If you buy the Elecraft mod kit I suspect you get "any old electrolytic" capacitor.  If by audio people you mean the ones who can tell the sonic differences between regular copper and HCOF copper speaker cables I wouldn't worry about what they think.

Wes  N7WS


On Monday, January 20, 2020, 11:34:33 AM MST, Clay Autery <ky5g@...> wrote:


Replying to my own post... sorry....

I don't think I will personally just throw any old 470uF 16V electrolytic capacitor in there.  I think I will dig into the schematics a bit and try to figure out for what the cap is being introduced into the circuit.
Bulk, smoothing, response?  Other?

For instance, in audio applications, folks congregate around Elna SILMIC II series electrolytics for "smoothing"purposes...
I don't pretend to know ANYTHING about this, but it is an opportunity to learn.

73,

______________________
Clay Autery, KY5G
(318) 518-1389
On 01/20/20 12:23, Clay Autery wrote:

HERE is the Introduction to the Mod Alert:

Elecraft      •      www.elecraft.com     •     831-763-4211Elecraft KPAIO3MDKT

Installation Instructions
Revision B, August 10, 2016E740287Copyright © 2016, Elecraft, Inc.All Rights Reserved

Introduction

This modification applies only to K3S transceivers equipped with the KPA3A 100 watt power amplifier, serial numbers 10732 (factory assembled), 10728 (kits) or below, and to all K3 transceivers with the KPA3 power amplifier that have been upgraded with KSYN3A synthesizers.Tests at Elecraft have shown that a very small amount of electrical noise associated with the fans on the KPA3 (or KPA3A) amplifier module can be detected in the transmitted signal under laboratory test conditions. This modification suppresses that noise. The noise had always been present, but was only discovered with the addition of the new KSYN3A synthesizer, due to its extremely low phase noise close to the carrier. This modification was phased into factory assembled units starting with serial number 10732 and kits starting with serial number 10728. This modification kit allows you to make the simple change in the field to an existing K3 or K3S. It requires removing the KPAIO3 interface board and soldering a leaded capacitor supplied onto the board.

https://ftp.elecraft.com/K3/Manuals%20Downloads/E740287%20KPAIO3MDKT%20Instructions.pdf

YOU need the mod if the "small amount of noise" present under "lab conditions" bothers you.
I am applying it because I do everything reasonable to make my transmissions cleaner.  It is a matter of being a "good neighbor" on the public airways for me.

73,

______________________
Clay Autery, KY5G
(318) 518-1389
On 01/20/20 11:43, Russ Tobolic via Groups.Io wrote:
Now I am all confused!  I have good old trusty K3 serial #732 with the original KPA3 and upgraded with the KSYN3A.  This is the first time I have heard of this mod so do I need it? No one has told me I have a problem.   I have a handful of the 470uF caps in my junk box.

Russ, N3CO

Re: CW Noise Pedestal

Bob McGraw - K4TAX
 

There is an Elecraft published procedure, E740287, Rev B dated August 10, 2016 that has the description and pictures of how and where the capacitor is to be installed.   Based on pictures and description,  the capacitor is a 470 MFD 16 VDC radial lead electrolytic.

Per the document, radios S/N 10732 (factory assembled) and 10728 (kits) or below are affected and to ALL K3 transceivers with the KPA3 power amplifier that have been upgraded with KSYN3A synthesizers.

This modification was phased into factory assembled units starting with serial number 10732 and kits starting with serial number 10728.

73

Bob, K4TAX


On 1/20/2020 2:41 PM, Rob Sherwood wrote:

A DC fan, brushless or not, creates noise that gets back into the radio.  For decades I sold a cooling kit for the Icom IC-781, and I had a small dropping resistor (since the available supply voltage was 15 volts), plus a 470 uF electrolytic.  This isn’t an exotic circuit for the K3 or the IC-781.  In my case I ran the fan on 9 volts, and in the case of the K3 there are step-wise variable speeds.  I am sure size matters, but today a 470 uF at 16 or 25 volts is quite small compared to years ago.  Rob, NC0B

 

From: Elecraft-K3@groups.io [mailto:Elecraft-K3@groups.io] On Behalf Of Clay Autery
Sent: Monday, January 20, 2020 11:34 AM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] CW Noise Pedestal

 

Replying to my own post... sorry....

