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LF: EA in LF NOW !

To: "[email protected]" <rsgb[email protected]>
Subject: LF: EA in LF NOW !
From: VIGILANT Luis Fernández <[email protected]>
Date: Thu, 14 Apr 2016 10:21:48 +0000
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Thread-topic: EA in LF NOW !
Thank you all ! This band is amazing :-)
Great dynamic reports Markus. You are now my ODX at 1500 Km !
>>Eeehm, and what did you run last night? Don't tell me it was just the nacked U3 with, what, 100 mW TX power?

Well, I know it is HARD TO BELIEVE, but that's it. Absolutely. U3 (old, not S) using an ICL7667, not the BS170's which would provide more power
In fact, i'm only using half the ICL7667 powered at 5V. This is good enought to driver the MF PA and do not cause thermal drift in the DDS
Antenna height is the key. The 80m building tower is part of the antenna, so it works as a top coil feeded, top capacitive loaded 90m vertical antenna
The radiation angle must be also quite low, which is another interesting factor. Now I'm completely sure I bought the right house for a Ham point of view ! ;-)
Let's keep the system running a few more days. Still working in daylight in Opera32. There is time to test other modes too
Then the next issue (appart of PA) will be a switching system to be able to alternate Tx periods in MF and LF. Think it will be doable using small power
and vacuum relays. It's a pity to be forced to choose to Tx in only one band
73 de Luis

De: [email protected] [mailto:[email protected]] En nombre de DK7FC
Enviado el: jueves, 14 de abril de 2016 11:39
Para: [email protected]
Asunto: Re: LF: EA in LF soon

Hi Luis,

My congrats again!

Am 14.04.2016 08:45, schrieb VIGILANT Luis Fernández:

Looks very promising. Let's see what happen when using an small PA

Eeehm, and what did you run last night? Don't tell me it was just the nacked U3 with, what, 100 mW TX power?

And what about WSPR-15 ? It would be nice to see you there too. I find the SNR information more informative in WSPR-15 :-)

73, Stefan

PS: Time to leave traces over the pond i would say, when you have the PA ready. 6000 km on LF is much easier then 6000 km on MF!

Will keep it running during daylight also

73 de Luis
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