[Elecraft] K144XV receive gain

[N6JW]

I can certainly confirm this receive gain overcorrection problem on 2m.

The "cpu sleep on rx" upgrade really helped cut back on the birdies. 
Thanks!

But the overcorrection of the 2m gain compensation stands out like a sore
thumb, particularly when one can actually see the relative amplitude of the
signal on the P3.  Of course, this is "just a small matter of programming!"
and I'm sure we will get it right in due course.

Thanks & 73

John, N6JW 



Jeff Cochrane - VK4BOF wrote:
> 
> Hi Terry,
> Thanks very much for posting of those figures.
> Although I do not have test gear that can back those numbers up I can say
> that from my extensive on air testing that indeed, the 2M gain reduction
> was overdone and to somewhere in the region your figures are showing.
> The local (60+Km away) 2M FM repeater was normally S9+30db on earlier
> firmware releases (around release 3.97 or so) on my K3 and once I got to
> firmware revision 4.05 it had dropped to S9+5db, now that I am at revision
> 4.14 it is now S5!
> Nothing has changed at the repeater and all other radios tried with the
> same antenna at my location show at least S9+20db signal strength. (And
> usually full scale, it is an exceptional repeater, over 1500ft high and
> with 50watts output to a 6+db gain antenna, it is almost full scale on my
> handheld in the back yard here!)
> Even allowing that the other radios have optomistic S meters I cannot
> believe that they are all out by so much and by such a consistant amount.
> 
> The overdoing of the 2m gain reduction has been the subject of a few
> emails I have sent to Elecraft and to this reflector and to date I have
> not heard an answer on the subject.
> 
> Jeff Cochrane - VK4BOF
> Innisfail, QLD, Australia
> Elecraft K3# 4257
> 
>   ----- Original Message ----- 
>   From: w8zn at comcast.net 
>   To: elecraft at mailman.qth.net 
>   Sent: Wednesday, November 10, 2010 11:18 AM
>   Subject: [Elecraft] K144XV receive gain
> 
> 
>   After seeing several postings about the K144xv gain and experiencing
> issues myself, I did some testing.
> 
>   Comparing a K3/K144XV on 2m vs 6m.
> 
>   On version 3.97 firmware, on 6m -87dbm yielded a S9 signal with the PR6
> preamp in but the internal preamp off - best setting. On 2m, this yielded
> a S9+5 signal with the internal preamp still off.
> 
>   After loading 4.12 or higher, the same -87dbm gave the same S9 on 6m but
> now only S5 on 2m and still only S7 with the internal preamp on. To
> achieve the same S9 reading, I had to increase the signal level to -72dbm
> with the internal preamp off. The release notes for 4.12 reference a gain
> change on the K144xv and by the results of the 3.97 test I agree, there
> was too much gain but instead of dropping 6 db or so, it appears that they
> dropped 15db. Hopefully this will be rectified in the near future.
> 
>   Terry Price - W8ZN  ex K8ISK
>  
> 
-- 
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