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Members Introductions / Re: Taking the plunge
« Last post by Carlos2 on December 14, 2025, 07:38:20 pm »Hi again.. forgot me password so had to re register 
Keeping the airwaves alive for the next generation!
News:
Radio Builders Forum Established 10th June 2024
Recent Posts
2
Technical Corner / Re: 12m antenna mast very practical
« Last post by radionortheast on December 12, 2025, 02:09:18 pm »I do remember with the gp, relaying hooked on classics, not everyones cup of tea, never lost the signal went weak, on the hills, you think you’ve lost the signal its just a low part in the music, the stereo sign flicks back on, the music starts up again, classical music with a menotrome beat. On low frequency with a dipole the signal would often be lost you’d get a burst now again, never heard anything like it, still listen to that now, remember when you never lost the signal, the day it was heard everywhere.
Hard to believe it just worked from that chart, with wires taped to some paper tubes, like some epsoide of blue peter with shini, though top part had to 5-6cms shorter, that part was an alumium tube. it was just on top of an old poster tube in the loft, it fell down in the night, easy to repairfound some better way to put it up, the poster was of austria it did reach simliar scenery.
it was still rolled up paper tubes with just wire, barely 3w little tx, was my favourite one of all time, stereo all in, had rds too I turned it off I couldn’t think of a name. I did sometimes put the rds as another frequency, I found abit funny to do that, what mondo fun.
I suppose the gp is quite cute even with 3 legs, if the radials are made of wire outside I suppose bird might land on them, so I guess you'd have to straighten them out again.
Hard to believe it just worked from that chart, with wires taped to some paper tubes, like some epsoide of blue peter with shini, though top part had to 5-6cms shorter, that part was an alumium tube. it was just on top of an old poster tube in the loft, it fell down in the night, easy to repairfound some better way to put it up, the poster was of austria it did reach simliar scenery.
it was still rolled up paper tubes with just wire, barely 3w little tx, was my favourite one of all time, stereo all in, had rds too I turned it off I couldn’t think of a name. I did sometimes put the rds as another frequency, I found abit funny to do that, what mondo fun.
I suppose the gp is quite cute even with 3 legs, if the radials are made of wire outside I suppose bird might land on them, so I guess you'd have to straighten them out again.
3
General Discussion / Re: Radionecks is down
« Last post by MonTaylor on December 11, 2025, 07:07:10 am »looks like the NRG website is back as well....
4
Technical Corner / Re: PCS must be the best PLL rig people now
« Last post by radionortheast on December 10, 2025, 09:15:34 am »ah that explains it, I was kinda thinking there might be some other shop that sells pcs gear were the vat was paid through the website.
5
Technical Corner / Re: PCS must be the best PLL rig people now
« Last post by jvok on December 09, 2025, 08:34:11 pm »6
Technical Corner / Re: PCS must be the best PLL rig people now
« Last post by radionortheast on December 09, 2025, 05:33:23 pm »Hi whats drfs? I saw it mentioned on the old radionecks, it goes to a sofa company when I search for it, is it some way to pay through the website the vat or maybe i’ve got the wrong end of the stick ?
7
Technical Corner / NRG FOUNDER (veronika) Stephen J Moss
« Last post by RIGMO on December 09, 2025, 08:50:24 am »like everything today, capitalism carries on today. the only generator that is resistant to deviation is the seesaw used by Veronika. it is very expensive to produce.. big and clumsy to make, but if you want better than others, this is one solution..
NRG FOUNDER A swing that has not been beaten to this day. NRG (veronika).
Stephen J Moss started to swing 10 years before this article was published. https://dn790002.ca.archive.org/0/items/RadCom_Magazine_1989-06/RadCom_Magazine_1989-06.pdf
For this brilliant invention he is grateful to Rene Mesni 1874-1949 inventor of the kallitron power oscillator.
"
Symmetrical oscillator
While testing VHF radio links, René Mesny encountered a lack of frequency stability in the transmitters he used. In 1924, he designed and developed an oscillator circuit with two triodes mounted in a symmetrical push-pull device.
"
#
A kallitron power oscillator/transmitter that made history as AC4YN, providing the first amateur contacts with tibet in the 1930s. derived from T urner's oscillator as then presented (reproduced in 7T. September 1988). He draws attention to a form of two-valve oscillator developed by Mesny in the early 1920s from which an output of several watts at 150MHz could be obtained: no mean achievement at that time. G8FEQ writes: "In the early 1920s there was a great deal of interest in the VHF bands despite the poor performance at high frequencies of the components of the day. One of the workers in this field was Mesny. His circuit (Fig 2) shows that this is a push-pull oscillator resembling the 'pseudo-kallitron' but with the unusual feature that feed-back Is by inductive coupling (as used in the traditional regenerative detector)" Neither G8FEQ nor I can trace anything further on the work of Mesny. but it is worth pointing out that both the Franklin and Ross Gunn oscillators of the 1920s (both included in Theory and Design of Valve Oscillators by Dr H A Thomas, 1939) use cross-coupled two-device configurations basically akin to the G40TC form of kallitron oscillator, although in the case of the Franklin the tank circuit is connected to earth rather than between the anodes. A solid-state kallitron also turns up in Sprat (Issue Nr 38) built by John Beech, G8SEQ to provide a test signal source on 70MHz: GSSEQ notes that in the form shown it can be continuously tuned, frequency modulated, or scanned by applying a sawtooth waveform to the varicap diodes. It was built using copper PCB pads stuck to a groundplane of plain PCB material, 30mm square, the layout resembling the schematic.
