[drakelist] transceive frequency high on T-4 (and T-4XB)
[EMAIL PROTECTED] made an utterance to the drakelist gang -- hi, Just wondering if there is a way to adjust the frequency offset between the receiver VFO and the transmitted frequency when transceiving (T-4XB in RCVR position). I noticed that my T-4XB transmits nearly 2KC higher than the dial frequency i'm listening to and my T-4 is rather high as well. Is there a way to change this so that when I listen to the transmitted signal with the receiver (ON position, not muted during xmit) the pitch is closer to 500hz instead of 1500hz? Thanks! -- 73 Jason N1SU http://n1su.com/ -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
RE: [drakelist] R4C +B Voltage
"Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- On Sat, 24 Dec 2005 12:52:52 -0600 (CST), Jim Shorney wrote: >Most modern DVMs will do that, as >long as you take care not to exceed the maximum input ratings of the >DVM. I should also mention that the maximum rating is DC + PEAK AC. Don't exceed this or you will let the magic blue smoke out of your DVM. -- Jim Shorney -->.<--Put complaints in this box jshorney (at) inebraska.com Ham Radio NU0C Lincoln, NE, USA EN10ps http://incolor.inetnebr.com/jshorney/ -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] R4C +B Voltage
"Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- On Sat, 24 Dec 2005 13:02:32 -0500 (EST), Ron Wagner wrote: >Yes I mean series. Brain was not in gear this morning. > That seems to be going around. I think it's the season. Maybe some eggnog would help? :-) 73 Jim -- Jim Shorney -->.<--Put complaints in this box jshorney (at) inebraska.com Ham Radio NU0C Lincoln, NE, USA EN10ps http://incolor.inetnebr.com/jshorney/ -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
RE: [drakelist] R4C +B Voltage
"Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- On Sat, 24 Dec 2005 10:22:43 -0800, W7RY wrote: >No. >To measure ripple you simply measure across the filter capacitor with a >DVM set to the AC position. I was going to mention that. Really. Most modern DVMs will do that, as long as you take care not to exceed the maximum input ratings of the DVM. A tru RMS DVM is best, because the ripple is not a pure sine wave, but average reading DVMs will give you an idea. >When you do measure, measure directly across the filter capacitor, you >can pick up some inaccurate measurements if you just "clip to the >chassis" far away from the cap. Agreed. Aways best to check the teeth directly at the horse's mouth 73, Jim -- TR7/RV7, TR6/RV6, T4XC/R4C, L4B, NCL2000, SB104A, R390A, GT550A/RV550A - all vintage, all the time! -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
RE: [drakelist] R4C +B Voltage
"W7RY" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- No. To measure ripple you simply measure across the filter capacitor with a DVM set to the AC position. It should be millivolts (with a properly working filter capacitor). You can do this with any circuit. (There are special precautions if you're measuring high voltage). It's interesting to measure across the filter of an Astron power supply under full load. There is sometimes over .5 volts of AC ripple under heavy load. But there is no detectable or measurable hum on the output of the supply. The pass transistors act like a super filter. Same with a 3 terminal regulator. It is commonly used as a super filter in many applications. Very low noise and very stable. When you do measure, measure directly across the filter capacitor, you can pick up some inaccurate measurements if you just "clip to the chassis" far away from the cap. 73 Jim W7RY -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jim Shorney Sent: Saturday, December 24, 2005 8:07 AM To: [EMAIL PROTECTED]; Ron Wagner Cc: drakelist@www.zerobeat.net Subject: Re: [drakelist] R4C +B Voltage "Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- On Sat, 24 Dec 2005 07:09:05 -0500 (EST), Ron Wagner wrote: >you can use a 10uf or so capacitor rated for 200 volts in parallel with a >DVM (or analog volt meter) on the AC scale. That will basically give you >the AC ripple voltage on your DC line. Don't you mean in series with the DVM? -- TR7/RV7, TR6/RV6, T4XC/R4C, L4B, NCL2000, SB104A, R390A, GT550A/RV550A - all vintage, all the time! -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net -- -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] R4C +B Voltage
Ron Wagner <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Yes I mean series. Brain was not in gear this morning. On Sat, 24 Dec 2005, Jim Shorney wrote: "Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- On Sat, 24 Dec 2005 07:09:05 -0500 (EST), Ron Wagner wrote: you can use a 10uf or so capacitor rated for 200 volts in parallel with a DVM (or analog volt meter) on the AC scale. That will basically give you the AC ripple voltage on your DC line. Don't you mean in series with the DVM? -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
[drakelist] L7 power supply upgrade boards--status
Boys and girls.. It's Christmas eve day and the year is just about kaput. I plan on doing a few more updates to the artwork on the L4/L7 power supply upgrade pcb this week. so, here's the plan 1. if you have ordered a pcb with me, you credit card WILL Be charged in the coming week. The total will be $25+$4 shipping. 2. Provided the pcb house is not shut down for the christmas holiday and new years, the pcbs will be here within a three week period. 3. I will send an invoice out before the pcbs are shipped. that way, when you get your card statement, you won't have to figure out what your charged from "sunlight energy systems" 4. right now, if there is enough interest in a "complete" kit consisting of pcb, caps, resistors, diodes and what nots, let me know. the complete kit will be $100 +$8 shipping if nothing else, have great Christmas... mike, wb8vge Mike, WB8VGE SunLight Energy Systems The Heathkit Shop http://www.seslogic.com http://www.theheathkitshop.com/
RE: [drakelist] R4C +B Voltage
