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I got 4 of these valves and retrofit a Bauer 707 AM tx. They actually work pretty good, but the pair needs twice the G2 current than that of the 4-400s in the RF section. The plate modulators needed a bit more G1 negative bias to tame them for class AB1. Doesn't quite make 100% modulation, probably due to the extra G2 current requirement. Interesting valves tho. I hope to make a vid of it soon. 73!

I have 1mm stainless cable which I use for the top elements on my dipole. It seems to work well enough. I used simple screw connectors to connect it to the feeders. I coated the connections with hot melt glue to help prevent water corrosion. I have a friend who used stainless cable for his end fed wire and he seems to be happy with it. Best wishes from New Zealand. ZL3ABX.

thank you G6MMD

What is the part# of the professional calibration dongle and how do we get one? How much $$? Thanks Kindly!

Is the FP-RP meter between Tx and ATU or between ATU and feedline to antenna? If former, how much of tde 5% increase was lost in the ATU? If latter, how of the 5% increase sdows up as a 0.2 dB increase in radiated RF?

I still have my roller coaster and variable capacitor I used to use. At times I still do. L inline and C from the long wire or vertical to earth. For some lengths of wire It was better to put C at the other end of L. I used to tune for maximum r.f. out using an r.f. pickup meter at the aerial before I made my resistive SWR meter. My amateur friend was horrified! He was still horrified when I didn't calibrate the meter and just tuned for the lowest reading. After 5 years I did calibrate it. I found that most r.f. out didn't necessarily coincide with the lowest SWR. I'm only talking a fraction more out as you showed. Somebody's receiver would not notice. Nothing above 5 Watts here. G4GHB

If 4 tubes in parallel, how much watts we can take ?

I find it quite hard hard to solder, steel wire antenna.

Pee on it..i dare ya..lol😅😅😅😅

When you change the range on a vna you need to calibrate again for the best accuracy

Just stumbled on this. What an amazing QSO both in subject matter and atmospheric conditions!

Curious how a double tap on the FUNC button gets access to power level?

This is a very interesting circuit arrangement and to anyone watching this video 8 years later at 1st glance the circuit looks flawed but after doing some analysis on it, you'll understand it. So basically the circuit has the resistors in series upon intial power up, that part is easy to understand but the contacts appear to be bypassing the resistors. So you ask shouldn't the coil voltage be dwindling down until it eventually drops out???🤔 But the relay actually puts the resistors in parallel at the top and bottom of the coil allowing power to flow through the coil to keep it energized and provides full voltage to the load at least that what my analysis concluded. I have no clue what the voltage rating or current draw of this coil is either. But Great Video and Job!!! Do you experience any relay coil dropout long intervals of time??

Hello , Congratulations ! I am a beginner in mobile CB. I have just finalized my mobile CB registration with a DX27 helical antenna (1m80) + MC KINLEY+ KL-203P. So I have a beginner's question for you.👇 You must start by configuring (tuning) your antenna in "Tune" mode ('Tune' button activated) to lower the TOS/SWR, do we agree? Then, when the antenna is tuned with the MC KINLEY Tx linear amplifier, I can return to "ByPass" mode (BPS) and use (modulate to AM/FM/SSB) my CB radio? Sincerely

You sound like you could be on the radio yourself

Very few hams know the difference between a cavity duplexer and a diplexer.

you were very helpful, you took your time, talk slowly, pointed out details, really made scense..very helpful..newbe KD9ZWT

I'm in Canberra, I was taking photos of this building with a big HF dipole on the roof, a 4 wire one. I got home and looked up the building, it was a defence contrator that sells defence radios. I will not be taking any more photos there lol.

hi dgreat info say not under stand after gett i get the swr correct ...i noitice the receiver i ge ts real quite not understand that what you guys think

Wow, to miss the "Z" match. 👎🇬🇧

I think the radio sounds could be heard from there. If it's true, it will be so amazing and mind blowing.

