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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

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

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)

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/

Thanks for the tip! I will try this as soon as I can get the replacement resistors installed. I do have a nice scope. 73, Dave KD5FX

Actually T-7C reduces the noise bandwidth of the third mixer. It doesn’t change the gain. Rob, NC0B

I have one of those little testers.? Capacitor checks seem to be close to what my much older Sencore LC75 meter shows.?? The Sencore meter will check leakage at various voltages. Not able to do

Matteo, you are not crazy but you must be determined. The distortion tells me something is amiss with the AGC system -- incorrect AGC voltage or bad interstage coupling caps putting B+ on the

Received the caps and an ESR tester. So far, so good ... See attached pic.

Good morning friends of the Drake group. I have been given a faulty rx R-4B as a gift. I overhauled the power supply part which was found to be faulty. The radio now turns on receives its internal

I did not find any ‘4427’s. I’ll find the spreadsheet later as I have an appointment to make at the moment. Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent from