[Drakelist] R4C 160 Meters Sensitivity

Hi Group Has anyone found a way to improve the sensitivity on the 160 Meter Band?? It seems less lively compared to the other bands even after alignment. Thanks in advance Bill KB9IV___ Drakelist mailing list Drakelist@zerobeat.net

[Drakelist] R4C Interesting Find

My R4C seemed a bit poor in the sensitivity department so I had an idea to improve it. I aligned the R4C pretty well but it didn't seem very lively. So with the bottom chassis visible I took my screw driver and loosened/ tightend each screw twice on each side of the 4 rows of trimmer bracket

[Drakelist] R4C SSB Leakage

Hi Group I have written previously about my R4C having signal leakage in the SSB mode only affecting the PBT control and S-meter levels. Someone suggested that the 4NB was causing the leakage so I removed the 4NB and put some wire jumpers as I didn't have a 4NB plug, no change. However I

[Drakelist] R4C Speaker Output

Hi Group On the R4C speaker output which is 3.2 ohms. Can this audio be attached to a computer's microphone jack (typically 50K) using a resistor pad to prevent overload?? 73 Bill KB9IV___ Drakelist mailing list Drakelist@zerobeat.net

[Drakelist] Need R4C Xtals

I am stil looking to buy a few Stock R4C Xtals. Mine are way off frequency...they are: 7.0 Mhz (18.1 Mhz) 28.5 Mhz (39.6 Mhz) These are Stock R4 any Xtals so they aren't scarce. 73 Bill KB9IV___ Drakelist mailing list Drakelist@zerobeat.net

[Drakelist] R4C Static

I have noticed that when using narrow CW Filter's in my R4C that I hear low-moderate static bursts,like storm static. I have substituted each and all the 6EJ7's with new tubes.no change. I removed each and all 6EJ7 tubes and power it on with no change in the static. I remove the 6BA6 RF

[Drakelist] R4C BFO Leakage

A few weeks back I wrote about PBT levels in SSB/AM modes. It would change S-Meter levels depending on adjustment of the PBT. I ruled out the 4NB board by removing it..no change. However when I removed the bottom cover almost 6 S-Units of PB feedthrough were reduced and performance was

[Drakelist] R4C PBT Leakage

Hi Bob I think you hit it on the head. Also I'm suspect of the NB cable harness being draped above the 3rd mixer tube area. I only regret not having a low end Spectrum Analyzer to end this design anomaly and improve this situation. As suggested I need to disconnect the NB and short some NB

[Drakelist] R4C Questions

Hi Group I recently obtained a Sherwood upgraded R4C (SN 22xxx), the only Sherwood upgrade it doesn't have is the 2K Upper Lower SSB filters. It performs very well but it has one oddity. When in SSB mode and the PBT is adjusted Upper Lower end of travel it varies the S-Meter from S6 middle

[Drakelist] R4C Xtals

Hi Group I am looking to replace out of spec xtals in my Drake R4C receiver. One's listed are 4-9 Khz off frequency. The * xtals are for 160M 10M are more a priority. Contact me off list @ wmarv...@charter.net Wanted: 1.5 Mhz 12.6 Mhz* 3.0 Mhz 14.1 Mhz 9.5 Mhz 20.1 Mhz 10.0 Mhz 21.1 Mhz

[Drakelist] R4C Xtals

For the most part I have found the xtals...thanks Doug! Best 4th to All Bill KB9IV___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist

[Drakelist] R4B Shorted Mini Coax

Hello Group I am near completion reworking my R4B. In the process I used the manual resistance chart to validate all was OK before powering the rig just to be safe. During check out I found a Big Problem on the V3 pin 5, it was shorted to ground ..140 VDC !! I used the divide and

[Drakelist] R4B Calibrator Buzz

Hello Group I have been working on my R4B that has Calibrator Buzz and intermitent low audio Hum. All tubes are now good and the SSB/Cw receive is very clean. I replaced the Bias Cap 8 uF no go. Any hints Best 73 Bill KB9IVV___ Drakelist mailing