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Re: LF: Hartmut's Grabber -- QRP TA

To: <[email protected]>
Subject: Re: LF: Hartmut's Grabber -- QRP TA
From: "Markus Vester" <[email protected]>
Date: Sun, 12 Jan 2014 01:32:13 +0100
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Joe,
 
can't really say I'm seeing much here so far. Not even in 438 µHz, except for a couple of dim pixels in a row around 21 UT. Hartmut's grabber is doing much better at 11 mHz!
 
Best 73,
Markus (DF6NM)

Sent: Saturday, January 11, 2014 8:33 PM
Subject: Re: LF: Hartmut's Grabber -- QRP TA

Hi Markus,

Carrier on since 1920 UTC. 5 watts.  While looking at the messy breadboard
and trying to draw the schematic, I decided that it would be quicker to just
run the Decca using the power supply for the class E amp at reduced
voltage.

73 & GL
Joe VO1NA

On Fri, 10 Jan 2014, Markus Vester wrote:

> Yes Joe, 100% duty cycle would be ideal. But occasional CW or QRSS id's won't hurt either, as long as phase is being preserved.
>
> 73, Markus
>
>
> From: [email protected]
> Sent: Friday, January 10, 2014 8:21 PM
> To: [email protected]
> Subject: Re: LF: Hartmut's Grabber -- QRP TA
>
>
> Hi Markus,
>
> That is most interesting.   I remember that occasion when TX was on later
> than usual.  It will take a bit of tinkering to get the phase coherent exciter
> to the class E TX, but this is long overdue anyway.  Would you like
> a continuous QRP carrier without any keying?
>
> Best Regards
> Joe VO1NA
>
> On Fri, 10 Jan 2014, Markus Vester wrote:
>
>> Joe,
>>
>> when you were sending CW a couple of days ago, the coherent carrier was detectable in my 438 uHz spectrogram in broad daylight, until 12 UT! So I'm wondering how a low power straight carrier would fare during night and day?
>>
>> Best 73,
>> Markus
>>
>>
>>
>> From: [email protected]
>> Sent: Friday, January 10, 2014 7:44 PM
>> To: [email protected]
>> Subject: Re: LF: Hartmut's Grabber -- QRP TA
>>
>>
>> Hi Hartmut,
>>
>> Yes, DCF39 must be a real pest as it is so close geographically and
>> in frequency. You seem to be dealing with it very effectively.
>> Thank-you for running the grabber.
>>
>> It's a pest over here too, but sometimes useful to check the RX system.
>>
>> The TX will be on again tonight. In keeping with the spirit of energy
>> conservation being requested by our power company, the TX will run
>> at <5 watts tonight to the 100m wire.  I hope to watch for the signals
>> on your grabber.
>>
>> Cheers
>> Joe VO1NA
>>
>> On Fri, 10 Jan 2014, Hartmut Wolff wrote:
>>
>>> Hello Joe,
>>>
>>> thank you for your kind words!
>>>
>>> Still struggling here with my local Pest DCF39. Between 03:15 and 04:40 UTC
>>> DCF39 was sending a higher pulse frequence. That is the reason of the higher
>>> noise level at that time and poorer reception of your beacon.
>>>
>>> Thank you for your signal!
>>>
>>> 73
>>> Hartmut
>>>
>>>
>>> Am 2014-01-10 13:26, schrieb [email protected]:
>>>>
>>>> Hello Hartmut and Group,
>>>>
>>>> Even with only 65 watts from the TX, strong QRSS100 signals were seen on
>>>> Hartmut's grabber at 137.777 so the power was cut to <10 watts by
>>>> reducing the drain voltage of the class E amp to 12 V. The grabber
>>>> traces faded substantially, but rebounded to clearly readable around
>>>> 0630 utc.
>>>>
>>>> Congrats on your impressive RX setup, Martmut!
>>>>
>>>> 73
>>>> Joe VO1NA
>>>>
>>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>
>

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