Message-ID: <4FE201B2.6030102@iup.uni-heidelberg.de>
Date: Wed, 20 Jun 2012 19:00:34 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3
MIME-Version: 1.0
To: rsgb_lf_group@blacksheep.org
References: <4FE0ED02.4080903@iup.uni-heidelberg.de>,<4FE0EF87.8060905@kpnmail.nl> <7E7DFBB4D102A04DB5ADC88D66628A4A0FAB195C@ICTS-S-MBX5.luna.kuleuven.be>,<4FE100DB.60809@iup.uni-heidelberg.de> <7E7DFBB4D102A04DB5ADC88D66628A4A0FAB1C6F@ICTS-S-MBX5.luna.kuleuven.be>
In-Reply-To: <7E7DFBB4D102A04DB5ADC88D66628A4A0FAB1C6F@ICTS-S-MBX5.luna.kuleuven.be>
Subject: Re: LF: RE: Test signal needed
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: quoted-printable
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org
X-AOL-SCOLL-URL_COUNT: 0  
x-aol-sid: 3039ac1d410b4fe202815d57
X-AOL-IP: 195.171.43.25
X-AOL-SPF: domain : blacksheep.org SPF : none


Hi Rik,

Am 20.06.2012 08:28, schrieb Rik Strobbe:
> About the TX antenna used as RX antenna: that often works fine if you d=
o not overload the RX (BC at 525kHz+). I always use the 20dB attenuator o=
f my good old TS440 to RX on my 11m high / 25m ling Lazy-L antenna.
Well, didn't measured yet but i think the transmit antenna is very=20
selective too. Anyway the signal levels may be to high in the near BC=20
region.
I've checked the filter curves in my small active antennas. Both, the=20
ferrite and the E field antenna are resonated, the E field antenna uses=20
a L to ground in front of the first gate.

These are the curves:
Active ferrite antenna: https://dl.dropbox.com/u/19882028/MF/MFferrite.pn=
g
Active E field antenna: https://dl.dropbox.com/u/19882028/MF/MFactiveE.pn=
g

The main aspect is to filter DLF at 153 kHz which causes much trouble=20
here...

Also my receiver is selective it selfe. As i said, 500 kHz is already 30=20
dB down...

>   As long as the band noise is above the RX noise you won't loose any s=
ensititity.
>   =20
That's clear. But "band noise" is not so easy to find here. It's always =20
the question what the man made noise part is. However this seems to be=20
less critical on MF than on LF, as others already said..

73, tnx, cu

Stefan/DK7FC

> 73, Rik  ON7YD - OR7T
> ________________________________________
> Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep=
.org] namens Stefan Sch=E4fer [Stefan.Schaefer@iup.uni-heidelberg.de]
> Verzonden: woensdag 20 juni 2012 0:44
> Aan: rsgb_lf_group@blacksheep.org
> Onderwerp: LF: Test signal needed
>
> Rik, MF,
>
> Right now i'm testing the TX antenna as a RX antenna. This works much
> better than expected. A 10 dB attenuator is needed but no problem. Mayb=
e
> you can give me a test signal again on 502 kHz, or someone else?
>
> It looks like the QRN is much lower on that antenna. That means that
> many of the crashes during my CQ calls have been charged rain drops tha=
t
> were falling on the E field probe, just my guess.
>
> I will listen another 20 min. on 502 kHz and apprechiate any test
> signals from amateurs.
>
> 73, Stefan
>
> Am 19.06.2012 23:53, schrieb Rik Strobbe:
>   =20
>> actually 501.2kHz.
>> Stefan, I have replied to your CQ several times, but no luck.
>> You are 579 with the usual QSB.
>> I am running 150W into a 11m high / 25m long lazy-L antenna, estimared=
 ERP abt 1W.
>>
>> 73, Rik  ON7YD
>>
>> ________________________________________
>> Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blackshee=
p.org] namens pa3abk [pa3abk@kpnmail.nl]
>> Verzonden: dinsdag 19 juni 2012 23:30
>> Aan: rsgb_lf_group@blacksheep.org
>> Onderwerp: Re: LF: CQ on 476.5 kHz CW
>>
>> Lsn fer OR7T on 502 pse
>> Jan/pa3abk
>>
>> On 19-6-2012 23:20, Stefan Sch=E4fer wrote:
>>
>>     =20
>>> just in case someone wants...
>>> I will call until 22 UT if no one replies...
>>>
>>> 73, Stefan/DK7FC
>>>
>>>
>>>
>>>       =20
>> --
>> pa3abk<->   dordrecht jo21it
>>
>>     =20