[Lowfer] SAQ 'extra transmission' in CT

[jrusgrove at comcast.net]

Zack

Sorry for delay in getting back ... it took a while to find the info.

The following measurements were posted here back in 2006 ... man, time flies! The CP666 was used in 
both the 'Amrad article' and the 'W1VD built' copy. The CP666 was then swapped out to a J310 and 
tested at both 12 and 24 VDC. BTW, one can run two J310s in parallel to pick up another couple / few 
dB. This increases the overall input C which negatively impacts very low frequency response. Hope 
the columns below make it through the reflector intact.


                      Amrad article         W1VD built         J310 12volt       J310 24 volt


1 dB comp.    +25 dBm                +25 dBm            +17 dBm          +18 dBm

IP2                +53 dBm*              +60 dBm             +50 dBm         +60 dBm

IP3                +37 dBm               +36 dBm              +32 dBm         +32 dBm


* possible measurement error

Jay W1VD  WD2XNS  WE2XGR/2




>
> ----- Original Message ----- 
> From: "Zack Widup" <w9sz.zack at gmail.com>
> To: "Discussion of the Lowfer (US, European, &amp,UK) and MedFer bands" <lowfer at mailman.qth.net>
> Sent: Wednesday, July 02, 2014 4:16 PM
> Subject: Re: [Lowfer] SAQ 'extra transmission' in CT
>
>
>> Thanks Jay. BTW I got a few of those CP666 transistors the original article
>> described. Is there any advantage to using them over the J310 (which I also
>> have a lot of)?
>>
>> 73, Zack W9SZ
>>
>>
>> On Wed, Jul 2, 2014 at 12:37 PM, <jrusgrove at comcast.net> wrote:
>>
>>> http://www.w1vd.com/modifiedeprobe.pdf
>>>
>>> Jay
>>>
>>>
>>> ----- Original Message ----- From: "Zack Widup" <w9sz.zack at gmail.com>
>>> To: "Discussion of the Lowfer (US, European, &amp,UK) and MedFer bands" <
>>> lowfer at mailman.qth.net>
>>> Sent: Wednesday, July 02, 2014 11:12 AM
>>> Subject: Re: [Lowfer] SAQ 'extra transmission' in CT
>>>
>>>
>>>
>>>  Hi Jay,
>>>>
>>>> Just curious - which modified E probe circuit are you using?
>>>>
>>>> 73, Zack W9SZ
>>>>
>>>>
>>>> On Wed, Jul 2, 2014 at 9:53 AM, <jrusgrove at comcast.net> wrote:
>>>>
>>>>  July 2, 2014 reception was slightly down from 'normal' and about on par
>>>>> with the Jun 29 2014 transmission last weekend. A short .mp3 of the
>>>>> tuneup
>>>>> session with the ID curiously sent as QAS!
>>>>>
>>>>> http://www.w1vd.com/SAQ070214.mp3
>>>>>
>>>>> Same receiving setup as usual:
>>>>>
>>>>> Modified Amrad E probe (1 meter)
>>>>> LNA
>>>>> Delta 44 A/D converter
>>>>> Spectrum Laboratory
>>>>>
>>>>> Jay W1VD  WD2XNS  WE2XGR/2
>>>>>
>>>>>
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