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Both the references sited, are not even close to? the MN-2000. IF u look at the schematic for the MN-2000, it consist of a PI network, followed by a series variable cap in the output leg to the ant.

Hi Gary, The T-4X was on the center hump in transceive mode. The R-4 was on the passenger side mounted under the glove compartment. The DC-4 had an output to run the receiver by simply plugging it in.

No, I have not done the mod. I would point out though that while looking at the internals the plates may look similar, the 6146 has about twice the plate dissipation of the 6JB6.? The 6146 is about

The two tubes are quite different. The 6146x was designed as an RF power amplifier tube for high duty cycle transmitter service up to 60 MHz, with operational specs described up to 175 Mhz, in various

Wait a minute.. Rob, you got a Drake 4 line in a 67 Cougar??? WOW..? Did you stack it in the passenger seat or what? Back then ignition noise was the problem.? I remember buying new resistor type

Mine goes all the way to 60, thought it doesn't "peg". -- 72/73 de Steve K9NUD .. https://youtube.com/@learnhamradio

For the group, I *think I understand now. The MN-2000 band switch varies course-grained *inductive reactance by shorting the inductor. The two capacitors give you : 1. Capacitive reactance 2.

I would "second" Gary's opinion..... I bought my C-Line in 1975 and only replaced the 2 6JB6's about a year or so ago......and it's only because I killed them. With that kind of performance from

There is some good information and references about tuners and more, here: https://www.w4npn.net/antenna-tuners/ wrote:

Thanks Ralph, the document you sent does look similar. I appreciate that and will study it. I do have the instructions for the MN-2000 and have used it many times. I feel like a capable “operator”

Thanks guys, I was able to achieve -1.35vdc off TO2 from adjusting R87 zero adjusted meter to S1 R40 adjustment while calibrator running ran out of range with a max meter deflection of only 2db over 9

You may want to look at thie? http://www.arrl.org/files/file/Technology/tis/info/pdf/7007024.pdf Seems to be the same design without the balun coil. It is not the conventional L or PI? type of

Hello, I decided recently that I really want to understand antenna tuners better. I opened my MN-2000 and was so impressed my the build quality. I see the two large air variable capacitors and I

Dave, See msg #70253 right above yours in the thread.?? No, haven't done it. 73, Gary WB6OGD

Gary, Okay, I was just curious if either of you guys had done the mod it doesn't look too hard to install and set up. In regards to performance, the 6146 mod seems to be just about on par with the

It shouldn’t really peg to the right but stop at the end of scale (60 over?). I don’t know about the 2C but the 4 line has an adjustment for that. 73, Gary WB6OGD

Yes, -1.35V is the zero signal point for all 4 Line receivers. The AGC in all of the R-4(any) is very high-impedance. Many of the biasing resistors are 5M and higher. 73, Steve Wedge, W1ES/4 Time

Steve: That is correct...On these receivers, when you switch to standby, the S-meter will move all the way over to the right, with or without the shorting plug... 73's de Charles, KW6G (formerly -

Hi KG2RG, Welcome to the Drake world! The R-4 manual I have (I have never worked on an R-4, only R-4A and R-4B) says the R87 adjustment is -1.35V, same as the later R-4's. Hopefully the manual is

First of all, thanks to my friend Paul who is helping me from 1000 miles away. after rebuilding a Heathkit DX-60A and matching VFO, I bought a Drake R-4 to pair up with the Heathkit. So far I have