The ceramic fuses in 13A plug tops usually have a 100% overload capabiliy, this was also the case for some of the BT fuses. Ken de M0KHW -- Original Message -- From: [email protected] mal hamilto
Hello Roelof. Thank you for all your help, and I wish you the seasons greetings. 73 Ken M0KHW Hello Ken, I don't think that it is neccessary to use protection diodes. Just try it and when it goes wro
As an addition to my last posting on this subject be careful if you see optical cards for sale at rallies etc, they all should/must have the laser 'starburst' symbol on them, and may be labelled as e
Hi Gary and Roelof. Thankyou for your very useful comments regarding the positioning of the PA0RDT Mini-Whip, I am fortunate that the radio room is remote from the house and has a separate eathing sy
Hi Alan. Phantom circuits are also very useful for signalling, if you use transformers at each end with two balanced windings connected via a capacitor you have many combinations of switching and sig
Optical fibres are fine for transmission and remove all the problems of interference and cross talk at a stroke, but please be careful and observe optical safety precautions when using lasers and oth
If it is red then the optical wavelength is about 850nm, what you also need to know is the type of fibre on the sound card, i.e, multi mode or single mode. Multi mode fibre is usually 50/125 microns
Mal. Brief info at http://english.electronica-pt.com/db/cross-reference.php?ref=BTY96 Ken M0KHW -- Original Message -- From: [email protected] mal hamilton To: [email protected] rsgb S
To all LF Operators. The Seasons Greetings to all LF Operators worldwide. I hope to be on 500kHz more often in 2010, local broadband conditions permitting, my QTH is about 3km from the serving exchan
Hi Stefan. 150dB/km, is a very high loss for modern fibre, even thhe early 850nm multimode fibre was only 1 or 2dB /km and modern single mode fibre at 1300nm or 1550nm the attenuation is substantiall
Hi Stefan. Thanks for the reply, if you know anyone in the telecoms industry try and obtain some off cuts of fibre, either 50/125 multimode, or 8/125 single mode, the first figure is the core diamete
Hi Jim. I think I could knock up a quick 9kHz RX here in Luton over the weekend if that would help. I have been following this thread with interest, could you put up some diagrams etc of your paralle
Hello Pete and others. I would be gratefull (and probably many others) if someone could write some very simple one liners on what is required and how to use a sound card for a 9kHz RX. Don't need pag
Hi Tim. Iuse my 102ft doublet with 8m of 430 ohm feeder as a 'T' antenna loaded with a variometer, and an earthing system of 36 radials of varing length in a 270 degree pattern. The variometer consis
If I could overcome my broadband problems I would be on 500kHz on a regular basis. 73s. Ken M0KHW -- Original Message -- From: [email protected] M0FMT To: [email protected] rsgb_lf_group@b
