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I have an L-4B Amp. Love it!! The bulbs on my meters are starting to get dim. Want to replace them with LED's. Just inquiring if anyone has done this and is there any tricks that I need to know to add

Hi Rick, The TP114 test point should be a good place to get the frequency. This is to prevent loading on the oscillator. All I have got to go on is the schematic which isn’t a very good copy. It’s

Yes, my pics are pre-recap. Capars are a ticking bomb. Check often for strange spurs. "VE7PS" <ve7ps@...> wrote: -- 73 -Jim NU0C

Peter, I have downloaded the data sheets for the digital integrated circuits on the digital board and studied the ToO section of the manual until I can almost recite it verbatim. As I look at the

Not to worry! My memory is even shorter! Rick K8EZB

Rick: Duhhhh and you told me that! Memory is great....just really short. I'll crawl back under my rock now. Will peak out once in a while to find out how this ends though. 73 Peter VE7PS

Hi Mike. Looking quickly at the Offset Bd schematic, lines T, L, M, N should not be changing state in 140, 220 modes as these control the 5 Mhz offset for 440 Mhz. The 140, 220 and 10.7 Mhz (receiver

Peter, I have changed out all electrolytics in accordeance with a capacitor parts list provided by Jim. No Capar, mixed brands. Well ... yes, hopefully. All new caps tested before installing? for

Here is a photo of my RV-75 which is set for a TR7. So yours seems to be ok. Some where I have some notes on the position so will have to look. 73? Bob

Rick: FWIW...I notice you have different electrolytic caps in there - i.e. not CAPAR? Do they look original, I wonder, or have they been changed? If so...hopefully all done correctly! Jim can confirm,

Clint, Havent done this yet but its next on my list. But a bit of confusion here. The RV75 manual Section 5-5.3 REFERENCE OSCILLATOR ADJUSTMENT calls for a freq of 1.280000 MHz AT tp114, while your

I'll do this but after reviewing the complete alignment procedue in the manual, I'll also step through this to see if my unit is properly aligned (without making any adjustments). If it is not close,

Could it be that there is a programming arrangement somewhere on the board that selects the offset? Maybe a resistor jumper somewhere that has been installed? 73, Clint, VE3CMQ

Hi Rick. Have you checked the reference oscillator frequency? It doesn’t take much for this to put the entire system out of wack. It’s frequency should be 5.12MHz exactly. This is on the digital

Thanks for the all info Jim, Yes, my TR7 has the fan fitted. 73, Dave

It sounds like the PLL is not locked. Check the VCO voltage. It should be between 4.5 and 7.5 Volts, stable, and move when you turn the main tuning knob. 73 -Jim NU0C "Rick K8EZB"

Thanks, Jim. Yes, lucky for me! I have done some additional troubleshooting. The good news: static power supply regulation seems to be right on on both boards: 13v, 9v, and 5v, all well within Drake

Jim Thank you for your comments. Very helpful. And than you to Dave for raising the topic. I know now the cheap options with mine. Nigel

They all have some small amount of drift. How much depends partly on how well the PTO has aged and the accuracy of the factory temperature compensation. I found that mine have been plenty stable

Lucky for you that I took good pictures of mine. :) As found, set for 7 line. 73 -Jim NU0C "Rick K8EZB" <frboswell@...> wrote: