Elecraft

500Hz Filter Offset Question

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Rich-4

500Hz Filter Offset Question

I just received my 500hz filters from Elecraft. I guess I assumed they
were 8 pole, however they are 5 pole. The web page does not specify 5
or 8 pole, or I did not navigate the webpage properly.

So now that I have 5 pole filters, I seem to recall that entering the
offset freq is not required any longer on the K3S, is that true?

Also does a K3 upgraded with K3S features need the offset freq?

I should mention that they are all matched.

Is there a graphic representation of these 5 pole filters available?

Thanks

Rich

K3RWN

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Nr4c

Re: 500Hz Filter Offset Question

Well they used to be difrentisted from the 8 pole filters haven’t looked for them on new site.

Eight pole filters have a metal can enclosing them. The five pole filters are just exposed PC boards.

I think I have offsets set on my K3S for the 200 Hz filters.

Sent from my iPhone
...nr4c. bill

> On Jan 14, 2019, at 5:30 PM, Rich <[hidden email]> wrote:
>
> I just received my 500hz filters from Elecraft. I guess I assumed they were 8 pole, however they are 5 pole. The web page does not specify 5 or 8 pole, or I did not navigate the webpage properly.
>
> So now that I have 5 pole filters, I seem to recall that entering the offset freq is not required any longer on the K3S, is that true?
>
> Also does a K3 upgraded with K3S features need the offset freq?
>
> I should mention that they are all matched.
>
> Is there a graphic representation of these 5 pole filters available?
>
> Thanks
>
> Rich
>
> K3RWN
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
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> Please help support this email list: http://www.qsl.net/donate.html
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K9MA

Re: 500Hz Filter Offset Question

It looks to me like you still have to set the offsets. See manual. It
doesn't appear there is any difference between the K3 and K3s as far as
filter offsets.

When I set up my K3, I tried to get the 200 Hz filter offset "just
right", so the noise would sound exactly the same in USB or LSB (CW or
CW REV). I found that the filter drifted around quite a bit with
temperature. So, if you have the narrow filters, let the temperature
stabilize before setting the offset. Wider filters are much less critical.

73,
Scott K9MA

On 1/14/2019 17:13, Nr4c wrote:

> Well they used to be difrentisted from the 8 pole filters haven’t looked for them on new site.
>
> Eight pole filters have a metal can enclosing them. The five pole filters are just exposed PC boards.
>
> I think I have offsets set on my K3S for the 200 Hz filters.
>
> Sent from my iPhone
> ...nr4c. bill
>
>
>> On Jan 14, 2019, at 5:30 PM, Rich <[hidden email]> wrote:
>>
>> I just received my 500hz filters from Elecraft. I guess I assumed they were 8 pole, however they are 5 pole. The web page does not specify 5 or 8 pole, or I did not navigate the webpage properly.
>>
>> So now that I have 5 pole filters, I seem to recall that entering the offset freq is not required any longer on the K3S, is that true?
>>
>> Also does a K3 upgraded with K3S features need the offset freq?
>>
>> I should mention that they are all matched.
>>
>> Is there a graphic representation of these 5 pole filters available?
>>
>> Thanks
>>
>> Rich
>>
>> K3RWN
>>
>

--
Scott K9MA

[hidden email]

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Elecraft mailing list

Re: 500Hz Filter Offset Question

In reply to this post by Rich-4

This has to do with the synthesizer boards. I believe the answer is that you don’t need to match them with the new synthesizers. You may need to still enter the offsets, however.

73!
Jack, W6FB

> On Jan 14, 2019, at 2:30 PM, Rich <[hidden email]> wrote:
>
> I just received my 500hz filters from Elecraft. I guess I assumed they were 8 pole, however they are 5 pole. The web page does not specify 5 or 8 pole, or I did not navigate the webpage properly.
>
> So now that I have 5 pole filters, I seem to recall that entering the offset freq is not required any longer on the K3S, is that true?
>
> Also does a K3 upgraded with K3S features need the offset freq?
>
> I should mention that they are all matched.
>
> Is there a graphic representation of these 5 pole filters available?
>
> Thanks
>
> Rich
>
> K3RWN
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

Don Wilhelm

Re: 500Hz Filter Offset Question

In reply to this post by Rich-4

Rich,

Wrong - you must enter the offset frequency.
Related - what is true is that you do not need matched filters in the
main and the subRX for Diversity reception with the new synthesizers.

There are plots on the Elecraft website showing the filter response. I
don't recall if the 500 Hz filters are included.

73,
Don W3FPR

On 1/14/2019 5:30 PM, Rich wrote:
>
> So now that I have 5 pole filters, I seem to recall that entering the
> offset freq is not required any longer on the K3S, is that true?
>
> Also does a K3 upgraded with K3S features need the offset freq?
>
> I should mention that they are all matched.
>
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Rich-4

Re: 500Hz Filter Offset Question

Thanks all. I did read the manual, but it would help if I had read the
entire paragraph and not just one sentence.

In this case they sent me all matching offsets, so they are all the same.

I was surprised that they do not have 500hz 8 pole.

Oh well, back to putting the radio back together

Ric

On 1/14/2019 18:42 PM, Don Wilhelm wrote:

> Rich,
>
> Wrong - you must enter the offset frequency.
> Related - what is true is that you do not need matched filters in the
> main and the subRX for Diversity reception with the new synthesizers.
>
> There are plots on the Elecraft website showing the filter response.
> I don't recall if the 500 Hz filters are included.
>
> 73,
> Don W3FPR
>
> On 1/14/2019 5:30 PM, Rich wrote:
>>
>> So now that I have 5 pole filters, I seem to recall that entering the
>> offset freq is not required any longer on the K3S, is that true?
>>
>> Also does a K3 upgraded with K3S features need the offset freq?
>>
>> I should mention that they are all matched.
>>
>

Mark Musick

Re: 500Hz Filter Offset Question

INRAD has 500Hz 8 pole filters for the K3/K3S.
I have one in the main receiver and one in the sub-receiver.

