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Guys, I ordered that board from Tom. Thank you for all the help etc. As far as the 7300 goes, I thought all that was adjustable in the menu??? Bob W4JFA [email protected]> wrote:

Thanks Bill...but this is the same info you sent me some weeks ago. My question is: did you intend to attach a different 3rd file, rather than the bias schematic twice? Look at the attachments you

The

Robin, Here is a problem that may be similar to yours: https://www.eham.net/forum/view?id=topic,112624.0.html I had the shorted Q2 problem as well in my Centurion. 73 Bill N4LG PS: Another problem is

Many amplifiers have a watch dog circuit that avoids the amp relays from being hot switched. Many amps will delay the closing of the relays until the PTT signal is present and no RF is at the input.

I find that really hard to believe. That means that using a 7300 with ANY amplifier - even a modern tube or solid state amp - would allow the 7300 to hot-key (or hot "un-key") the amp? This would mean

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