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14361!

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S55M

14361!

While surfing arround on Elecraft list archives i read abt 14361 birdie.
The common statment is "Thanks God is out of band"
Not if You are using 144/14MHz transverter :(

Adi
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Geoffrey Mackenzie-Kennedy-2

Re: 14361!

Hello Adi,

14MHz is also the IF for my VHF transverters, but I use another receiver and
Tx exciter with them.

When I can I want to shield parts of the K2, but I do not hope for miracles
because of the PCB *wires* that would go in and out of shielded areas. To do
a proper 100% job would be difficult, so I say to myself STOP, ENOUGH !!

73, Geoff GM4ESD.

******************************************************

Adi S55M wrote:

While surfing arround on Elecraft list archives i read abt 14361 birdie.
The common statment is "Thanks God is out of band"
Not if You are using 144/14MHz transverter :(

Adi

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S55M

Re: 14361!

Jap Geoff!

I played a bit with my K2 to see if screening of some parts could be done.
The signal path on the bottom of main (RF) PCB is on short paths so putting
the coax lines would not do the job i think (maybe only one trace to TUF
mixer wich is abt 6cm lomg).
The area under control board vher OSC seats and DSP is not easily accessible
so i must spend some more time to see if anything can be done.
I am just having fun HI HI.

73's
Adi
----- Original Message -----
From: "Geoffrey Mackenzie-Kennedy" <[hidden email]>
To: "S55M" <[hidden email]>
Cc: "Elecraft Discussion List" <[hidden email]>
Sent: Tuesday, March 22, 2005 12:21 PM
Subject: Re: [Elecraft] 14361!

> Hello Adi,
>
> 14MHz is also the IF for my VHF transverters, but I use another receiver
and
> Tx exciter with them.
>
> When I can I want to shield parts of the K2, but I do not hope for
miracles
> because of the PCB *wires* that would go in and out of shielded areas. To
do

> a proper 100% job would be difficult, so I say to myself STOP, ENOUGH !!
>
> 73, Geoff GM4ESD.
>
> ******************************************************
>
> Adi S55M wrote:
>
> While surfing arround on Elecraft list archives i read abt 14361 birdie.
> The common statment is "Thanks God is out of band"
> Not if You are using 144/14MHz transverter :(
>
> Adi
>
>

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Bill Coleman-2

Re: 14361!

In reply to this post by S55M

On Mar 21, 2005, at 6:03 PM, S55M wrote:
>
> While surfing arround on Elecraft list archives i read abt 14361
> birdie.
> The common statment is "Thanks God is out of band"
> Not if You are using 144/14MHz transverter :(

Why use 14 MHz as an IF? Seems like 28 MHz is a better choice -- and
you get 2 MHz of coverage instead of nominally 350-500 kHz.

Bill Coleman, AA4LR, PP-ASEL Mail: [hidden email]
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901

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S55M

Re: 14361!

Hello!

If You look at the characteristics of HF common radios You will see the huge
difference between the preformance on 28MHz and 14MHz for most commercial
equipment and -hence-there is no technical reason for that!.
TS870 and 756pro are pure examples :)

Table 4: IP3 values of different HF RIG's on 14 MHz and 28 MHz in AIP ON
state (preamplifier off) as taken from G3SJX data (50 kHz tone spacing).

HF RIG
IP3 [dBm] @ 14 MHz
IP3 [dBm] @ 28 MHz

FT-1000MP
24
6

FT-1000MP MARK-V
24
2

TS-870
17
20

TS-850
25
16

IC-775DSP
12
1

IC-756PRO
13
14

IC-738/736
21
22

That is the reason!

S55M-Adi

----- Original Message -----
From: "Bill Coleman" <[hidden email]>
To: "S55M" <[hidden email]>
Cc: "Elecraft" <[hidden email]>
Sent: Tuesday, March 22, 2005 9:44 PM
Subject: Re: [Elecraft] 14361!

>
> On Mar 21, 2005, at 6:03 PM, S55M wrote:
> >
> > While surfing arround on Elecraft list archives i read abt 14361
> > birdie.
> > The common statment is "Thanks God is out of band"
> > Not if You are using 144/14MHz transverter :(
>
> Why use 14 MHz as an IF? Seems like 28 MHz is a better choice -- and
> you get 2 MHz of coverage instead of nominally 350-500 kHz.
>
> Bill Coleman, AA4LR, PP-ASEL Mail: [hidden email]
> Quote: "Not within a thousand years will man ever fly!"
> -- Wilbur Wright, 1901
>

Bill Coleman-2

Re: 14361!

On Mar 22, 2005, at 4:22 PM, S55M wrote:

> If You look at the characteristics of HF common radios You will see
> the huge
> difference between the preformance on 28MHz and 14MHz for most
> commercial
> equipment and -hence-there is no technical reason for that!.

Isn't the dynamic range of the system really limited by the dynamic
range of the transverter itself, rather than by the transceiver it is
connected to?

Seems like, with the extra RF amplification and mixer stages in a
transverter, there's more room for dynamic intermingling of signals
that would cause an overload -- especially when you consider the
transverter is typically several hundred kHz wide.

Bill Coleman, AA4LR, PP-ASEL Mail: [hidden email]
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901

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S55M

Re: 14361!

In reply to this post by S55M

> OK Bill!
>
> You and others can read everything in this UFB article written and
designed

> by good friend of mine Robert-S53WW.
>
> http://lea.hamradio.si/~s53ww/xvrt/xvrt.htm
>
> Enjoy reading!
>
>
> Adi
>
>
>
> ----- Original Message -----
> From: "Bill Coleman" <[hidden email]>
> To: "S55M" <[hidden email]>
> Cc: "Elecraft" <[hidden email]>
> Sent: Wednesday, March 23, 2005 12:38 AM
> Subject: Re: [Elecraft] 14361!
>
>
> >
> > On Mar 22, 2005, at 4:22 PM, S55M wrote:
> >
> > > If You look at the characteristics of HF common radios You will see
> > > the huge
> > > difference between the preformance on 28MHz and 14MHz for most
> > > commercial
> > > equipment and -hence-there is no technical reason for that!.
> >
> > Isn't the dynamic range of the system really limited by the dynamic
> > range of the transverter itself, rather than by the transceiver it is
> > connected to?
> >
> > Seems like, with the extra RF amplification and mixer stages in a
> > transverter, there's more room for dynamic intermingling of signals
> > that would cause an overload -- especially when you consider the
> > transverter is typically several hundred kHz wide.
> >
> > Bill Coleman, AA4LR, PP-ASEL Mail: [hidden email]
> > Quote: "Not within a thousand years will man ever fly!"
> > -- Wilbur Wright, 1901
> >
>

Geoffrey Mackenzie-Kennedy-2

Re: 14361!

In reply to this post by Bill Coleman-2

Agree about coverage, but 350 - 500kHz is ample for my particular interests.
I think that I chose an IF of 14 MHz for 6m and 2m for reasons of receiver
spurious responses or transmitter spurii, or both, but as the choice was
made about 50 years ago I won't swear to this before re-running an analysis.

73, Geoff.
GM4ESD

----- Original Message -----
From: "Bill Coleman" <[hidden email]>
To: "S55M" <[hidden email]>
Cc: "Elecraft" <[hidden email]>
Sent: Tuesday, March 22, 2005 8:44 PM
Subject: Re: [Elecraft] 14361!