I don't think I will personally just throw any old 470uF 16V electrolytic capacitor in there.  I think I will dig into the schematics a bit and try to figure out for what the cap is being introduced into the circuit.
Bulk, smoothing, response?  Other?

For instance, in audio applications, folks congregate around Elna SILMIC II series electrolytics for "smoothing"purposes...
I don't pretend to know ANYTHING about this, but it is an opportunity to learn.

73,

______________________
Clay Autery, KY5G
(318) 518-1389

On 01/20/20 12:23, Clay Autery wrote:

HERE is the Introduction to the Mod Alert:

Elecraft      •      www.elecraft.com     •     831-763-4211Elecraft KPAIO3MDKT

Installation Instructions
Revision B, August 10, 2016E740287Copyright © 2016, Elecraft, Inc.All Rights Reserved

Introduction

This modification applies only to K3S transceivers equipped with the KPA3A 100 watt power amplifier, serial numbers 10732 (factory assembled), 10728 (kits) or below, and to all K3 transceivers with the KPA3 power amplifier that have been upgraded with KSYN3A synthesizers.Tests at Elecraft have shown that a very small amount of electrical noise associated with the fans on the KPA3 (or KPA3A) amplifier module can be detected in the transmitted signal under laboratory test conditions. This modification suppresses that noise. The noise had always been present, but was only discovered with the addition of the new KSYN3A synthesizer, due to its extremely low phase noise close to the carrier. This modification was phased into factory assembled units starting with serial number 10732 and kits starting with serial number 10728. This modification kit allows you to make the simple change in the field to an existing K3 or K3S. It requires removing the KPAIO3 interface board and soldering a leaded capacitor supplied onto the board.

https://ftp.elecraft.com/K3/Manuals%20Downloads/E740287%20KPAIO3MDKT%20Instructions.pdf

YOU need the mod if the "small amount of noise" present under "lab conditions" bothers you.
I am applying it because I do everything reasonable to make my transmissions cleaner.  It is a matter of being a "good neighbor" on the public airways for me.

73,

______________________
Clay Autery, KY5G
(318) 518-1389

On 01/20/20 11:43, Russ Tobolic via Groups.Io wrote:

Now I am all confused!  I have good old trusty K3 serial #732 with the original KPA3 and upgraded with the KSYN3A.  This is the first time I have heard of this mod so do I need it? No one has told me I have a problem.   I have a handful of the 470uF caps in my junk box.

Russ, N3CO

Re: CW Noise Pedestal

Rob Sherwood
 

I don’t know, but a 16 volt electrolytic would meet the Elecraft voltage spec.  A 25 volt cap wouldn’t be that much larger, but I don’t know the mechanicals involved.  I didn’t find any temperature data in the manual except for the PA and front panel.  Rob, NC0B

 

From: Elecraft-K3@groups.io [mailto:Elecraft-K3@groups.io] On Behalf Of Richard Smith
Sent: Monday, January 20, 2020 11:49 AM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] CW Noise Pedestal

 

What are the other specs for the cap, voltage, temp, etc?   Thanks.  RAS



On Jan 20, 2020, at 12:15 PM, Rob Sherwood <rob@...> wrote:

 

Your neighbor or Field Day!  For the price of a 470 uF capacitor, why not do it?   Rob, NC0B

 

From: Elecraft-K3@groups.io [mailto:Elecraft-K3@groups.io] On Behalf Of Drew Vonada-Smith K3PA
Sent: Monday, January 20, 2020 11:09 AM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] CW Noise Pedestal

 

It is the kind of thing only your neighbor is likely to hear.

 

Re: CW Noise Pedestal

Michael Harris <mike.harris@...>
 

Mine is a 470uf, 16V, 85C no name item, unless a little square with an M in it is a manufacture. Looking at the schematic, it is installed across the supply to the fans.