"Gerry" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- First, what is the AC line voltage? Right now, I'm seeing 117 volts as I look at my line voltage monitor. What is the typical line voltage in JA land? According to the R-4C manual, the measured voltages indicated on the schematic were measured with 120 volts AC line voltage. Other things that might affect B+ voltage are C163. Just like human beings, electrolytics have a limited life span but this is the last thing I would check. Besides the AC line voltage, be sure to measure the value of R114, a 150 Ohm 2 watt carbon composition resistor. Those can change drastically in value, particularly when stored for long periods in a hot and humid environment. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Saturday, December 24, 2005 2:22 AM To: drakelist@www.zerobeat.net Subject: [drakelist] R4C +B Voltage [EMAIL PROTECTED] made an utterance to the drakelist gang -- Hello My R4C has developed a problem. The +B voltage that should be originally +150V is only +130V. The capacity of the electrolytic capacitor C163 decreases?? May I have any suggestions about this cause? 73 de JA2JVC Ishii -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net -- -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] R4C +B Voltage
"Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- On Sat, 24 Dec 2005 07:09:05 -0500 (EST), Ron Wagner wrote: >you can use a 10uf or so capacitor rated for 200 volts in parallel with a >DVM (or analog volt meter) on the AC scale. That will basically give you >the AC ripple voltage on your DC line. Don't you mean in series with the DVM? -- TR7/RV7, TR6/RV6, T4XC/R4C, L4B, NCL2000, SB104A, R390A, GT550A/RV550A - all vintage, all the time! -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] R4C +B voltage
[EMAIL PROTECTED] made an utterance to the drakelist gang -- Thank you. I got a lot of suggestions a lot. I am sorry, those suggestions have not been tested yet. How many volts is the AC output voltage of transformer? There are - 72V at c162. The voltage of the heaters are also correct. Therefore, I think that the transformer is normal. >of the low voltage, including AC output of transformer to begin with, and >following rectifier diodes. Ishii, JA2JVC -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] R4C +B Voltage
Ron Wagner <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Ishii, I see others tell you to parallel a cap across C163 for a test. I see using a scope etc too. If you are like me, somewhat test equipment poor, you can use a 10uf or so capacitor rated for 200 volts in parallel with a DVM (or analog volt meter) on the AC scale. That will basically give you the AC ripple voltage on your DC line. High ripple suggest bad capator or heavy over loading. I choose a voltage rating for my DVM capacitro that is higher then the voltage DC that I am measuring. Also observe polarity. You do not say what the problem is that the RX has. I assume bad audio hum, etc. Don't do as I have, measured the regulated side of the +B and thought it was the problem when it was not. Then again that was a T4XB and I do not think the R4B or R4C has any 0A2 tube regulator on the +B. Let us know what you find. Good luck, Ron On Sat, 24 Dec 2005 [EMAIL PROTECTED] wrote: [EMAIL PROTECTED] made an utterance to the drakelist gang -- Hello My R4C has developed a problem. The +B voltage that should be originally +150V is only +130V. The capacity of the electrolytic capacitor C163 decreases?? May I have any suggestions about this cause? 73 de JA2JVC Ishii -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net -- -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
[drakelist] R4C +B Voltage
"Peter Hoon" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Ishii, In my point 6 in last message, be sure R4C is unplugged from power mains and turned off. Peter -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
[drakelist] R4C +B voltage
"Peter Hoon" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Sorry Ishii, stayed up too late. If you have either a yes to 3), a yes to 4), or a no to 6), replace the electrolytic capacitor. If you have a no to 3), a no to 5) and a yes to 6), look for another cause of the low voltage, including AC output of transformer to begin with, and following rectifier diodes. -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
[drakelist] R4C + Voltage
"Peter Hoon" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Hello Ishii, Think first issue is to check one or more electrolytics associated with +150V supply (and maybe others as well). Try this: 1) Mount two small leads with alligator clips on a known good electrolytic capacitor (can be a larger capacity and voltage rating that the C163). 2) Attach the aligator clips in parallel with C163, taking care with polarity. Do not unsolder C163; leave it in circuit. 3) Have you now got +150V under load with R4C turned on? 4) Repeat 3) above, removing one side of C163. 5) Have you got +150 V under load with R4C turned on? 6) Observe and set up scope 3V pk-pk display with 100 khz signal from your signal generator alone, direct connection, not connected to C163. 6) Inject the 100 khz signal 3 V pk-pk from your signal generator in parallel with C163, with scope leads also in parallel. Does scope display now flatline completely? 7) If the answer is "no" to either 3), 5) or 6) above, replace the electrolytic capacitor. 8) If the answer is yes to all of 3), 5) and 6) above, but voltage is still low, look for another cause of the low voltage, including AC output of transformer to begin with, and following rectifier diode(s). Peter VE1CHS -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] R4C +B Voltage
"Greg" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Hello My R4C has developed a problem. The +B voltage that should be originally +150V is only +130V. The capacity of the electrolytic capacitor C163 decreases?? May I have any suggestions about this cause? 73 de JA2JVC Ishii Sounds like a decent guess, when the capacitance decreases you will get more AC and less DC voltage , you could measure the ripple if you have a multimeter that handles biased ac. Try adding an extra cap paralell to C163 to see if it helps. //Greg -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
