[Elecraft] Re: k2/100 topband operation

[BarryG]

I guess I should have specified a coax-fed Beverage with matching xfmr instead of "straight into".  I'm asking if folks are using external preamps on their low gain receive antennas, such as Beverages.  So far two respondents have indicated in the affirmative.  Back-to-back diode protection is a good idea Hank!

Thanks & 73,
Barry N1EU



--- On Tue 12/16, Hank Kohl K8DD < k8dd@arrl.net > wrote:From: Hank Kohl K8DD [mailto: k8dd@arrl.net]To: n1eu@myway.comDate: Tue, 16 Dec 2003 14:31:59 -0500Subject: Re: [Elecraft] Re: k2/100 topband operationAt 12/16/2003 08:22 AM, you 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.


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