#
https://groups.google.com/g/alt.radio.pirate/c/S26ZH3TMsJM
https://www.gareth.net.nz/hollings/Radionecks%20%E2%80%A2%20Pirate%20Radio%20Talk%20%E2%80%A2%20AAREFF%20(page1).htm
https://www.gareth.net.nz/hollings/Radionecks%20%E2%80%A2%20Pirate%20Radio%20Talk%20%E2%80%A2%20AAREFF%20(page2).htm
https://www.gareth.net.nz/hollings/Radionecks%20%E2%80%A2%20Pirate%20Radio%20Talk%20%E2%80%A2%20AAREFF%20(page3).htm
https://www.gareth.net.nz/hollings/Radionecks%20%E2%80%A2%20Pirate%20Radio%20Talk%20%E2%80%A2%20AAREFF%20(page4).htm
VERONICA FM AT WAR! please read
Kallitron oscilator by Stephen J Moss bring to us:
The improvements, the real advantages, The oscillator to tune the entire band without the need for trimmer adjustments and so that the voltage change required to deviate from 75 kHz is large enough to make the modulation sensitivity sensitive. If you only need a few mV for full deviation, the equipment will be prone to hum and noise problems.
A big improvement was the addition of another pair of varicap diodes for audio quality.
NRG FOUNDER A swing that has not been beaten to this day. NRG (veronika).
Stephen J Moss started to swing 10 years before this article was published. https://dn790002.ca.archive.org/0/items/RadCom_Magazine_1989-06/RadCom_Magazine_1989-06.pdf
For this brilliant invention he is grateful to Rene Mesni 1874-1949 inventor of the kallitron power oscillator.
"
Symmetrical oscillator
While testing VHF radio links, René Mesny encountered a lack of frequency stability in the transmitters he used. In 1924, he designed and developed an oscillator circuit with two triodes mounted in a symmetrical push-pull device.
"
#
A kallitron power oscillator/transmitter that made history as AC4YN, providing the first amateur contacts with tibet in the 1930s. derived from T urner's oscillator as then presented (reproduced in 7T. September 1988). He draws attention to a form of two-valve oscillator developed by Mesny in the early 1920s from which an output of several watts at 150MHz could be obtained: no mean achievement at that time. G8FEQ writes: "In the early 1920s there was a great deal of interest in the VHF bands despite the poor performance at high frequencies of the components of the day. One of the workers in this field was Mesny. His circuit (Fig 2) shows that this is a push-pull oscillator resembling the 'pseudo-kallitron' but with the unusual feature that feed-back Is by inductive coupling (as used in the traditional regenerative detector)" Neither G8FEQ nor I can trace anything further on the work of Mesny. but it is worth pointing out that both the Franklin and Ross Gunn oscillators of the 1920s (both included in Theory and Design of Valve Oscillators by Dr H A Thomas, 1939) use cross-coupled two-device configurations basically akin to the G40TC form of kallitron oscillator, although in the case of the Franklin the tank circuit is connected to earth rather than between the anodes. A solid-state kallitron also turns up in Sprat (Issue Nr 38) built by John Beech, G8SEQ to provide a test signal source on 70MHz: GSSEQ notes that in the form shown it can be continuously tuned, frequency modulated, or scanned by applying a sawtooth waveform to the varicap diodes. It was built using copper PCB pads stuck to a groundplane of plain PCB material, 30mm square, the layout resembling the schematic.
#
https://groups.google.com/g/alt.radio.pirate/c/S26ZH3TMsJM
https://www.gareth.net.nz/hollings/Radionecks%20%E2%80%A2%20Pirate%20Radio%20Talk%20%E2%80%A2%20AAREFF%20(page1).htm
https://www.gareth.net.nz/hollings/Radionecks%20%E2%80%A2%20Pirate%20Radio%20Talk%20%E2%80%A2%20AAREFF%20(page2).htm
https://www.gareth.net.nz/hollings/Radionecks%20%E2%80%A2%20Pirate%20Radio%20Talk%20%E2%80%A2%20AAREFF%20(page3).htm
https://www.gareth.net.nz/hollings/Radionecks%20%E2%80%A2%20Pirate%20Radio%20Talk%20%E2%80%A2%20AAREFF%20(page4).htm
VERONICA FM AT WAR! please read
Kallitron oscilator by Stephen J Moss bring to us:
The improvements, the real advantages, The oscillator to tune the entire band without the need for trimmer adjustments and so that the voltage change required to deviate from 75 kHz is large enough to make the modulation sensitivity sensitive. If you only need a few mV for full deviation, the equipment will be prone to hum and noise problems.
A big improvement was the addition of another pair of varicap diodes for audio quality.
8
Technical Corner / Re: PCS must be the best PLL rig people now
« Last post by RIGMO on December 09, 2025, 08:01:35 am »9
Technical Corner / Re: PCS must be the best PLL rig people now
« Last post by jvok on December 08, 2025, 10:33:51 pm »Veronica originally (in the 80s) had a 1W VFO kit. It was the same oscillator and PA as the later PLL but without the PLL part. I've never seen one in person but have seen photos. The PLL came along later in the 90s I think.
I looked into ordering some 300W PA and filter PCBs from PCS a few years ago but the import duty was insane. Ended up ordering from DRFS instead. Maybe not an issue if you're in an EU country (PCS are in Slovenia I think).
I looked into ordering some 300W PA and filter PCBs from PCS a few years ago but the import duty was insane. Ended up ordering from DRFS instead. Maybe not an issue if you're in an EU country (PCS are in Slovenia I think).
10
Technical Corner / Re: 12m antenna mast very practical
« Last post by jvok on December 08, 2025, 10:24:34 pm »Also £70 for the Radioworld 12m one seems steep. You can get 10m ones on ebay for £45, could tape a bit a plastic conduit to the top if you're really desperate for the extra 2m.