The mfj manual says to do it the first way. Ty

There has to be a better way to power a light up there. Solar? I suppose its all obsolete tech nowadays so it does not really matter.

The MFJ manuals differ on that point. The MFJ-949E manual advises you to set the maximum capacitance and minimum capacitance possible for a good SWR. I've followed those instructions and got nice results when using my 11 meters T2LT antenna. I was able to tune and get signal out from 10 to 30 meters. Anyway, the more inductance, the more fiddly the tuning is.

Just bought one of these amps....so how are you keying it from your modern radio....and what is the wheel min/ max for

They both are reading for AVG power which is easy for a cheap meter to do , I bet if you had the BIRD PEP modification and then compared that to the REVEXs shitty capacitor PEAK mode and did some AM swing and SSB comparisons it would be COMPLETELY different..

can someone else explain the rings? like are they safety protocol for something? what do they do. all I heard was something with 220v. are they used for disconnecting power? I'm lost

Hi, Did you ever check the other traps on the analyser and record the pF capacitors required to have the antenna resonant please?

i'm quite impressed that those can be even 90% efficient (based on a quick google search) - i would have assumed that it was much lower based on the lack of a core as well as the huge amount of space between. i wonder how strong the stray magnetic field would be from this as well.

Numpty russian with plants? I know exactly which video you're talking about, lol

What does "hot" mean in this context?

I thought it was a Folded Monopole (aka Unipole) but looking closely i see the base insulator is still there along with all the guy eggs so yeah not the same but similar principle. De N7MSD

Far out. How lossy would that be?

but in the manuel, it states, it need 13,8V with tolerance 1,5%. so that means min 11,8 V and max 15,8 V. It states otherwise damede can occur

Austin ring transformer to be precise. Its just an air core transfomer with a huge air gap between primary and secondary windings.

Looks like an effective lightning arrestor of the two rings at the bottom. A good bolt and there would be a nice spark between the rings.

I wonder how driving up to the fence with a couple of large transformer coils in the back rectified leading to a battery bank would go? Surely there's some thick waves to ride there!

Austin transformer. That's a new one for me. Fascinating.

70 Kilowatts. I am jealous. I only have 2KW - BUT I use a 10.5 db gain antenna (Kt34XA upgraded to KT36XA) which becomes 22KW effectively, according to my db calculator. So I don’t feel quite so inadequate. VE6MRV

I wonder how many years it took to Realize that this was the way to do it when the radio was invented.🤔

More cool stuff I didn't need to know, like mercury rectifier tubes for the subway trains.

It looks like the precision of the Calibration load, short and open plays a significant part in the VSWR accuracy of the Mini1300. Problem is that cal kits are very very expensive. I guess with the cal kit that comes with the Mini 1300 we get what we pay for.

The Chinese guys are at their best repertoire. Mini 1300 is actually a misused version of my (EU1KY) original design of a shortwave and 2m analyzer. The mixers used in it are not intended to work above 500 MHz. Also consider that everything above 200 MHz is measured on 3rd harmonic of both the signal an LO (the measured signals are 20 db lower than normal as a result, but still yield a good result), and everything above 600 MHz is measured at 5th harmonic (at the noise floor I think).

1. It's a paint tin. 2. The instructions are on the can.

I’d like to use your demo. You have an antenna to one side of the meter. Is anything connected to the other side?

51 dB of isolation on 70 cm is more than enough for a 50 watt rig, that would represent somewhere around 397 microwatts at the input of the 2 m side. Even if you had a rig capable of 100 w on 70 cm it would still be more than enough

That was fascinating. Thanks for posting. Any idea why you measured slightly more RF power out despite a higher SWR? Seems counterintuitive. 73

Please link ?

Can this be powered via bias t?

I know that this is seven years old, but... One thing that I discovered is that an antenna tuner provides better harmonic attenuation than a TVI filter. Test it yourself and see.