Re: [drakelist] LF coverage?

[wb4hfn]

Craig,  I have seen both methods used.  Either method of installing the diodes will work fine, or in combination as you suggested.   Mounting the diodes to the mother board and cutting the foil trace in some minds detracts for the value of the radio.   That is a personal call you need to make.    Accessing the AUX board only required removing the digital board.  The front panel does not need to be loosened or removed.   Removing the digital board is the easy piece, its more challanging to get it back in place.

 

Wiring you own dip modules to plug in to the AUX board is fairly simple, but it would be nice to have an article with pictures available.    This brings up a need that was identified two years ago.   Not to mention any names here, but a well know, nice guy and very active Drake enthusinist promised to write such an article for us about two years ago.  As of yet he still hasn't found the time to do so.  Hopefully when he reads this response, he will smile, and just maybe we enjoy reading his article on this subject in the near future.

 

73,  Ron / WB4HFN

 

 

-------------- Original message --------------

>
> Craig Roberts <[EMAIL PROTECTED]>made an utterance to the drakelist gang
> ----------------------------------------------------------------------
> Well, I thought I had it figured out, but...
>
> Here's my question: what's the best way to enable reception of the LF
> ranges on my TR-7 given these circumstances? --
>
> I have an AUX-7 board installed with one module aboard. It's the 0 -
> 500 KHz one, selectable from AUX Program switch position 1. I'd like to
> leave this in place but add the 500 - 100 KHz and 1000 - 1500 KHz ranges
> to switch positions 2 and 3 respectively.
>
> I have enough DIP headers and diodes to make my own "modules" to plug
> into the AUX-7 board, but have no clue how to wire the the headers with
>! ; the diodes. I've seen a programming matrix, but find it baffling. I need
> a picture, 'cuz I'm a simple fellow. This also requires digging into the
> bowels of the rig to get to the AUX-7 board. Drake says this is a
> matter of removing the display board only. Others say the front panel
> must be dropped, necessitating a delicate bandswitch shaft extraction
> (which probably isn't as surgically difficult as all that). Is there a
> preferred way of getting to the AUX-7 board?
>
> A simpler way to achieve the LF coverage, it seems, would be to install
> diodes on the parent board as Drake suggested. Since I already have a
> module in position 1 for 0 - 500 KHz., I'd skip the group of diodes for
> that range (eliminating the involvement of foil # 17). My #10 foil, by
> the way, has already been severed in order to enable 1.5 - 30 MHz
> transmit (the WARC bands, in my case).
> > Does one method have any advantage over the other? The module-making
> would be more cool and "techie", but the parent board diode tacking
> method seems a lot simple and certainly less invasive. I generally favor
> less invasive measures on radios I don't know well. Tube rigs don't
> bother me, but solid-state ones with all their little delicate thingies
> are a bit intimidating to me. I suppose I need to get over it!
>
> Thanks and 73,
>
> Craig
> W3CRR
>
> >
>
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