December 16th 05, 03:45 PMposted to rec.radio.amateur.boatanchors |
TJM wrote: I'm a fairly new owner to the Drake line.. Having a small problem with a tr4-c and was hoping someone could send me in the right direction. After TX (cw) when relay releases, the RX sounds some times muted but still there, the S-meter will rise up the scale to about 40+ and the rx freq is off a bit (like on the wrong sideband) If I re-Key, all will return to normal..this problem will happen about 50% of the time.. looks like relay is fine), but more like the mute curcuit is hanging..??? AGC? Why do you say that it looks like the relay is fine? Have you tested its contacts? Have you looked at its contacts? Just because it goes kachunk doesn't mean it is doing its job. Every symptom you have described is classic for T/R relay contact problems. The contacts on T/R relays in tube radios often get corroded, smoky and intermittent. The first trick is to rub a piece of paper soaked in 91% isopropyl alcohol between each and every pair of contacts. operate the relay manually so that the contacts close on the paper strip. Keep doing this with fresh paper until the paper comes out clean. If the paper tears, the contact is pitted, and will need to be burnished. Burnishing is done with a piece of hardened sheet steel that has been ground on a course grinding wheel to make scratches that are like a fine file. You use it like a fine file. Do not ever use emery paper, or sandpaper of any kind, on the contacts of a relay. Don't use a file either. -Chuck |
Drake Tr4c Ssb
You can download the manual for a Drake TR-4 transceiver from here. Be aware that the file is about 15mb, very large, so will take a long time to download, depending. Describe your experience with the Drake TR 4 and other radios in this line and tell us why you give it the rating you did (required). Other useful information would include your experience with similar products, infomation on a product that you would purchase instead of this one, and so on. Add Review ×. EB5AGV's TR-4C repair notes Keep them glowing! The TR-4C was very dirty internally, but cleaned up very well and chassis is in an 8.5+ condition. I got also a manual copy (in spanish) and some spare tubes, INCLUDING a final set. The front panel is about an 8, with a couple of small scratches. Go back to Drake 4-line Page.
Máximo Martín QTH Locator IN53ui EA1DDO@HoTMaiL.com |
Drake Tr4c Manual Download
Tech Area |
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| Replacing Filter Capacitors on the Drake R-4B Receiver, by W6SPC |
| Drake T-4XB Solid-State Relay Keying Tube Replacement, by WA1KKM |
| 10-meter Adaptation for Drake L7, by WB8RXI |
| Cable TR7 to R7 esquematic |
| Cable RV75 to TR7 + R7 esquematic |
| TR-7 All Band Transmit, Low Frecuency Receive Mod. |
| Amplifier Drake L4B conversion to 3CX1500 (8877), By W2CQM |
| Amplifier Drake L4B + 6 meters band, By W2CQM |
| Toshiba 2SC2879 transistor DataSheet (PDF) |
| Macom MRF421 transistor DataSheet (PDF) |
| Motorola MRF421 transistor DataSheet (PDF) |
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| R-4 and SPR-4 Crystal Eliminator |
7 Line Squematics |
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| L7 Amplifier |
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| L4B Power Supply |
| L4B RF Deck |
Downloads |
| TR-4C Manual |
| L4B Manual |
| L4B Manual en Español |
| R-4C Manual en Español - 2,48 Mb |
| R-4C Instruction Manual - 2,46 Mb |
| TR-4 Instruction Manual (Late version) - 8,3 Mb |
| TR-4C Instruction Manual - 2,6 Mb |
| T-4XC Manual en Español - 2,2 Mb |
| TR-7 Operating Manual - 735 Kb |
| TR-7 Service Manual - 6.4 Mb |
| TR-7 Manual Español |
| R-7A Operator's Manual |
| TR7A Step Up brochure |
| DDS-4 Manual by I0CG |
| DDS4 & DDS7 Manual |
| Drake TR-M SSB Radiotelephone Manual |
| DrakeMods V6 by Wayne Montague - VE3EFJ |
| Drake original 1979 brochure |
| TR7 original 1978 brochure |
| L7 & L75 advertisement |
| RV-75 Manual |
| WB0IQK Technical Information Exchange 048 |
| WB0IQK Technical Information Exchange 062 |
| NRV7 DDS VFO by WB2UJS |
| NR-PAN7 by WB2UJS |
| N4YG DDS VFO for TR-7 |
Manuales en español, por Raúl Peris - LU9DJS |
| TR-7 Manual Español Mejorado |
| MN-7 Manual Español Mejorado |
| SP-75 Manual Español Mejorado |
| WH-7 Manual Español Mejorado |
| 7077 Manual Español Mejorado |
| AUX-7 Manual Español Mejorado |
| RV-7 Manual Español Mejorado |
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| 34-PNB Noise Blanker Manual Español Mejorado |
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| TR7 Renewed |
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| TR7 New Up Converter |
World´s largest Links Drake list |
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| R.L.DRAKE |
| DDS Digital VFO for TR4 & TR7 (AD9951) by I0CG |
| DDS-7 De Luxe, Digital Tuning System |
| K8AC IQPro VFO for TR7 |
| DigiVFO for TR-7 by Dover Research (W0VNE). |
| RB 7500 DDS VFO - Misty Hollow Enterprises |
| VFO 1000 - N3ZI / Electronic Specialty Products LLC |
| NVR7 VFO - WB2UJS (E-Bay) |
| The Radio Lab Works |
| IZ0FIB TR7 Documents Page |
| AD4C Drake's Document Page |
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| Harbach - W8CQ L4/B & L7 Parts |
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| dr-boesch radio pages |
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| TR7/A at E-Ham Review |
| Users List |
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Drake Tr4c Manual Download Free
Drake Nets | |
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