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in an unbalanced system, the feedline, the shack window, the rig, etc, is part of the antenna.

how about a group design effort? Al, just list the inter-element spacings for the ant you are considering, and the part of 10m you intend to use. I have a yagi design program called ym311, I am sure there are many others. perhaps I or someone else will make suggestions for element...

is there someone here that can help me understand the difference between the dsb and ssb noise figures, and more importantly, in a typical situation, which applies. the typical story is that NF is usually about 0.5 db worse than conversion loss. ( hard to put into writing here)...

I have been away from the electronics industry for a long time. A quick internet-search look at commercial FM transmitters shows, power output up to 1KW or so. or I missed some. what's going on at higher powers? what happens to pulled tubes? 3-500 4-400 4-1000 (glass, remember...

for radios that seem to offer general coverage receive. most would appear to have no pre-selector. how do they handle image rejection?

low orbit repeaters are kinda stupid. I have seen numerous, visible at dusk satellites. (never by ham radio, btw) they move fast, visible a few minutes. now put 2 people in 2 different locations. no thanks, OK for a 6th grade science fair project, I guess

drag...thanks for your comments ok, its a low serno, 9 thousand. where is this supposed lithium battery? all I can do is remove the back plate. looking from the back, there is a 'flex' circuit-connector-thing on the left. so there is another circuit card? yuc. help. all comments...

applied 12vdc to an old Icom ic-02at, that was disused for many years. makes static noise, and display flashes '60'. squelch does not quiet. no other response was noticed. is there some secret code, to wake it up?, or its junk?

UR4LL, or anyone else. certain tubes, the maximum CW anode voltage on the spec sheet seems ridiculously low. GU-84b, GU-74b, GS-23b ... gu-84b GU-84b, ... max cw, 2.2 kv ..... really? for a tube with a 2500W anode dissipation? 73.

does anybody know the driving point impedance of a 5/8 over a ground plane? I assume the Z is something like (series equivalent) 50 ohm in series with a capacitance, but who knows. is there anything magical about 5 divided by 8?

the TYT has PL tones, or not?

what band(s)? what mode(s) grid driven or grounded grid? how much input power is available? any other issues? mobile, marine, airborne, etc ??

Shayne. in most places, you need to be a ham in your own country, before you try to get a license in some other country. even then, visiting hams are disliked by most countries because they think you are ...---> smuggling, or some other crime, or.. trying to avoid paying $$$ to the...

OK, after some research, my new question is ... what is the effective noise temperature of an antenna for 440 mhz? half of the antenna pattern looks at the earth, which is effectively a black body radiator at 290K.and half of the pattern looks at the sky, which is much RF colder. or...

for 440 Mhz FM, suppose you had 5 db of feedline loss, with a preamp, --> noise figure of 7 or 8 db.. in a real situation, is that good enough or not? what would be equivalent sensitivity? 73

Cpt. KW at minimum, I would like it to have RX pre-amp for 440-450, plus a 'thru' for Tx 50w or so for 2M/440. the switching for 440 would need to be automatically switched. 2M pre-amp would be nice. Rx pre-selection filtering for HAM FM bands only, would be nice, but that is...

OK, same question, pre-amp only, with easy hookup for both receive and transmit. the usual internet searches were not useful, only found receive-only pre-amps

coax run would be, approaching 100 feet. what I would eventually like to have, is hardline for, HF, and VHF horiz polarized, switched at the top and, completely separate, 2M and 440, FM vert polarized omni antenna. options for the latter would be... tower mounted booster, no such...

does anyone make a combo pre-amp and TX booster for tower mount. the cost of the booster could be offset by using cheap-small coax. extra credit if the coax is used for the DC

I have been away from the mic for a long time. The last time I used split, it was on a Drake R4-B, T4 ............... with rigs from the modern era (TS-930 and newer) is it possible to go from. rx.vfo A,,,,,tx.vfoA to rx,vfoA,,,,,tx.vfoB and at the same time move the vfo.B to a...