For the members of the LF group , After an extensive investigation by Aad PA3BBS and myself PA0WFO we have the circuit diagram and the specs of the sandpapered driver IC and the specs of the fets in
To the members of the rsgb LF group . Those of you who own the ROPEX TX will have the following experience : The blower of the set is making so much noise that it is sometimes difficult to copy the r
Mal and the LF group , The problem is known Mal (caused by the protection circuit which measures the current to the antenna terminal ) but as the total resistance in my antenna system is 65 Ohms I ca
To Mal and the rest of the members of the LF group Tnx for your warning about the protection of the finals Mal . In my case the 1010,s did not explode without proper drive but only made a lot of nois
To the members of the LF group , As suggested by Mal G3KEV it is wise to fit a protection circuit in the modified ROPEX which prevents keying the transmitter in case of no drive caused by a disconnec
Steve, The Siemens RS1003 is used in the Rohde&Schwarz ( German made ) valve transmitter type SK-010 as described in the Surplusradio bulletin no 18 february 2000 from the dutch surplus radio society
Hi Mal , Thought you were gone to a different location during the summer . Did not hear any straight CW either of late . Hope to meet you soon on the band . Perhaps you are successfull to shake the L
To all , Herewith confirm reception of the signal of SAQ a little while after 12.30 UTC Today . Had the impression that the speed of the alternator had to be adjusted as the frequency had to settle a
Dear Peter , Sorry to hear you leaving 136 Khz before we made our first QSO with manual CW . I was inspired by your books and my radiofriend Dick PA0SE to give it a try on that band .Looking forward
To all , Heard the special event station MB2HFC with manual CW this morning with signalstrenght 7 . I could not make a contact with my 150 Watts . Perhaps a high noise level at MB2HFC ? 73, William P
Hello Om Roelof , I,m also interested in your mini Whip . Pse be so kind to mail me the pdf . 73,William PA0WFO -- Original Message -- From: "Roelof Bakker" <[email protected]> To: <rsgb_lf_group@b
Dear Lars , Did hear your SAQ transmission of 1300Hrs UTC . Signal strenght 2 S points above noise in 300 Hz bandwidth with QRM. Rx Drake R7 with active antenna 30 cm,s long, more or less like PA0RDT
Dear All , In my Ropex transmitter I have a class D PA with 2 power fets Fairchild RFP 70N06 with rather generous ratings 70 Amps each and a max voltage of 60 Volts the supply voltage is 13.8 Volts a
Dear Jim , LF group . Tnx for your explanation of what happens inside the FETS . after reading your comment and of several others I think it will be wise to measure the SWR between the TX and antenna
Good luck Martin , Hope to hear your results , 73, William Oorschot PA0WFO -- Original Message -- From: "Martin Evans." <[email protected]> To: <[email protected]> Sent: Monday
Hi Martin , I am using a rather old Kenwood TS940 with Dave,s pre- amp which performs very well with a built in 270 Hz crystal-filter combined with the built in Audio Peak Filter which reduces a lot
Hi Geri , Heard your beacon last Sunday evening in plain CW with a signal strenght of 6-10 Db over the noise in a bandwidth of 300 Hz in my Drake R7 receiver with an active antenna more or less like
To All , Lacking a "Q"meter I use the following procedure : Connect the coil in series with a variable capacitor to a noise bridge with the RX output of the bridge to a receiver ( small bandwith of a
Dear Jim , I,m very interested in the spreadsheet in Exel to check the results of my experiments . 73, William PA0WFO -- Original Message -- From: [email protected] james moritz To: rsgb_lf_grou
