[Elecraft] 14361!

[S55M]

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" <aa4lr at arrl.net>
To: "S55M" <s55m at siol.com>
Cc: "Elecraft" <elecraft at mailman.qth.net>
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: aa4lr at arrl.net
> Quote: "Not within a thousand years will man ever fly!"
>              -- Wilbur Wright, 1901
>