Re: [Drakelist] TR7 Digital control PCB
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 ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
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 ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7 Digital control PCB
I recently had a most significant digit error on my TR7. What was happening was that the readout showed 4053, when the actual frequncy should have been 14053, for example, when the bandswitch was set to 20 mtrs. Likewise it showed 11053 when it should have been 21053 on 15 mtrs. The synthesizer was off - it wasn't a readout error. The problem was in the digital control pcb. I had a spare and installing the spare solved the problem. However, I note that there are two versions of the digital control PCB. My original one has a PROM plus a digital divider circuit. The replacement one (older version?) has no PROM but does everything with counter/divider chips. From a quick logic probe check I suspect that the PROM is bad in the original PCB. The technical manual shows both versions. 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? tnx es 73, Doug/WA1TUT ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