Regards,

Mike VP8NO

On 20/01/2020 16:46, Wes Stewart via Groups.Io wrote:
If you buy the Elecraft mod kit I suspect you get "any old electrolytic" capacitor.  If by audio people you mean the ones who can tell the sonic differences between regular copper and HCOF copper speaker cables I wouldn't worry about what they think.
Wes  N7WS

Re: CW Noise Pedestal

Rob Sherwood
 

A DC fan, brushless or not, creates noise that gets back into the radio.  For decades I sold a cooling kit for the Icom IC-781, and I had a small dropping resistor (since the available supply voltage was 15 volts), plus a 470 uF electrolytic.  This isn’t an exotic circuit for the K3 or the IC-781.  In my case I ran the fan on 9 volts, and in the case of the K3 there are step-wise variable speeds.  I am sure size matters, but today a 470 uF at 16 or 25 volts is quite small compared to years ago.  Rob, NC0B

 

From: Elecraft-K3@groups.io [mailto:Elecraft-K3@groups.io] On Behalf Of Clay Autery
Sent: Monday, January 20, 2020 11:34 AM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] CW Noise Pedestal

 

Replying to my own post... sorry....

I don't think I will personally just throw any old 470uF 16V electrolytic capacitor in there.  I think I will dig into the schematics a bit and try to figure out for what the cap is being introduced into the circuit.
Bulk, smoothing, response?  Other?

For instance, in audio applications, folks congregate around Elna SILMIC II series electrolytics for "smoothing"purposes...
I don't pretend to know ANYTHING about this, but it is an opportunity to learn.

73,

______________________
Clay Autery, KY5G
(318) 518-1389

On 01/20/20 12:23, Clay Autery wrote:

HERE is the Introduction to the Mod Alert:

Elecraft      •      www.elecraft.com     •     831-763-4211Elecraft KPAIO3MDKT

Installation Instructions
Revision B, August 10, 2016E740287Copyright © 2016, Elecraft, Inc.All Rights Reserved

Introduction

This modification applies only to K3S transceivers equipped with the KPA3A 100 watt power amplifier, serial numbers 10732 (factory assembled), 10728 (kits) or below, and to all K3 transceivers with the KPA3 power amplifier that have been upgraded with KSYN3A synthesizers.Tests at Elecraft have shown that a very small amount of electrical noise associated with the fans on the KPA3 (or KPA3A) amplifier module can be detected in the transmitted signal under laboratory test conditions. This modification suppresses that noise. The noise had always been present, but was only discovered with the addition of the new KSYN3A synthesizer, due to its extremely low phase noise close to the carrier. This modification was phased into factory assembled units starting with serial number 10732 and kits starting with serial number 10728. This modification kit allows you to make the simple change in the field to an existing K3 or K3S. It requires removing the KPAIO3 interface board and soldering a leaded capacitor supplied onto the board.

https://ftp.elecraft.com/K3/Manuals%20Downloads/E740287%20KPAIO3MDKT%20Instructions.pdf

YOU need the mod if the "small amount of noise" present under "lab conditions" bothers you.
I am applying it because I do everything reasonable to make my transmissions cleaner.  It is a matter of being a "good neighbor" on the public airways for me.

73,

______________________
Clay Autery, KY5G
(318) 518-1389

On 01/20/20 11:43, Russ Tobolic via Groups.Io wrote:

Now I am all confused!  I have good old trusty K3 serial #732 with the original KPA3 and upgraded with the KSYN3A.  This is the first time I have heard of this mod so do I need it? No one has told me I have a problem.   I have a handful of the 470uF caps in my junk box.

Russ, N3CO

Re: CW Noise Pedestal

Drew Vonada-Smith K3PA
 

I agree Rob and have done mine, but I thought the answer was correct for the question.

FD for sure.

Re: OT - Radio interference from Solar Panels

Geert Jan de Groot
 

Sorry for adding to an OT topic but - good receivers want clean signals.

