[Elecraft] Re: k2/100 topband operation

[Hank Kohl K8DD]

At 12/16/2003 08:22 AM, BarryG wrote:


>Topband related question: are K2 users running an unamplified Beverage 
>straight into their K2's rx ant jack?  I tried a K2 about two years ago 
>and the rf/if gain coupled with the AGC threshold was insufficient for the 
>straight-in Beverage.  If I cranked the gain to hear weaker signals on the 
>Beverage, I would blow out my eardrums if a strong signal came on 
>frequency.  Was wondering if this issue has been addressed in the 
>intervening time period?
>
>Thanks & 73,
>Barry N1EU

Normally a beverage doesn't need a preamp, but run a beverage straight into 
the K2?  No, I wouldn't do that.  An unmatched beverage would be down 
another 10 or so db.  It should have a 9:1 transformer at the feedpoint and 
run CATV coax into the shack.  Then you probably would not need a 
preamp.  I would put a pair of 1N34A's from the beverage feed to ground 
(one pointing each way) to take any RF off the RX antenna.

CATV coax?  Sure .... it's 75 ohm and it's double shield - all the better 
to keep extraneous pickup out.

Flags, pennants and EWE's are probably 30 db down.   I have a remote 
preamp/BC filter for EWE's that I bought from some K2 that was making them 
right after the first EWE article came out in QST.  It brings the RX level 
up to normal.

73    Hank   K8DD