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At what point in the production of the R4B did Drake change the tuning knob to the later C-line look? Reason I ask is mine are setup the same way. Dave

Hello Myron. ?Even as I’m packing to leave Colorado Springs, I’m interested. ?I can certainly pick up at your place. Larry, KB9VY Colo Spgs

Can you pull the tops off and take pictures of the radio insides as well? Thank you! Joe – W7RKN From: [email protected] [mailto:[email protected]] On Behalf Of Myron - KL7YY Subject:

Drake T-4XB transmitter, Sn# 15846 and R-4B Receiver, Sn# 7337, both in great condition for sale, $270 EACH, $520 for BOTH. Shipping NOT included from Colorado Springs, CO. PayPal, Venmo, Zelle, MO,

I agree that transceivers are typically -25 dBc on third order IMD. An exception are Apache transceivers with adaptive pre-distortion PureSignal. See the attached PDF right hand column that lists the

*** Also check the QRZ page of W6JL. The master of using 1N4007s etc as PIN diodes. - Jerry, KF6VB

On Sat, Mar 30, 2024 at 06:27 AM, Clyde K2UE wrote: > > <Generally speaking there are two types of tube transfer characteristics: > > <The optimum characteristic can be described as two straight

I will add here that I have seen the band oscillators fail to oscillate due to a bad chassis connection to the variable inductor. Wiggle the top part where it connects to the chassis to see if you can

For those that missed it, the full story is here under the heading 'A Common "Bad Grid Idea" Super Cathode Drive' : https://www.w8ji.com/vhf_stability.htm TLDR text below. Visit the web page to see

Also C307, C310, and C309. Especially C307 which is ceramic. I may have already replaced that one in one of my rigs. 73 -Jim NU0C "Jim Shorney via groups.io" <jimNU0C@...> wrote:

I was also thinking of a Poly cap for C314 at the input of the mic amp circuit. This might not be the best place for an electrolytic. Definitely do not use ceramic. I have heard the effects of a

Hi, Mark. It has been along time since I looked at the innards of the TR7 so I cannot speak from recent experience. In particular, look at the coupling capacitors in the TX audio chain. If there are

Drake, heath, Henry, Kenwood, etc, all did the same thing.? It was a stupid idea, right outa the gate...and doesn't work anyway.? ?IF you want say 10 db of IMD reduction, you require 11 db of

Interesting. It seems logical that a low resistance across the mic input would swamp and noise coming in at that point. But the question is where is the noise coming from? I think I would disconnect

If you are looking for those funny little screws for the 7-Line end caps check your local Ace Hardware stores. Some may have them. Every store is different and inventory varies. Item 44671-N #4 x 5/8

If you have a general coverage receiver/transceiver, listen for the crystal on 21.5 MHz.? Take a wire from the receiver antenna input over to the TR4CW and place it near the crystal area. You should

Both can still be found. https://www.rocelec.com/global-search/MPN3404 https://www.rf-microwave.com/en/unitrode/um9401/power-pin-diode/um9401/ https://www.microchipdirect.com/product/search/all/um9401

Hi Bill, Try this https://www.af4k-crystals.com/ 73, Jim VE1RB

Glenn, Thanks for the data. I will be looking out for PIN suitable for the TR-7 for my spares draw. The three 1N4007 I substituted for the RX input / TX drive steering PIN on the HPF board are working

Jim, Just put my later s/n (100xx) TR-7 on the bench, in place of the fixer-upper one, by way of a comparison. About time it saw some power! Carrier suppression on the later one is -60 dB and no trace