It is surprising how different parts of the world report differently on different interference sources.
Here in the Netherlands solar panel interference is a serious, serious issue, masking signals up to 144 MHz and higher.
The regulator has limited resources to address this. Interference is so bad that when Ms Trump visited the Netherlands a few months back, some solarpanel installations were ordered to be disabled during the visit because the installation was making the local police/fire/ambulance service unusable.

A couple of datapoints of misery.
If the wires of the solar panel are correctly twisted, then interference is much less, however, installers split the cables to save on wire cost, creating a loop antenna.
And the solar panels in itself don't create the interference, however the inverter (converting solar energy to grid voltage, and optimizing solar panel load) is often the cause. These units are supposed to be installed with proper earthing and shielding but, again, installers skimp on cost and getting the regulator to enforce is a challenge.
There are also many reports of solar panels causing fires (low voltages, high amps and poor connectors), enough to cause insurance issues.
In that regard, I welcome the Swedish report on this; I thought the population density was an issue but that doesn't apply as much in Sweden.

When I read an ARRL magazine, I seldom hear something about solar panels but reports on lamp ballasts are rife. These lamps are used for growing pot so an illegal grower would have a very good case for not causing interference and not be measurable, but interference reports are rife. I do wonder where the difference comes from (The Netherlands has a fair amount of growing activity, but lamp ballasts are never mentioned here).

Meanwhile, if you want to enjoy your K3, nee K4, then moving to a remote location makes all the difference, which is something I worry about.

73, Geert Jan PE1HZG

Re: CW Noise Pedestal

Wes Stewart
 

If you buy the Elecraft mod kit I suspect you get "any old electrolytic" capacitor.  If by audio people you mean the ones who can tell the sonic differences between regular copper and HCOF copper speaker cables I wouldn't worry about what they think.

Wes  N7WS


On Monday, January 20, 2020, 11:34:33 AM MST, Clay Autery <ky5g@...> wrote:


Replying to my own post... sorry....

I don't think I will personally just throw any old 470uF 16V electrolytic capacitor in there.  I think I will dig into the schematics a bit and try to figure out for what the cap is being introduced into the circuit.
Bulk, smoothing, response?  Other?

For instance, in audio applications, folks congregate around Elna SILMIC II series electrolytics for "smoothing"purposes...
I don't pretend to know ANYTHING about this, but it is an opportunity to learn.

73,

______________________
Clay Autery, KY5G
(318) 518-1389
On 01/20/20 12:23, Clay Autery wrote:

HERE is the Introduction to the Mod Alert:

Elecraft      •      www.elecraft.com     •     831-763-4211Elecraft KPAIO3MDKT

Installation Instructions
Revision B, August 10, 2016E740287Copyright © 2016, Elecraft, Inc.All Rights Reserved

Introduction

This modification applies only to K3S transceivers equipped with the KPA3A 100 watt power amplifier, serial numbers 10732 (factory assembled), 10728 (kits) or below, and to all K3 transceivers with the KPA3 power amplifier that have been upgraded with KSYN3A synthesizers.Tests at Elecraft have shown that a very small amount of electrical noise associated with the fans on the KPA3 (or KPA3A) amplifier module can be detected in the transmitted signal under laboratory test conditions. This modification suppresses that noise. The noise had always been present, but was only discovered with the addition of the new KSYN3A synthesizer, due to its extremely low phase noise close to the carrier. This modification was phased into factory assembled units starting with serial number 10732 and kits starting with serial number 10728. This modification kit allows you to make the simple change in the field to an existing K3 or K3S. It requires removing the KPAIO3 interface board and soldering a leaded capacitor supplied onto the board.

https://ftp.elecraft.com/K3/Manuals%20Downloads/E740287%20KPAIO3MDKT%20Instructions.pdf

YOU need the mod if the "small amount of noise" present under "lab conditions" bothers you.
I am applying it because I do everything reasonable to make my transmissions cleaner.  It is a matter of being a "good neighbor" on the public airways for me.

