I have an ex-something amplifier with a nice heatsink and a lot of BD545Ds and BD546Ds. I can't find any data on these devices - can anyone help? BD454D : - NPN - TOP66 package - Vcb max = 120V - Vce
Over the past years I got a small collection of articles about 136kHz or related topics. Last night I did put the information together and placed it on my web-page : http://www.qsl.net/on7yd/136lit.h
At 13:19 10/03/00, I wrote: BD454D : - NPN - TOP66 package - Vcb max = 120V - Vce max = 120V - Veb max = 5V - Ic max = 15A - Ft min = 3MHz - Hfe = 25 minimum Must be BD545D, data are correct. 73, Rik
searching for information about umbrella antennas I came across following reference : Folded Umbrella Antenna (WB5IIR) Ham Radio Magazine, May 1979 p.38 Anyone who has this magazine and can check if
Try a HVK1/2 relais, Specifications say 8kV (dc) switching voltage. I used it at work upto 15kV (at 8kHz) when it was swiched 'cold' (remove signal -> switch relay -> put signal back on). I think tha
I'm very surprised by the activity on 71.8kHz and the distances covered. It's a pitty we started this activity so late as the band will be withdrawn in a few months. We probably never will know the l
For those who want to use their 72kHz TX antenna as a 136kHz RX antenna there might be an easy solution that does not require a 'many kV' relais : Assume your antenna has 500pF capacitance. This mean
DCF77 in located in Mainflingen near Frankfurt (50° 01' north, 09° 00' east). -- From: John Rabson[SMTP:[email protected]] Reply To: [email protected] Sent: 2000-03-21 22:23 To: rs
In my previous mail I forgot to mention that 'parallel tuning' of the antenna will only work with a high-impedance RX input (FET-preamp). For 50 Ohm input series tuning can be used (an additional ser
Being very close to applying my 136kHz DXCC (only 82 more DXCC countries needed) I was also very worried about this. Although QRSS is CW and as far as I know nothing is said about the transmitting s
I wasn't aware that the word is not known in English. It has Russian origin (as far as I know) and was used for high ranked party member taking decisions without being influenced by any practical kno
I have a sked with Peter (G3LDO) for a CW x-band QSO (136/72kHz) tomorrow (Friday) from 06.00 to 06.30 UT. I will listen on 71.8 and transmit 137.1kHz. If signals are good the QSO with Peter could be
I think that Uli, as several other DL's, is a victim of the 'Rhein-Main Syndrome' : due the the high concentration of high-power LF stations in that area the noiselevel seems to be extremely high and
If you (re)match for the same applied power, the gain by having lower loop resistance is 20log(R1/R2). Your data indicates a gain of +0.7 dB from resistance ratio. I think it should be 10log(R1/R2) :
Hello Magne, Is it possible for you to have some announced test transmisions this week (during evenings and/or mornings). If we know when (and on what frequency) you will be transmitting I am sure th
Hello Magne , I looked out for you last night, but without succes. Take into consideration that most of you are 1000 km away or more. Only OZ, SM and a couple of OH-stations are closer than that. Bas
Hello Peter, attached you find a drawing of my antenna. As you will see I not much of an artist but I hope the picture gives you an idea how my antenna is constructed. Some explanation : N = nylon ro
Oops, I did it once more. The previous mail was meant to be sent directlty to G3LDO instead of to the reflector. Sorry for the inconveniance. 73, Rik ON7YD
Auroral conditions must have been expectional on Thursday night (April 6th) as we had VISUAL aurora borealis (arround 22UT) in central Belgium. But I noticed no propagation enhancement on LF. 73, Rik
Bob, The topload is abt. 23m long and at a height of 11m (with 1m 'sack' in the middle. 73, Rik unless I missed it what is the length of your antenna, and the drawing is very good Bob On Fri, 07 Apr
