Hi all at LF, Still got problems with antenna, SWR looks OK on meter & changes when I tune variometer coil but PA mosfets get very hot but only warm on dummy load, also I have no antenna current (was
Hello to all at LF, Had to abandon testing last night due to antenna fault. I think I have found the problem (connector s/c) but I am only giving short duration tests tonight, I will possibly resume
Hi to all at LF again, Sorry, I did not include a frequency for my test transmission, it will be on or near 137,650 Khz. 73 Gary - G4WGT -- Outgoing mail is certified Virus Free. Checked by AVG anti-
Hi to all at LF, Power supply upgrade completed (as previously reported), replaced PA MOSFETS distroyed during bench testing, also replaced damaged RF ground return cap (output transformer centre tap
Hi Mal, I am using Argo, QRS & Spectrum Lab with Windows XP Home and no problems. 73 Gary - G4WGT. --Original Message-- From: [email protected] [mailto:owner-rsgb_lf_group@blacksheep
Hi Marek, Regarding your comments, when I was recently testing my Tx & antenna I accidentally touched the LF antenna loading coil & I recieved an RF burn to the surface of my finger it did not feel l
Hi to Jim (M0BMU) & all at LF, I had my first LF QSO last night (sunday 14th) after Jim (M0BMU) called me when I was doing some final testing using the G0MRF 300 watt Tx on its highest setting, this
Hello again to all at LF, Happy New Year to you all. I have had a few days away over NY so I had quite a lot of e-mails to look thro'. I see that there has been some debate on antenna's again which s
Hi all at LF, Can anyone advise me regarding using an external vfo on the 300 w transmitter external vfo option. Has anyone used this feature? Connecting to the external vfo input pin produces no out
Hi Jim & LF, I am using a core from a VGA computer monitor scanning coil yoke for the core in my LF antenna matching transformer wound with 2.5 mm mains wire with 10 turns primary & 20 turns secondar
Hi to Mal & LF Group, What Mal has said reminds me of when I used to do TV repairs in the days of VALVES (before solid state). A TV which I had on the bench monitoring for a fault must have had a fau
Hi All at LF, Monitoring with Spectrum Lab QRS10 started at 2315 gmt saw G3LDO (135,921) very strong and first capture at about 0045 gmt showing RU6LA (135,922.5 according to my screen using Peter's
My suggestion is to use the mast as a support for a vertical arrangement. Connect all horizontal wires regardless of configuration together at the top of your 14 metre mast and use a vertical drop l
Hello Jim & LF Group, Thank you for your recent e-mail, I have seen your design in the recent past but did not give it much thought, but I see from your comments & reading the associated article http
Hi to all at LF, Thank you for all the replies, tips & advice, some very en-lightening comments. I have started very simply by constructing the design shown in the LF Experimenters Hand Book by Peter
Hi all at LF, I have been conducting tests with QRS & DFCW now that I have completed the DDS VFO & the antenna is back up after storm damage & everything seems to be ok. The main reason for this e-ma
Hi to David, Laurence, Alan, Jim & anyone else who helped. The DDS vfo was only producing 50 mV at its output pin & coupled with the very changeable output as I tuned accross its range I decided to h
Hello Jim & LF, Thanks for the very useful data Jim, I did in fact get a reply from the organiser of the kit/project & he has stated that several builders have experienced the same low output & have
Hi Alan & LF, The frequency calibration of my DDS VFO is so good (with a little hit & miss twiddling)that it is zero beat with BBC Radio 4 on 198 Khz radio transmission & the freq stability is every
Hi Alan & LF, Thanks for the advise, but I did realise that the input is x2 ie. 274 Khz, it's just that when testing the DDS VFO with the scope on the bench I did the checks at those freq's mentioned