73,

______________________
Clay Autery, KY5G
(318) 518-1389
On 01/20/20 11:43, Russ Tobolic via Groups.Io wrote:
Now I am all confused!  I have good old trusty K3 serial #732 with the original KPA3 and upgraded with the KSYN3A.  This is the first time I have heard of this mod so do I need it? No one has told me I have a problem.   I have a handful of the 470uF caps in my junk box.

Russ, N3CO

Re: Bluetooth adapter for ham use

Jim - WS6X
 


I am also interested in the Bluetooth connectivity. When I got my Kirkland hearing aids I was excited to see that the remote control had an audio input. I hooked that to the K3 headphones out. The result was horrible! I figured the individually tailored EQ for each side wasn't expecting to encounter a "flat" audio signal.
Jim - WS6X
Show quoted text

Re: CW Noise Pedestal

Clay Autery
 

The instructions.... that I have linked here multiple times only states:

470 uF, rated at 16 V...  And electrolytic is the only type that can reasonably meet those requirements in a package that will fit the place/space, et al.

BUT, there is a ton of "room" to negotiate in that rather wide set of limits...

I verified on the schematics that the cap is across the two positive leads to the two fan headers....
I do NOT have the depth of knowledge to say precisely HOW it is doing the job, but I plan to use the "best" quality capacitor I can find to put there... but "noise suppression" is the declared purpose.
There is no further description of what kind of noise... I assume that the two fans produce the noise and it is the differential between them that is injected back into the system via the power leads and onto the PA output signal.

Not ALL fans have proper filtering near the motor on the motor leads...  I do NOT know if that is the case here.  But obviously, this cap "fixes" this to a dgree found acceptable to the engineers at Elecraft.
That is good enough for me.

"Best" has a lot of definitions, depending on application, so perhaps "best quality" I can find is a better term.

73,

______________________
Clay Autery, KY5G
(318) 518-1389
On 01/20/20 12:49, Richard Smith wrote:

What are the other specs for the cap, voltage, temp, etc?   Thanks.  RAS

On Jan 20, 2020, at 12:15 PM, Rob Sherwood <rob@...> wrote:

Your neighbor or Field Day!  For the price of a 470 uF capacitor, why not do it?   Rob, NC0B
 
From: Elecraft-K3@groups.io [mailto:Elecraft-K3@groups.io] On Behalf Of Drew Vonada-Smith K3PA
Sent: Monday, January 20, 2020 11:09 AM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] CW Noise Pedestal
 
It is the kind of thing only your neighbor is likely to hear.

Re: CW Noise Pedestal

Richard Smith
 

What are the other specs for the cap, voltage, temp, etc?   Thanks.  RAS

On Jan 20, 2020, at 12:15 PM, Rob Sherwood <rob@...> wrote:

Your neighbor or Field Day!  For the price of a 470 uF capacitor, why not do it?   Rob, NC0B
 
From: Elecraft-K3@groups.io [mailto:Elecraft-K3@groups.io] On Behalf Of Drew Vonada-Smith K3PA
Sent: Monday, January 20, 2020 11:09 AM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] CW Noise Pedestal
 
It is the kind of thing only your neighbor is likely to hear.


Re: K-Pod for Sale

Irwin Darack
 

K-Pod is sold.

Irwin KD3TB 

On Sun, Jan 19, 2020 at 1:31 PM Irwin Darack <idarack@...> wrote:
I am selling my  K-Pod. Original owner - Non Smoker

  • K-Pod - Firmware vs 1.09 installed
  • DC Power Cable, 2.1 mm Barrel Connector to RCA Connector
  • K3S/K3 Data Cable, 6P6C Connectors, 30” (76 cm), E980326 Cable,
  • USB A to B Connector, 36” (91 cm), E850629
Photo Attached

$235 with Shipping Con USA.

IDarack(at)gmail.com

Irwin KD3TB
--
Irwin KD3TB

Re: CW Noise Pedestal

Clay Autery
 

Replying to my own post... sorry....

I don't think I will personally just throw any old 470uF 16V electrolytic capacitor in there.  I think I will dig into the schematics a bit and try to figure out for what the cap is being introduced into the circuit.
Bulk, smoothing, response?  Other?

