Re: [Elecraft] How do I know if my K2 has BFOMDKT installed?

2022-07-22 Thread Dave Van Wallaghen

Correct Andrew. Even if it is a 10K RP you'll still want to add R19.

I just got done fully upgrading a field test K2 here and had 100K stuck 
in my head. But it is the same whether 100K or 10K RP's.


73,
Dave, W8FGU


On 7/22/2022 10:52:06 AM, "Andrew Moore"  wrote:


Hi Dave -

My s/n 892 currently has RP2 = 10k, not 100k. Does the 2.7k still need 
to be added across pins 7 and 8?


From the PLL Ref Upgrade kit docs (E850138), it sounds like it might 
need to be added regardless of 10k/100k, as the first step below 
doesn't differentiate, while the next step does:


[_] If your K2 serial number is lower than 3000, make sure you have 
installed the BFO modification (BFOMDKT). One of the items supplied in 
this kit is a 2.7-k resistor. This resistor, designated R19, must be 
soldered across pins 7 and 8 of resistor network WP2 (in the PLL area).


[_] If you have an older K2 (early revision A for Field Test), you may 
have a 100k resistor network installed at RP2, which is in the VCO 
area. If so, you'll need to solder two 10k to 12k resistors across RP2, 
which can be difficult...


Thanks,
-Andrew NV1B
..


On Fri, Jul 22, 2022 at 9:30 AM Dave Van Wallaghen  
wrote:

Hi Andrew,

Yes, place that 2.7KΩ resistor across RP2 pins 7 & 8. This resistor is
on the output of U6A to drive the varactor diodes in the PLL 
Osciillator
circuit. It was changed to 2.7K in Rev B. In Rev A it was 100K and 
part

of RP2, so you are just placing a 2.7k resistor in parallel with the
100K on RP2 P& and P8. I believe the change was to help add stability 
to

the PLL Oscillator circuit.

73,
Dave, W8FGU


On 7/21/2022 11:04:58 PM, "Andrew Moore"  
wrote:


>I just installed the temperature compensated PLL reference upgrade 
kit on

>my K2 #892.
>
>From everything I can see, this rig (which I bought used) has been 
brought

>up to date in almost every way.
>
>One step in the assembly instructions says that for S/N < 3000, make 
sure

>I've installed the BFOMDKT upgrade, and that the kit includes a 2.7k
>resistor R19 that's soldered across pins 7 and 8 of RP2 (according to
>document "Upgrading the Elecraft K2 to Revision B").
>
>My RP2 (10K) has no resistor across any pins. However, I do have L33
>upgraded to the prewound 41 uH inductor, which I think was part of 
the

>BFOMDKT.
>
>Should I be adding 2.7k across pins 7 and 8? Is there any reason this 
would

>not have been done as part of the BFOMDKIT upgrade?
>
>Thanks,
>-Andrew NV1B
>..
>__
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
>Help: http://mailman.qth.net/mmfaq.htm
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>
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Re: [Elecraft] How do I know if my K2 has BFOMDKT installed?

2022-07-22 Thread Andrew Moore
Hi Dave -

My s/n 892 currently has RP2 = 10k, not 100k. Does the 2.7k still need to
be added across pins 7 and 8?

From the PLL Ref Upgrade kit docs (E850138), it sounds like it might need
to be added regardless of 10k/100k, as the first step below doesn't
differentiate, while the next step does:

[_] If your K2 serial number is lower than 3000, make sure you have
installed the BFO modification (BFOMDKT). One of the items supplied in this
kit is a 2.7-k resistor. This resistor, designated R19, must be soldered
across pins 7 and 8 of resistor network WP2 (in the PLL area).

[_] If you have an older K2 (early revision A for Field Test), you may have
a 100k resistor network installed at RP2, which is in the VCO area. If so,
you'll need to solder two 10k to 12k resistors across RP2, which can be
difficult...

Thanks,
-Andrew NV1B
..


On Fri, Jul 22, 2022 at 9:30 AM Dave Van Wallaghen  wrote:

> Hi Andrew,
>
> Yes, place that 2.7KΩ resistor across RP2 pins 7 & 8. This resistor is
> on the output of U6A to drive the varactor diodes in the PLL Osciillator
> circuit. It was changed to 2.7K in Rev B. In Rev A it was 100K and part
> of RP2, so you are just placing a 2.7k resistor in parallel with the
> 100K on RP2 P& and P8. I believe the change was to help add stability to
> the PLL Oscillator circuit.
>
> 73,
> Dave, W8FGU
>
>
> On 7/21/2022 11:04:58 PM, "Andrew Moore"  wrote:
>
> >I just installed the temperature compensated PLL reference upgrade kit on
> >my K2 #892.
> >
> >From everything I can see, this rig (which I bought used) has been brought
> >up to date in almost every way.
> >
> >One step in the assembly instructions says that for S/N < 3000, make sure
> >I've installed the BFOMDKT upgrade, and that the kit includes a 2.7k
> >resistor R19 that's soldered across pins 7 and 8 of RP2 (according to
> >document "Upgrading the Elecraft K2 to Revision B").
> >
> >My RP2 (10K) has no resistor across any pins. However, I do have L33
> >upgraded to the prewound 41 uH inductor, which I think was part of the
> >BFOMDKT.
> >
> >Should I be adding 2.7k across pins 7 and 8? Is there any reason this
> would
> >not have been done as part of the BFOMDKIT upgrade?
> >
> >Thanks,
> >-Andrew NV1B
> >..
> >__
> >Elecraft mailing list
> >Home: http://mailman.qth.net/mailman/listinfo/elecraft
> >Help: http://mailman.qth.net/mmfaq.htm
> >Post: mailto:Elecraft@mailman.qth.net
> >
> >This list hosted by: http://www.qsl.net
> >Please help support this email list: http://www.qsl.net/donate.html
> >Message delivered to d...@w8fgu.com
>
>
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Re: [Elecraft] How do I know if my K2 has BFOMDKT installed?

2022-07-22 Thread Dave Van Wallaghen

Hi Andrew,

Yes, place that 2.7KΩ resistor across RP2 pins 7 & 8. This resistor is 
on the output of U6A to drive the varactor diodes in the PLL Osciillator 
circuit. It was changed to 2.7K in Rev B. In Rev A it was 100K and part 
of RP2, so you are just placing a 2.7k resistor in parallel with the 
100K on RP2 P& and P8. I believe the change was to help add stability to 
the PLL Oscillator circuit.


73,
Dave, W8FGU


On 7/21/2022 11:04:58 PM, "Andrew Moore"  wrote:


I just installed the temperature compensated PLL reference upgrade kit on
my K2 #892.

From everything I can see, this rig (which I bought used) has been brought
up to date in almost every way.

One step in the assembly instructions says that for S/N < 3000, make sure
I've installed the BFOMDKT upgrade, and that the kit includes a 2.7k
resistor R19 that's soldered across pins 7 and 8 of RP2 (according to
document "Upgrading the Elecraft K2 to Revision B").

My RP2 (10K) has no resistor across any pins. However, I do have L33
upgraded to the prewound 41 uH inductor, which I think was part of the
BFOMDKT.

Should I be adding 2.7k across pins 7 and 8? Is there any reason this would
not have been done as part of the BFOMDKIT upgrade?

Thanks,
-Andrew NV1B
..
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