75 ohm cable on Buffered I.F. Output?

[Bert Rollen]

All,

 

I am setting up a LP-PAN with my K3.

 

Will I cause much problem by using a 75 ohm jumper on the IF ?  (I happen to
have several fairly nice 24" Belden 8263 BNC jumpers on hand).  

 

 

Thanks,

 

Bert

 

 

 
<https://www.linkedin.com/profile/view?id=116628572&authType=name&authToken=
cHsm&locale=en_US&pvs=pp&trk=ppro_viewmore> Bert Rollen, PMP

 <mailto:[hidden email]> [hidden email]

865-599-6074

 

 

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[Don Wilhelm-4]

For that short distance, it will not matter if you use 50 ohm of 75 ohm
coax.

73,
Don W3FPR

On 1/15/2016 8:15 PM, Bert Rollen wrote:
> I am setting up a LP-PAN with my K3.
>
> Will I cause much problem by using a 75 ohm jumper on the IF ?  (I happen to
> have several fairly nice 24" Belden 8263 BNC jumpers on hand).
>

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[k6dgw]

No.  What will matter is the quality of the connectors.  The 1st IF
output from the K3 is low level, the P3 is basically a fairly sensitive
HF receiver, and bad connectors can create all sorts of problems.

You didn't give a S/N range for your K3, but there is a simple mod
[destroy one surface mount resistor and replace it with a non-SMC
resistor] that will raise the IF output.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the Cal QSO Party 1-2 Oct 2016
- www.cqp.org

On 1/15/2016 5:15 PM, Bert Rollen wrote:

> I am setting up a LP-PAN with my K3.

> Will I cause much problem by using a 75 ohm jumper on the IF ?  (I happen to
> have several fairly nice 24" Belden 8263 BNC jumpers on hand).

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[Bert Rollen]

Thanks all for the replies.

With renewed inspiration, I have dug several options out of my junk-box,
including some 6" & some 24" heliax jumpers. They are N-type, but I can
adapt.

I also found a 8" LMR-400 jumper with BNCs on it, and a few other jumpers.

(I have waaaay to much crap around here)


73, Bert  

BTW, the K3 is a 1500+ serial no. , but has been fully updated at the
factory a few months back.  Only thing I am missing is the KIO3B and the
4-layer main-board (and have no intent to upgrade those).


-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of Fred
Jensen
Sent: Friday, January 15, 2016 8:35 PM
To: [hidden email]
Subject: Re: [Elecraft] 75 ohm cable on Buffered I.F. Output?

No.  What will matter is the quality of the connectors.  The 1st IF output
from the K3 is low level, the P3 is basically a fairly sensitive HF
receiver, and bad connectors can create all sorts of problems.

You didn't give a S/N range for your K3, but there is a simple mod [destroy
one surface mount resistor and replace it with a non-SMC resistor] that will
raise the IF output.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the Cal QSO Party 1-2 Oct 2016
- www.cqp.org

On 1/15/2016 5:15 PM, Bert Rollen wrote:

> I am setting up a LP-PAN with my K3.

> Will I cause much problem by using a 75 ohm jumper on the IF ?  (I
> happen to have several fairly nice 24" Belden 8263 BNC jumpers on hand).

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[Alan Bloom]

On 01/16/2016 09:51 AM, Bert Rollen wrote:
...
> With renewed inspiration, I have dug several options out of my junk-box,
> including some 6" & some 24" heliax jumpers. They are N-type, but I can
> adapt.

Male N connectors fit perfectly into female BNCs.  (Try it!)  The only
downside is there is no positive retention, so you don't want to use
this method if there is a chance the cable will get tugged on.

Alan N1AL

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[N8LP]

No, as long as the cable is well shielded and the connectors fit well.

Larry N8LP



On 1/16/2016 4:06 PM, [hidden email] wrote:

> Date: Fri, 15 Jan 2016 20:15:32 -0500
> From: Bert Rollen<[hidden email]>
> To:<[hidden email]>
> Subject: [Elecraft] 75 ohm cable on Buffered I.F. Output?
> Message-ID:<[hidden email]>
> Content-Type: text/plain; charset="us-ascii"
>
> All,
>
>  
>
> I am setting up a LP-PAN with my K3.
>
>  
>
> Will I cause much problem by using a 75 ohm jumper on the IF ?  (I happen to
> have several fairly nice 24" Belden 8263 BNC jumpers on hand).
>
>  
>
>  
>
> Thanks,
>
>  
>
> Bert
>
>  

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[Doug Turnbull]

Dear OMs and Yls,
      Elecraft is a sponsor so perhaps this off topic account of Palmyra
Island is of interest.   EI6IL did some research on Palmyra and came up with
this link which gives an interesting account of dark happenings on Palmyra
Atoll.    A read of this may add some spice to your hunt.   Good luck.

http://mysteriousuniverse.org/2014/07/the-cursed-paradise-of-palmyra-atoll/

                73 Doug EI2CN



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[Fred Townsend-2]

Two videos cover the subject:
https://www.youtube.com/watch?v=CkSHtqxKj8o
https://www.youtube.com/watch?v=GqaYWdZ9BlM

73
Fred, AE6QL
-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of Doug
Turnbull
Sent: Saturday, January 16, 2016 1:31 PM
To: [hidden email]
Subject: [Elecraft] [OT} K5P Palmyra Mystery Island


Dear OMs and Yls,
      Elecraft is a sponsor so perhaps this off topic account of Palmyra
Island is of interest.   EI6IL did some research on Palmyra and came up with
this link which gives an interesting account of dark happenings on Palmyra
Atoll.    A read of this may add some spice to your hunt.   Good luck.

http://mysteriousuniverse.org/2014/07/the-cursed-paradise-of-palmyra-atoll/

                73 Doug EI2CN



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[Vic Rosenthal]

Possibly this explains the deliberate QRM, which so far is all I can hear on their frequency.

Vic 4X6GP/K2VCO

> On 16 Jan 2016, at 11:30 PM, Doug Turnbull <[hidden email]> wrote:
>
>
> Dear OMs and Yls,
>      Elecraft is a sponsor so perhaps this off topic account of Palmyra
> Island is of interest.   EI6IL did some research on Palmyra and came up with
> this link which gives an interesting account of dark happenings on Palmyra
> Atoll.    A read of this may add some spice to your hunt.   Good luck.
>
> http://mysteriousuniverse.org/2014/07/the-cursed-paradise-of-palmyra-atoll/
>
>                73 Doug EI2CN
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
> 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]

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