For instance, in audio applications, folks congregate around Elna SILMIC II series electrolytics for "smoothing"purposes...
I don't pretend to know ANYTHING about this, but it is an opportunity to learn.

73,

______________________
Clay Autery, KY5G
(318) 518-1389
On 01/20/20 12:23, Clay Autery wrote:

HERE is the Introduction to the Mod Alert:

Elecraft      •      www.elecraft.com     •     831-763-4211Elecraft KPAIO3MDKT

Installation Instructions
Revision B, August 10, 2016E740287Copyright © 2016, Elecraft, Inc.All Rights Reserved

Introduction

This modification applies only to K3S transceivers equipped with the KPA3A 100 watt power amplifier, serial numbers 10732 (factory assembled), 10728 (kits) or below, and to all K3 transceivers with the KPA3 power amplifier that have been upgraded with KSYN3A synthesizers.Tests at Elecraft have shown that a very small amount of electrical noise associated with the fans on the KPA3 (or KPA3A) amplifier module can be detected in the transmitted signal under laboratory test conditions. This modification suppresses that noise. The noise had always been present, but was only discovered with the addition of the new KSYN3A synthesizer, due to its extremely low phase noise close to the carrier. This modification was phased into factory assembled units starting with serial number 10732 and kits starting with serial number 10728. This modification kit allows you to make the simple change in the field to an existing K3 or K3S. It requires removing the KPAIO3 interface board and soldering a leaded capacitor supplied onto the board.

https://ftp.elecraft.com/K3/Manuals%20Downloads/E740287%20KPAIO3MDKT%20Instructions.pdf

YOU need the mod if the "small amount of noise" present under "lab conditions" bothers you.
I am applying it because I do everything reasonable to make my transmissions cleaner.  It is a matter of being a "good neighbor" on the public airways for me.

73,

______________________
Clay Autery, KY5G
(318) 518-1389
On 01/20/20 11:43, Russ Tobolic via Groups.Io wrote:
Now I am all confused!  I have good old trusty K3 serial #732 with the original KPA3 and upgraded with the KSYN3A.  This is the first time I have heard of this mod so do I need it? No one has told me I have a problem.   I have a handful of the 470uF caps in my junk box.

Russ, N3CO

Re: CW Noise Pedestal

Clay Autery
 

HERE is the Introduction to the Mod Alert:

Elecraft      •      www.elecraft.com     •     831-763-4211Elecraft KPAIO3MDKT

Installation Instructions
Revision B, August 10, 2016E740287Copyright © 2016, Elecraft, Inc.All Rights Reserved

Introduction

This modification applies only to K3S transceivers equipped with the KPA3A 100 watt power amplifier, serial numbers 10732 (factory assembled), 10728 (kits) or below, and to all K3 transceivers with the KPA3 power amplifier that have been upgraded with KSYN3A synthesizers.Tests at Elecraft have shown that a very small amount of electrical noise associated with the fans on the KPA3 (or KPA3A) amplifier module can be detected in the transmitted signal under laboratory test conditions. This modification suppresses that noise. The noise had always been present, but was only discovered with the addition of the new KSYN3A synthesizer, due to its extremely low phase noise close to the carrier. This modification was phased into factory assembled units starting with serial number 10732 and kits starting with serial number 10728. This modification kit allows you to make the simple change in the field to an existing K3 or K3S. It requires removing the KPAIO3 interface board and soldering a leaded capacitor supplied onto the board.

https://ftp.elecraft.com/K3/Manuals%20Downloads/E740287%20KPAIO3MDKT%20Instructions.pdf

YOU need the mod if the "small amount of noise" present under "lab conditions" bothers you.
I am applying it because I do everything reasonable to make my transmissions cleaner.  It is a matter of being a "good neighbor" on the public airways for me.

73,

______________________
Clay Autery, KY5G
(318) 518-1389
On 01/20/20 11:43, Russ Tobolic via Groups.Io wrote:

Now I am all confused!  I have good old trusty K3 serial #732 with the original KPA3 and upgraded with the KSYN3A.  This is the first time I have heard of this mod so do I need it? No one has told me I have a problem.   I have a handful of the 470uF caps in my junk box.

