There have been a number of postings about the poor response of amateur radio receivers on 136kHz. The main reason for this lack of performance is usually the internal attenuator that is switched in
Hi David, In order to improve the sensitivity for regular Amateur (Ja- Rig) a PreAmp is needed. I was looking at Your homepage and found such a Pre- Amplifier. Could You tell me, whats the Value for
Guck mal auf diese Seite: http://www.qsl.net/in3otd/bpfiltex1.html 73 bernd Hi David, In order to improve the sensitivity for regular Amateur (Ja- Rig) a PreAmp is needed.I was looking at Your homepa
Aplac findest Du bei: http://www.elektronikschule.de/~krausg/ 73 "Uwe Wensauer" <[email protected]> schrieb: Hi David, In order to improve the sensitivity for regular Amateur (Ja- Rig) a PreAmp is
In a message dated 08/01/2005 13:06:07 GMT Standard Time, [email protected] writes: "Uwe Wensauer" <[email protected]> schrieb: Hi David, In order to improve the sensitivity for regular Amate
Dear LF Group, Getting back to the FT-817, is it possible to modify the front end or first mixer so that a preamp would be unnecessary? For those interested, the "Burhans" preamp schematic can be fou
Joe, I cannot find Mitch's web site, can you direct me there please, I would like to see the Burhans preamp. Regards Gary - G4WGT Web: http://myweb.tiscali.co.uk/wgtaylor --Original Message-- From: o
I cannot find Mitch's web site, can you direct me there please, I would like to see the Burhans preamp. Regards Gary - G4WGT Gary: Try http://technology.fanshawec.on.ca/eltn124/loops.htm and a rough
Getting back to the FT-817, is it possible to modify the front end or first mixer so that a preamp would be unnecessary? Many RTX uses inexpensive diodes in the front-end design, for bandpass filter
Even 1N4148 doesn't add more attenuation than a fraction of dB. so I really doubt the statement, the only real problem is possible intermodulation 73 Jan-Martin, LA8AK --Opprinnelig melding-- Fra: ow
Many receivers probably have a high pass filter to reduce strong broadcast signals below 1.6MHz Andy G4JNT 73 Jan-Martin, LA8AK --Opprinnelig melding-- Fra: [email protected] [mailto
So there might probably not be any problems at all... 73, Jan-Martin LA8AK --Opprinnelig melding-- Fra: [email protected] [mailto:[email protected]]På vegne av Andy
Claudio, I am a little confused. It is true that the minority carrier lifetime is short compared with the LF waveform period but surely this only really has any effect if you are trying to use the PI
Dear LF Group, I think Jan-Martin is right about the PIN diode losses - at LF they will just work as "ordinary" diodes which won't greatly affect their loss - although they will lose their advantages
I'm sure some people have described mods where this transformer is changed to improve LF performance, but I can't think who at the moment. http://www.mods.dk/view.php?ArticleId=2711 73 Alberto I2PHD
Dear Jim and Alberto and LF group, Thank-you for the info. I well remember reading Alberto's article. The schematic of the FT-817 shows about 6 switching diodes and some shunt 100 uH chokes and serie
