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Sequencing is required for some rigs. The classic example is the ICOM 7300 which releases the amplifier key line before the RF goes to zero.? See QST review for IC7300.? In this case, sequencing is

I agree. You never had any kind of sequencing with the old relay. The new vacuum relays will be so much faster that you probably won't need to bother with all that. 73, Alek VK6APK.

Howdy Bob, Your second picture provided a better view... I think I figured it out. The "big" 2-pole relay appears to have a micro-switch - or some sort of auxiliary contact -? attached to it (see

pix came out fine.? There must be a 2nd relay for the bias cut off.? ?Only other method if a DPDT relay is used, is to use rf chokes on the input side of the DPDT relay, so do the cut off bias. U

Jim, OK I'll study that. Thank you. Attached is a picture of the relay on the top of the RF deck. I hope 2+ meg isn't too big of a file. Bob W4JFA [email protected]> wrote:

On the 2K-3 schematic,? RY3 is a 3PDT..... with input / output / and cutoff bias. If urs only is only a DPDT....there must be another relay in there for cut off bias.? And it only needs to be a

Thanks Jim. I'm in the research stage. Maybe I can get started September or so. Since I wrote the last email I took the top off of the RF deck. My relay up on top has two contacts, not three. Looking

Without the speed up, they will operate in 2-3 msecs.? The 3PDT clunker u have in there now will be 18-20 msecs at least. You could even leave the oem FWCT? 12 vdc supply in there.? ? Just toss

Hello Jim, I was hoping you would respond. I've read just about every amp article/post you've written the past few years. Thank you. I believe my 2K-3 OEM relay looks like this... Three contacts.

I just went through this with my 4 x Drake L4B's. I used 3 x new Gigavac GH1's.? ?You can buy em with either a 12 vdc coil or a 26.5 vdc coil.? ?Jennings version is called an RJ1A. The kilovac

Hi Bob, Good luck on your project. The relays must be sequenced so that the output relay is connected to the antenna before the amp input relay closes.? Likewise, the input relay must open before the

If I remember those meters were manufactured at a company near Cleveland. Maybe call them. I am not sure if I did or not, been a while. Mike

Too bad Ameritron/MFJ closed their doors! Thanks Mike Mod-U-Lator, Mike(y)/W3SLK Sent: Tuesday, July 30, 2024 7:07 PM To: [email protected] Subject: Re: [ham-amplifiers] AL-80 Meter I needed

I needed one years ago and called Ameritron and they fixed me up with a new one. I remember having to change a resistor inside the meter. Good luck. Mike

I'm in need of a 0~1mA meter for an original AL-80, (ala Prime) amplifier. The one that is in there now has a bad set of 'innards'. We can use the meter face from the original if I can find a same

Hi all, I'm in the beginning of planning on replacing the slow mechanical TR switches/relays in my 2K-3. Looking at the schematic it appears pretty straight forward. 12v to each relay. I have three

Hi Bob – Good hearing from you. Please reply direct at n4fs@... <mailto:n4fs@...> . Thanks & 73 – Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 908-902-3831 Sent:

Hey Mike, I just happened to see this on the reflector. Haven't heard anything about you in a long time. Last I heard was from Butch a few years ago. I do hope you are well. Probably retired by now.

Great work, Scott! Do you have a photo of the finished product before final assembly to share? [email protected]> wrote:

The End--success! The fix was a combination of (1) a 12" long resistor that could run the entire length of the tapered outer conductor, and (2) the shortest, neatest transition from the 0.875" id