... and 559 with some QSB here in PA. Tnx for the QSO @ 17.00 UTC Regards, Minto pa3bca From: [email protected] Lubos OK2BVG Sent: Thursday, December 23, 2010 18:15 To: [email protected]
Hi Mal, It seems that I am not the only one that has been kept in the dark. There is still no official word that 500 is open to us again, but the scuttlebutt is that the powers that be did approve ou
Mal, Yes, putting several in parallel means that the total capacitance that the driver stage sees (sum of gate capacitances and the reverse transfer capacitances) increases so more power is needed to
Hi Stefan, Thanks for the reference. Interesting schematics, but it is used to produce amplitude modulation. Feeding it PSK31 @ 500 KHz from the soundcard isn't going to get me very popular I suppose
J310's are still plenty available (at least her in PA country...) 2N5109's however are not. A BF199 seems a bit too small for the dissipated power...? I used a 2N3866. seems to work well but I have n
Hello Roelof, Yes at 200 mW there should not be a problem. I use a 2N3866 in my 2 mini-whips, on paper the 2N5109 en the 2N3866 looked comparable enough (as far as I remember). The mini-whip is much
Yup that is correct. High(er) voltage fets usually have the higher RDS-on values... Tradeoff based on physics... I started my 500-600 Watts 500 KHz transverter with two IRFP360's in parallel. Later I
Hi All I just got a PM from Albert PA0A. It seems that members of the PA HAM club VRZA did receive a renewed license for 500 KHz, so they are allowed to TX on 500 again. The VERON (of which I am a me
Gerhard, It is my experience that using a separate resistor for each gate (abt 10 ohms) greatly reduces a tendency for parasitic oscillations. Main cause might be my particular setup but without the
Stefan, You mentioned the IXDD414 in a previous message here on the reflector, and I immediately downloaded the datasheet. The IXDD414 certainly looks very promising and I plan to experiment with it
I am curious how and when they got a renewed license. I have heard nothing from my VERON "600m controller", and nobody I know has either. Maybe Jan pa3abk knows more via the VRZA? (I heard from the p
?Rik, No, 505 is not a typo. In December 2010 the responsible Dutch ministry has published an interim draft for a new frequency plan. There are two relevant changes (for us Dutch radio amateurs): - a
Hi Rik, Thanks for the heads-up. I think your antenna is better than mine, but possibly not by much. I do have another concern however, and that is the high voltage at the antenna. The capacitance at
Hi Mal, 1 KW should be enough for a regular CW QSO I suppose. But on the other hand: my antenna efficiency is very low. I did some calculations with MMANA-GAL and the radiation resistance of my 30 mt
Well, I am all for it.. Now that we (PA) are kicked off of 500 KHz (again!) I needed another challenge. So 136 KHz it is. I have already built a PA for 136. My design is for > 1KW, I have only tested
Stefan (et al), I did listen this morning on 136.8 to see if I could copy you or any other station, but the results were disappointing: I heard nothing. I have no prior experience with 137 KHz so I h
Hi Stefan, good signals tonight. See screenshot. btw, that signal near 137720 on the right, was that you? That was _very_ strong, clearly audible. 73's Minto pa3bca -- Ceterum censeo Carthaginem dele
Roger, Nothing on my grabber either, alas. 137 is certainly not QRN free here in PA, although much better than yesterday. @Stefan: You are vy strong tonight, and audible. 73's Minto pa3bca -- Ceterum
Hi Mal, Further proof that my reception @136 does seem to work (although I need to do some more measurements to determine exactly how good it is....) I did not check (I was too late) to see if I coul
Mal, Please enlighten me, what would you like to have changed? I already have Speclab at QRSS3.... 73s Minto pa3bca -- Ceterum censeo Carthaginem delendam esse From: [email protected] mal hamilto
