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Hi everyone, thanks for your help. they say don't work on a radio tired. Well it was the PBT button pressed. Signs of life now, but the cal seems weak. On 7 mhz it is a little noisy and the S meter

MY mistake, I apologize. ? That is what I measured a few years ago before installing the soft key.

24-28vdc is what I measure on mine. ?If you want specifics out to two or three decimal places I can do that for you. 73, Evan, K9SQG

Dave, I don't have one here to measure. Research reveals zilch. So I'd just like to know open voltage at the jack and key loop current of an original L7 if anyone happens to know conclusively. Thanks,

Excellent! Yes, the 455 kHz wiring between the receiver and the multiplier was simple multiconductor cable. It may be shielded but I'd have to take the 2-BQ apart to know for sure. RG-174 is certainly

Thanks Jim for the info and I will try and get back at it tomorrow. 73, Jim VE1RB [email protected]> wrote:

The QF-1 to a Drake 2A ?adapted and working as it should. ?Maybe any 4wire cable would do. I used old heath power cable and a rg174 coax for the IF.

I believe I've measured 24-28 vdc but don't remember the current. ?Issues are voltage, current, and inductive spike. ?I've install a RadioGadgets ?UKA-1 I believe, inside the L4B and L7s that I

About 30-35VDC My IC-7610 has no problem with that as long as I use the FET switch but most SS rigs won’t do well with that. Those rigs will need an interface. Steve Wedge, W1ES Time flies like an

You can just measure it, but if it helps, YES...it is above the limit on most rigs, and will need an external relay. I went through this once myself! ....Dave

Howdy guys, I would like to know what normal open voltage and key current is at the VOX RELAY jack is on the L7. Thank-you, Jim WA9Z

Yes, you want to look at the 2nd IF/Audio board. CW operation is described towards the end of the text in section 2-11 of the service manual. In short the CW transmit carrier is generated by a crystal

Hi once again. I am back trouble shooting the TR7 with what I hope is the last problem. When I switch the mode switch to CW I get a 1800 cycle tone in the receiver that is over S9 in strength. If you

Recently had a similar issue where the PBT pots on the power supply board were non-functional; problem turned out to be internal PBT switch leakage to the lamp circuit, which was offering a low-z path

Thanks Steve, with your help I may be able to make this Drake R-4B sing again. Steve there are no problems with package delivery in Italy. Poste Italiane are working well. I regularly receive

The passband tuning voltages are steered by quad analog switch IC U1001 on the PBT/Reference board. If the control signals are reaching the IC and it is not switching as it should it has likely

Just making sure: you don’t have the PBT button pushed in, right? BTDT Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent from [Proton Mail](https://proton.me/mail/home) for

Hi everyone. Made great progress, all alignment looked fine until I got to the bandpass tuning pots on the power supply board, moving them all, nothing happened, 10v adjust ok. Took the board out,

I have one but am not sure about what would be involved with shipping. Are there still issues with sending parcels to Italy? Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana.

Interesting discussion here ... https://www.eevblog.com/forum/testgear/best-capacitor-tester/