Mark, WB9CIF

-----Original Message-----
From: [hidden email] <[hidden email]> On Behalf Of Rich
Sent: Monday, January 14, 2019 23:56
To: [hidden email]; Elecraft <[hidden email]>
Subject: Re: [Elecraft] 500Hz Filter Offset Question

Thanks all. I did read the manual, but it would help if I had read the entire paragraph and not just one sentence.

In this case they sent me all matching offsets, so they are all the same.

I was surprised that they do not have 500hz 8 pole.

Oh well, back to putting the radio back together

Ric

On 1/14/2019 18:42 PM, Don Wilhelm wrote:

> Rich,
>
> Wrong - you must enter the offset frequency.
> Related - what is true is that you do not need matched filters in the
> main and the subRX for Diversity reception with the new synthesizers.
>
> There are plots on the Elecraft website showing the filter response. I
> don't recall if the 500 Hz filters are included.
>
> 73,
> Don W3FPR
>
> On 1/14/2019 5:30 PM, Rich wrote:
>>
>> So now that I have 5 pole filters, I seem to recall that entering the
>> offset freq is not required any longer on the K3S, is that true?
>>
>> Also does a K3 upgraded with K3S features need the offset freq?
>>
>> I should mention that they are all matched.
>>
>

donovanf

Re: 500Hz Filter Offset Question

oops. The Elecraft 500 Hz 8 pole filter is discontinued...

http://www.inrad.net/product.php?productid=316&cat=140

73
Frank
W3LPL

----- Original Message -----

From: "Mark Musick" <[hidden email]>
To: "Rich" <[hidden email]>, [hidden email], "Elecraft" <[hidden email]>
Sent: Tuesday, January 15, 2019 12:17:05 AM
Subject: Re: [Elecraft] 500Hz Filter Offset Question

INRAD has 500Hz 8 pole filters for the K3/K3S.
I have one in the main receiver and one in the sub-receiver.

Mark, WB9CIF

-----Original Message-----
From: [hidden email] <[hidden email]> On Behalf Of Rich
Sent: Monday, January 14, 2019 23:56
To: [hidden email]; Elecraft <[hidden email]>
Subject: Re: [Elecraft] 500Hz Filter Offset Question

Thanks all. I did read the manual, but it would help if I had read the entire paragraph and not just one sentence.

In this case they sent me all matching offsets, so they are all the same.

I was surprised that they do not have 500hz 8 pole.

Oh well, back to putting the radio back together

Ric

On 1/14/2019 18:42 PM, Don Wilhelm wrote:

> Rich,
>
> Wrong - you must enter the offset frequency.
> Related - what is true is that you do not need matched filters in the
> main and the subRX for Diversity reception with the new synthesizers.
>
> There are plots on the Elecraft website showing the filter response. I
> don't recall if the 500 Hz filters are included.
>
> 73,
> Don W3FPR
>
> On 1/14/2019 5:30 PM, Rich wrote:
>>
>> So now that I have 5 pole filters, I seem to recall that entering the
>> offset freq is not required any longer on the K3S, is that true?
>>
>> Also does a K3 upgraded with K3S features need the offset freq?
>>
>> I should mention that they are all matched.
>>
>

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

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email]
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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

Re: 500Hz Filter Offset Question

"Out of Stock"
Scott will order a batch if there is enough interest, usually 10 minimum.
73,Ed W0YK
-------- Original message --------From: [hidden email] Date: 1/14/19 21:24 (GMT-08:00) To: Elecraft <[hidden email]> Subject: Re: [Elecraft] 500Hz Filter Offset Question
oops. The Elecraft 500 Hz 8 pole filter is discontinued...

http://www.inrad.net/product.php?productid=316&cat=140

73
Frank
W3LPL

----- Original Message -----

From: "Mark Musick" <[hidden email]>
To: "Rich" <[hidden email]>, [hidden email], "Elecraft" <[hidden email]>
Sent: Tuesday, January 15, 2019 12:17:05 AM
Subject: Re: [Elecraft] 500Hz Filter Offset Question

INRAD has 500Hz 8 pole filters for the K3/K3S.
I have one in the main receiver and one in the sub-receiver.

Mark, WB9CIF

-----Original Message-----
From: [hidden email] <[hidden email]> On Behalf Of Rich
Sent: Monday, January 14, 2019 23:56
To: [hidden email]; Elecraft <[hidden email]>
Subject: Re: [Elecraft] 500Hz Filter Offset Question

Thanks all. I did read the manual, but it would help if I had read the entire paragraph and not just one sentence.

In this case they sent me all matching offsets, so they are all the same.

I was surprised that they do not have 500hz 8 pole.

Oh well, back to putting the radio back together

Ric

On 1/14/2019 18:42 PM, Don Wilhelm wrote:

> Rich,
>
> Wrong - you must enter the offset frequency.
> Related - what is true is that you do not need matched filters in the
> main and the subRX for Diversity reception with the new synthesizers.
>
> There are plots on the Elecraft website showing the filter response. I
> don't recall if the 500 Hz filters are included.
>
> 73,
> Don W3FPR
>
> On 1/14/2019 5:30 PM, Rich wrote:
>>
>> So now that I have 5 pole filters, I seem to recall that entering the
>> offset freq is not required any longer on the K3S, is that true?
>>
>> Also does a K3 upgraded with K3S features need the offset freq?
>>
>> I should mention that they are all matched.
>>
>