Re: [Drakelist] TR7 Digital control PCB

[Jim Pruitt]

Willi Rass at http://www.df4nw.de/ had some replacement programmed PROM's for 
the DR7 board but I have not heard of anyone offering a replacement prom for 
the Digital control board.

Thank you.

Jim Pruitt

>>> 
From:   Jim Shorney 
To: Douglas , "drakelist@zerobeat.net" 

Date:   2/19/2009 8:33 PM
Subject:Re: [Drakelist] TR7 Digital control PCB

On Thu, 19 Feb 2009 15:39:38 -0800 (PST), Douglas wrote:

>
>Anyone know of a source of these PROMS for one of these digital control PCBs?? 
>Does the firmware exist? It programs each Amateur Band.
>Anyone know why the two versions exist? Are there more problems with one?

I suspect the PROM version was a cost-cutting measure by Drake. I know
that there is someone, can't remember who, offering a replacement for
the PROM on the DR7, but I've not seen anyone offering the PROM for the
digital control board. It shouldn't be too hard to figure out the
programming, though. Personally, anything with a PROM makes me a little
nervous, for the reasons you are experiencing. AFAIK, there is no real
advantage to the board with the PROM, and the non-PROM board is a
little easier to modify to do a PROPER all-band transmit mod.

73

-Jim


--
Ham Radio NU0C
TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, 
HyGain 3750, IBM PS/2 - all vintage, all the time!

HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ 
http://radiojim.exofire.net 
http://incolor.inetnebr.com/jshorney 
http://www.nebraskaghosts.org 



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Re: [Drakelist] TR-7 S meter issue

[David & Chris Drake]

Thanks Jim,
VERY helpful.  Looks like I'm not the only one who's had this S-meter issue. 
I'll pull the board tonight or tomorrow and do some inspection.


Anyone on the list who has a TR-7 and does his own maintenance, should print 
out a copy of this for their "Drake Book".


73's
David

- Original Message - 
From: "Jim Shorney" 

To: ; "David & Chris Drake" 
Sent: Thursday, February 19, 2009 11:30 PM
Subject: Re: [Drakelist] TR-7 S meter issue



On Thu, 19 Feb 2009 17:44:59 -0500, David & Chris Drake wrote:


Anyway, I'm gonna study up on the 2nd if-audio board and see if I can 
figure

out anything.



Here it is:

http://radiojim.exofire.net/pages/TR7_2IFA.html

I hope this is helpful to you.

73

-Jim


--
Ham Radio NU0C
TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, 
GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time!


HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/
http://radiojim.exofire.net
http://incolor.inetnebr.com/jshorney
http://www.nebraskaghosts.org







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