Re: [drakelist] TR7 Project/Pwr Supplly Transformer
"Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- On Wed, 12 Mar 2008 22:32:35 -0400, David & Chris Drake wrote: >Just a note to all regarding the broken transformer core on the power supply >board of my project TR7. At first I figured I'd need a new transformer. As long as you're around that area, you might as well re-cap that power supply board. The capacitors in the DC-DC converter can cause some strange and very undesired symptoms when they start to go bad. 73 -Jim -- Ham Radio NU0C TR7/RV7, 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/ -- Submissions:[EMAIL PROTECTED] 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] TR7 Project/Pwr Supplly Transformer
Just a note to all regarding the broken transformer core on the power supply board of my project TR7. At first I figured I'd need a new transformer. However, based on expert guidance from Ron and Bill, I was able to super glue back the two broken top pieces and then simply glued the top and bottom halves of the transformer together (my idea). I did leave the original Drake wire tie for originallity, but it no longer serves any funtion. That fixed the problem. The rig locks up on all bands just the way it should and suprisingly its on freqency with only minor adjustment. All functions seem to be working as they should on recieve. I'll be checking transmit tomorrow. I know I bumped the 10v pot in process, but seems to be ok. After checking xmit, I'll attempt full alignment and see where I end up. I did repaint the top lid, as it was a later Drake black replacement and was scratched up. I must say it looks very nice. Split rear panel, 5392, fully loaded. Thanks to all for their comments and offers of help. David Wd9cmd
Re: [drakelist] Help with 2-B Diagnosis
Darrell Bellerive <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Terry, Thanks for the message. I already have Garey's CD. It is indeed a great source of information. I can see where it will be worth it's weight in gold once the cover comes off my 2-B. 73, Darrell On Wednesday 12 March 2008 07:45, Terrell Hamilton wrote: > "Terrell Hamilton" <[EMAIL PROTECTED]> made an utterance to the drakelist > gang -- > > Darrell - Probably an unneeded suggestion, but I found Garey's CD on the 2B > to be very helpful. It's not free, but then sometimes advice (like this) > is free because it's not worth much. (grin) Here's the link for what it's > worth - hey, that's sort of funny... > > http://www.k4oah.com > > 73 > Terry > K7WLD > > -Original Message- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of Darrell Bellerive > Sent: Tuesday, March 11, 2008 11:31 AM > To: [EMAIL PROTECTED] > Subject: [drakelist] Help with 2-B Diagnosis > > > Darrell Bellerive <[EMAIL PROTECTED]> made an utterance to the drakelist gang > -- > Last night my Drake 2-B receiver displayed a new problem. > > Over a period of a few seconds the normal static and static crashes on 80 > metres was supplanted by loud static, which was maintained for several > seconds and then over a period of a few more seconds subsided. This whole > process repeated a few times. The loud static was smoother than the normal > atmospheric static and sounded more like white noise. > > This loud static or white noise had no static crashes and movement of the > preselector did not affect the level. The s-meter followed the level of > this > > noise. The RF and AF gain controls functioned normally as did all other > controls on the radio and the 2BQ. The top of the cabinet also felt much > hotter than normal particularly over the power transformer side of the > cabinet. > > Since the preselector did not affect the level of the noise, it is unlikely > the noise was coming in on the antenna and therefore was generated > internally. Looking at the schematic the preselector is on the input side > of > > the RF amp and the s-meter on the output side of the last IF amp, so the > problem could be anywhere in between. > > Any ideas? > > Another problem I have noticed is that the 'A' band receives 80 meters > exactly > like the 80 meter band does even though there is no crystal in the 'A' band > crystal jack. I suspect that the 80 meter crystal may have been jumpered to > the 'A' band crystal jack, but am curious as to why. The receiver seems to > function equally well on both bands. > > I purchased the receiver last September at a hamfest and have not opened up > the rig, so have not inspected the crystal area inside the chassis. > > Other than a bit of hum and a little distortion on AM signals detected on > the > diode detector, the radio has worked very well. > > I have been collecting parts to recap the receiver and add the 'A' band to > 160 > meter mod, test all the tubes, and do a clean up, lube, and realignment. > Also > possibly do the AF Mod de W7ZFB, and the B&B hum mod. > > Looks like I will finally have to look under the hood. > > 73, > Darrell -- Darrell Bellerive Amateur Radio Stations VA7TO and VE7CLA Grand Forks, British Columbia, Canada -- Submissions:[EMAIL PROTECTED] 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] Help with 2-B Diagnosis
"Terrell Hamilton" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Darrell - Probably an unneeded suggestion, but I found Garey's CD on the 2B to be very helpful. It's not free, but then sometimes advice (like this) is free because it's not worth much. (grin) Here's the link for what it's worth - hey, that's sort of funny... http://www.k4oah.com 73 Terry K7WLD -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Darrell Bellerive Sent: Tuesday, March 11, 2008 11:31 AM To: [EMAIL PROTECTED] Subject: [drakelist] Help with 2-B Diagnosis Darrell Bellerive <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Last night my Drake 2-B receiver displayed a new problem. Over a period of a few seconds the normal static and static crashes on 80 metres was supplanted by loud static, which was maintained for several seconds and then over a period of a few more seconds subsided. This whole process repeated a few times. The loud static was smoother than the normal atmospheric static and sounded more like white noise. This loud static or white noise had no static crashes and movement of the preselector did not affect the level. The s-meter followed the level of this noise. The RF and AF gain controls functioned normally as did all other controls on the radio and the 2BQ. The top of the cabinet also felt much hotter than normal particularly over the power transformer side of the cabinet. Since the preselector did not affect the level of the noise, it is unlikely the noise was coming in on the antenna and therefore was generated internally. Looking at the schematic the preselector is on the input side of the RF amp and the s-meter on the output side of the last IF amp, so the problem could be anywhere in between. Any ideas? Another problem I have noticed is that the 'A' band receives 80 meters exactly like the 80 meter band does even though there is no crystal in the 'A' band crystal jack. I suspect that the 80 meter crystal may have been jumpered to the 'A' band crystal jack, but am curious as to why. The receiver seems to function equally well on both bands. I purchased the receiver last September at a hamfest and have not opened up the rig, so have not inspected the crystal area inside the chassis. Other than a bit of hum and a little distortion on AM signals detected on the diode detector, the radio has worked very well. I have been collecting parts to recap the receiver and add the 'A' band to 160 meter mod, test all the tubes, and do a clean up, lube, and realignment. Also possibly do the AF Mod de W7ZFB, and the B&B hum mod. Looks like I will finally have to look under the hood. 73, Darrell -- Darrell Bellerive Amateur Radio Stations VA7TO and VE7CLA Grand Forks, British Columbia, Canada -- Submissions:[EMAIL PROTECTED] 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:[EMAIL PROTECTED] 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 --
