Ham radio, HF propagation, DXCC/WAZ/IOTA, Antarctica
/idata%2F1285336%2F%2F9x0r_1.jpg)
Today I received 9X0R QSL for20/17/15/12m QSO with 100W AND my 17m QRP QSO... I'd like to thank the team for sending a separate QSL as QRP..Indeed, many expeditions don't make the difference between High Power and QRP on QSL labels !!!! Gracias ! Ron...
Lire la suite/idata%2F1285336%2F%2Fflag_80m_k6se.jpg)
Hi all, While going on workign on the filter + preamplifier, I wanted to post here the RX antenna I plan to build for 40/80m... This is highly inspired from K6SE flag antenna, but I wanted to make it shorter to see how are impacted the over-all performances....
Lire la suite/idata%2F1285336%2F%2F25072008-002-.jpg)
So here we are, this is a picture of the "test filter" : As you may see, I added 68 pF capacitors in parallel of the 680pF on the 40m filter, this sharpens the bandwidth, while increasing slightly the insertion losses. Corresponding schematics :(measured...
Lire la suite/idata%2F1285336%2F%2Frfsim_schemtics_80m_filter.jpg)
80m bandpass filter simulation 29µH ---- 68 pF ---- 68 pF ----58 µH ---- 68 pF ---- 68 pF ---- 29 µH 680 pF 680 pF gnd gnd This should look like : Now, the coil fabrication (same method as for the 40m bandpass filter !!!!!!) Once again, exactly 29.00µH...
Lire la suite/idata%2F1285336%2F%2F9L1btb.jpg)
I already got 9L1 on 20m, but 17m was a brand new band. Thanks Zbig !!!!!!!!!!!!!! Ronan
Lire la suiteAs for many expeditions, I QSO this one the very last day, on 20m (the only exception was for Clipperton, TX5C, on 17m, HI ). Yesterday was the very first day I heard them so well (peaking 5/5), but all EU stations were shouting a thim in the small +5...
Lire la suite/idata%2F1285336%2F%2F40m_bandpass_filter_curve.jpg)
40m bandpass filter simulation (RFSIM99) 8.2µH ------ 68pF ------ 68pF ---------- 16.4µH ---------- 68pF ----------- 68 pF -------------8.2µH 680 pF 680pF gnd gnd A few pictures of the 40m band-pass filter finally adjusted today: Coisl are made from T106-2...
Lire la suite/idata%2F1285336%2Fhf-preamplifier_picture.jpg)
Hi all, I feel like building a HF preamplifier for the low bands (at least 40 and 80m), in order to increase the signals of the Flag antenna I'm planning to build. The HF transistor( is a simpoe bipolar from NEC (NE46134), and the circuit has been optimized...
Lire la suiteThat was a fight to get through the big pile-up with my 100W only...!!!! I was listening to Rafiq from the beginning of the week working on 40m at around 20:00z. But each time he was calling EU, there was a BIG BIG mess, zoo, or whatever other words,...
Lire la suiteHi again, Most of you (in EU at least) have heard/QSO with Svein who is now JX9JKA in Jan Mayen isl. I couls QSO with him on all bands from 20 to 10m, incl WARC, with even a QRP QSO on 17m. I look for him now on the low bands !!!! Svein will stay there...
Lire la suite