Interesting pages, Gary. Haven't known about your VLF pages! And haven't known you were transmitting on VLF! Is the project still up to date? What was your ODX? 73, Stefan/DK7FC Am 16.08.2011 17:37,
Dear Roger, LF Group, As long as the ferrite doesn't saturate am I right in thinking that the use of ferrite rods as coil formers for 137 and 500kHz is basically "a good idea"? I think it would be pr
Hi Jim (et al) Ferrite rods as 5-20W TX loading coils? As long as the ferrite doesn't saturate am I right in thinking that the use of ferrite rods as coil formers for 137 and 500kHz is basically "a g
With the sort of power that you mention, old rx IF transformers, with adjustabe ferrite slugs would suffice, they are made for various IF frequencies, 100, 455, 500, 1600 Khz etc. g3kev -- Original M
Hi All, I am using this method to increase the range of my variometer for 136kHz band, see :- http://myweb.tiscali.co.uk/wgtaylor/LF%20&%20MF%20Experiments%2012.html 73 Gary - G4WGT On 16 August 2011
73, Stefan/DK7FC Am 16.08.2011 17:37, schrieb Gary - G4WGT: Hi All, I am using this method to increase the range of my variometer for 136kHz band, see :- http://myweb.tiscali.co.uk/wgtaylor/LF%20&%2
Mal is spot on with that one. A well-known Chelmsford firm used the technique in some of their tx units. 73 -- 73 es gd dx de pat g4gvw qth nr felixstowe uk (east coast, county of suffolk)
Sliding ferrite rods in and out of coils has been used since radio began to alter inductance. You will find it in radio receiver IF transformers as well as aluminium and brass rods. I have used this
Hello Roger, in the early days of 136kHz I did use a "ferrite rod variometer" for fine tuning the antenna. It was a 700uH coil (abt. 100 winding of 1mm CuL on a 10cm diameter former if I remind well)
Hi Roger this can be done and was written up by Derek G3GRO I think in one of the early (Blue cover) LF Source books that Peter Dodd edited. The message seemed to be to adjust the coil so that for tu
Dear Tom, LF Group, what do you think about an array of many parallel mounted ferrite rods, each of them carrying only a few windigs, all windings connected in series (and then perhaps tuned) and the
Dear Jim, LF Group, thank you for your comments, they confirmed my fears ;-) . Interesting anyway the idea with the vertical array, will test it one day. Tu es 73, Tom, DK1IS
