[Elecraft] preamp for using an SDR as a pan adapter

[Bob McGraw K4TAX]

In a word, YES.   I find that to be true with my K3S as well as other 
brands/models of radios.   Thus you'll need about 20 dB of gain in the 
form of a preamp between the IF output and the QSR receiver.

73

Bob, K4TAX


On 10/4/2019 12:57 PM, Fred Massey wrote:
> Some.  I was planning on sending an email to Elecraft support with the s/n
> of my K3s to see if I needed the mod.  The difference I’m seeing in signal
> strength is about 20+ dB.  Is it normal for the if-out to be weaker than a
> direct connection to the antenna?
> 73,
> Fred
> AE4ED
>
> On Fri, Oct 4, 2019 at 12:44 PM Don Wilhelm <donwilh at embarqmail.com> wrote:
>
>> Fred,
>>
>> Have you looked the K3 IF Output mod?
>>
>> https://ftp.elecraft.com/K3/Mod%20Notes%20Alerts/IF_Output_Buffer_Gain_Mod_Rev_A.pdf
>>
>> If you don't have the 13k SMD resistor or a 1/8 watt 13k resistor, you
>> can order the kit from Elecraft.
>>
>> 73,
>> Don W3FPR
>>
>> On 10/4/2019 1:24 PM, Fred Massey wrote:
>>> Good afternoon Wes and all,
>>>
>>> If I connect the antenna directly to the QSR-1, I get the same signal
>> level
>>> as the K3s.  But, when I connect to the QSR-1 to the IF-out, the signal
>> is
>>> about 4 s-units less.
>>>
>>> Any ideas...anyone?
>>>
>>> Fred
>>>
>>> On Thu, Oct 3, 2019 at 4:14 PM Wes <wes_n7ws at triconet.org> wrote:
>>>
>>>> I use an SDR-IQ on the i-f output on my (very) early K3S.  it works
>> fine.
>>>> IIRC,
>>>> always a dubious proposition, I did the mod on my original K3 and it
>>>> worked well
>>>> too without any additional amplification.  I think you have another
>>>> problem.
>>>>
>>>> Wes  N7WS
>>>>
>>>> On 10/3/2019 2:01 PM, Fred Massey wrote:
>>>>> Good afternoon,
>>>>>
>>>>> I have successfully connected my QSR-1 to my K3s if-out, and
>> immediately
>>>>> noticed the signal strengths showing on the QSR-1 were much weaker.  I
>>>>> probably have an early K3s, so the if-out signal strength is even
>> weaker.
>>>>> Any recommendations at a good preamp to use?  It seems like 20db is
>> what
>>>> I
>>>>> need:
>>>>>
>>>>> 73,
>>>>> Fred
>>>>> AE4ED
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