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Welp, this thread has been taken over, so I’ll post a new one. Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent from [Proton Mail](https://proton.me/mail/home) for iOS

On further inspection I found this: Those 2 pin diodes connected to a cap? It looks like some modification, how ever I see no holes in the PCB where those 2 pin diodes would go otherwise. Early

Will a R4B and a T4XC transceive?? Is there any difference in the interconnections from if I were using R4B with T4XB? Thanks and '73 Carl - W5SU Dallas TX

Is it going to need anything special to hook it up to a Drake 4 line T-4XC. Without the nine volt battery. ________________________________ Sent: Monday, February 3, 2025 9:24:55 AM To:

Interesting. Looks like that amp has an input impedance of about 1 megohm, which is set by the base biasing resistor. - Jerry, KF6VB

From the inside bottom of a Silver Eagle VE7LXX ________________________________ Sent: Monday, February 3, 2025 7:50:20 AM To: [email protected] <[email protected]> Subject: Re: [DRAKE-RADIO]

Attached is a file I have on the amplified d104 Ralph ku4pt

Hardly been using it for TX until recently, then I notice that on 10 Meter output is close to 2.5 watts.. Okay, not much.. On 15 meters the current draw is close to 31 amps to produce 100watts! Quite

Folks, I will go down to the shack this afternoon and take photos. I'll also draw, schematically, what it looks like (by hand -- I don't have any CAD by which to do this). One thing of note that I

While we are on the subject of Mics, can someone share the wiring diagram for a powered D104 with me? Bill N1WL ? ????????? CallSend SMSAdd to SkypeYou'll need Skype CreditFree via Skype

That was after I changed the mic. Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent from [Proton Mail](https://proton.me/mail/home) for iOS

This one has no foam but there’s a white cottony-looking material that is right behind the grille. It looks identical to the Astatic 1011 I have. That mic does have a powered amp, which I run pretty

This is a 7077. Made by Astatic, rather than Turner. If there are no components in series with the element, then you should be able to get a reading from pin 1 to GND. One may need to press the PTT if

It has 3 wires. I suspect that there’s a common in there. I did think that perhaps this could be a filter but the capacitors are 0.01 and 0.47, which seem like coupling caps. They’re also in

One might have to be cautious with those small feet with the embedded studs. ?In virtually all of the ones I have seen, that stud has started to protrude through the bottom of the foot with just a

For the curious or those who have missing threaded bumpers, here’s the McMaster-Carr information: https://www.mcmaster.com/products/rubber-bumpers/bumpers~/threaded-stud-bumpers~~/ Item No.: 9541K8

Unloading the D104 cartridge makes more sense as the lower transmit passband width is extended.? For transceivers with a conventional 300 Hz to 2.4 kHz transmit bandwidth, the low-end response is

Those small rubber feet with embedded 6-32 studs are, as you note, used on the AC-4 Power Supply, and elsewhere. They are called out in the mounting options shown in the TR-4 series manuals as one of

I was there yesterday when you checked in and I didn't notice that your audio sounded tiny. I did the Heil element in a D104 carcass and had to add a matching transformer to get the impedance up.

FWIW, crystal and ceramic microphone elements look like capacitors. The load impedance forms a high pass filter with the capacitance. The higher the impedance the less the bass roll off. There is also