Russ, N3CO

Re: CW Noise Pedestal

Rob Sherwood
 

Your neighbor or Field Day!  For the price of a 470 uF capacitor, why not do it?   Rob, NC0B

 

From: Elecraft-K3@groups.io [mailto:Elecraft-K3@groups.io] On Behalf Of Drew Vonada-Smith K3PA
Sent: Monday, January 20, 2020 11:09 AM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] CW Noise Pedestal

 

It is the kind of thing only your neighbor is likely to hear.

Re: Bluetooth adapter for ham use

KB1YJ. (Bill)
 

Interest in results

Bill Clapp kb1yj @arrl

On Jan 19, 2020, at 06:33, Charlie T, k3ICH <pincon@...> wrote:



 

 

OK, I just got me a brandee new set of Costco hearing aids that pair automatically with my  iPhone via built-in Bluetooth.

So, I’m thinking, maybe I should buy a Bluetooth transmitter and plug it into my K3’s headphone jack.

My question is, what should I buy?  They seem to range from under 10 bucks to hundreds, so as usual, I’m confused.

 

I really only need the transmitter side of Bluetooth so I can hear the radio’s Rx audio in my hearing bones.

I don’t need the  BT Rx function as I will use my station mike for transmitting.

 

PLEASE do not reply through the forum as I don’t want to start another endless thread which has to be cut-off by the moderators.

Send replies to k3ich at arrl dot net.

 

If enough people also want to know the recommendations, I will post the results.

 

I have also ordered Costco’s version of the “TV adapter” which has a TOS link (optical) input.

It’s a whopping hundred bucks, so if I can find an equivalent low latency (good lip-sync) unit for a lot less I’ll return it,

since they give you six months to evaluate the system and offer a full refund during that time frame.

 

As a side comment, these are Kirkland’s version 9  hearing aids which are a VAST improvement over my previous version 7 bones.

I’m not connected in any way with Costco, plus,  their audiologists do NOT receive any commission on sales.

Simply put, you cannot beat their prices and service on hearing aids. I’ve tried!

 

73, Charlie k3ICH

 

Re: CW Noise Pedestal

Drew Vonada-Smith K3PA
 

It is the kind of thing only your neighbor is likely to hear.

Re: CW Noise Pedestal

Michael Harris <mike.harris@...>
 

Russ,

From the KPAIO3 mod kit manual, presumably available for download from the Elecraft web site:

<snip>
Tests at Elecraft have shown that a very small amount of electrical noise associated with the fans on the KPA3 (or KPA3A) amplifier module can be detected in the transmitted signal under laboratory test conditions. This modification suppresses that noise. The noise had always been present, but was only discovered with the addition
of the new KSYN3A synthesizer, due to its extremely low phase noise close to the carrier.
<unsnip>

Draw your own conclusions as to the need to do the mod.

Regards,

Mike VP8NO

On 20/01/2020 14:43, Russ Tobolic via Groups.Io wrote:
Now I am all confused!  I have good old trusty K3 serial #732 with the original KPA3 and upgraded with the KSYN3A.  This is the first time I have heard of this mod so do I need it? No one has told me I have a problem.   I have a handful of the 470uF caps in my junk box.
Russ, N3CO

Re: CW Noise Pedestal

Russ Tobolic
 

Now I am all confused!  I have good old trusty K3 serial #732 with the original KPA3 and upgraded with the KSYN3A.  This is the first time I have heard of this mod so do I need it? No one has told me I have a problem.   I have a handful of the 470uF caps in my junk box.

Russ, N3CO

Re: Bluetooth adapter for ham use

David Box
 

You might take a look at this transmiter, works well for me operating CW.

https://www.amazon.com/gp/product/B077MXFJGQ/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1

de Dave K5MWR

On 1/20/2020 07:48, Ned Mountain WC4X wrote:
Charlie, 
I am interested in what you find out and suspect many others are as well.  Please keep us posted.
Ned
WC4X