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

["Markus Vester" <markusvester@aol.com>]

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: jcraig@mun.ca

Sent: Friday, January 10, 2014 8:21 PM

To: rsgb_lf_group@blacksheep.org

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: jcraig@mun.ca
> Sent: Friday, January 10, 2014 7:44 PM
> To: rsgb_lf_group@blacksheep.org
> 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 jcraig@mun.ca:
>>>
>>> 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
>>>
>>>
>>
>>
>>
>>
>>
>
>