RE: [drakelist] Aux 7 IC's
Hi, general coverage transmission with the TR-7 is not recommended since the transmitter low pass filters exhibit extreme mismatch on other frequencies than the standard amateur bands. Even for satisfying operation on the WARC bands I had to redesign most of the filters for proper reflection coefficient. 73 Uli, DK4SX -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Mike Elliott Sent: Sonntag, 2. Mai 2004 19:01 To: [EMAIL PROTECTED] Subject: [drakelist] Aux 7 IC's The Aux 7 can be bypassed by cutting one trace on the mother board, opening up the TR-7 for general coverage t/r. See archives for details. Mike -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ -- -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
RE: [drakelist] Aux 7 IC's
At 11:27 PM 5/2/2004, Graf Ulrich ICM MP PD ST 2 ULM 1 wrote: Hi, general coverage transmission with the TR-7 is not recommended since the transmitter low pass filters exhibit extreme mismatch on other frequencies than the standard amateur bands. Even for satisfying operation on the WARC bands I had to redesign most of the filters for proper reflection coefficient. I have a very early model TR-7 converted by Drake to the A model. Since the WARC bands have been opened in the 1980s, I've used the transceiver on 30, 17 and 12 meters which are not standard with this radio but which can be accessed quite easily. No redesign of the filters has ever been necessary. This was a point Drake Service itself made to me in July of 1987 when the conversion to A and the opening of the transceiver to WARC were made. -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
[drakelist] Filters
Thank you Stu - I designed those output filters for full coverage, and I resent the implication that they are faulty. Thanks again for your comments. Mike -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
Re: [drakelist] tr4c recieve buzz
Of 3 AC-4 power supplies I own, one has always had excessive hum. The previous owner told me he tried to replace the negative bias filter cap to no avail. After looking inside, the only difference I could find was the troublesome supply had much smaller interconnecting wires from the supply to the TR-4. Normally you would expect something around #24 but these looked like #28. One solution was to use a piece of braid from the supply case to the TR-4. There was some voltage drop between the supply and transceiver but I don't remember what it was now. Another thing you might want to look into is perhaps borrow another supply which is known to be good and compare the two. If you get similar results then you know it's the TR-4. As someone else mentioned, it could be a tube. Make sure also no-one has fooled with the AC switch wiring inside the transceiver. Checked temp replaced c 145 and it still buzzing. I think Ive effectively ruled out the radio as the source of the ac. The only thing left to change in the PS is the bias supply cap.(pair of 20uf.150v) I dont have anything close to that value small enough to fit under the chassis. Ill go looking around today. George NE2I - Original Message - From: Mark Nace To: George ; [EMAIL PROTECTED] Sent: Sunday, May 02, 2004 7:34 AM Subject: Re: [drakelist] tr4c recieve buzz Maybe there is some heater-to-cathode ac leakage in one of the tubes. A quick check of all tubes on a good tube tester might show the culprit. Also, a lead on the heater string may not be dressed properly due to previous repair, or factory QC problem. Let us all know what you find. 73, Mark N5KAE - Original Message - From: George To: [EMAIL PROTECTED] Sent: Saturday, May 01, 2004 10:00 PM Subject: [drakelist] tr4c recieve buzz Well I recapped the ac3 completely and changed all the diodes. changed c 135 (shorted) on the audio board. Changed the audio tube still buzzing away. Anything else to check? George NE2I -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
Re: [drakelist] Aux 7 IC's
It seems to me that we have two seperate questions ongoing here - - and answers : 1° emulating/programming Aux-7 board . 2° Emission out of Ham-bands or WARC ( though a consequence of 1°). For the 1st part I saw indeed on a webpage a diodes programming/soldering scheme, but I never used it as I have got a Aux-7 board waiting still to be mounted. 2° But the 2nd part from Ulrich , DK4SX, scares me. Is it so that out of former standard Ham-bands, those fixed filternetworks mismatch the PA and the 50 Ohm output? More specifically : Is there a mismatch between the pair of PA MOSFETS output impedance and the following input-impedance of those filterbanks ? If so what is an estimate of that mismatch ( SWR?). Does it eventually kill the MOSFETS.( I bought a faulty TR7 - consciously ! - which turned out to have dead PA transistors , including their drivers . I don' t why there were. Who wants this to happen again? So what Ulrich wrote might well be an issue (for us Hams on WARC) but wonder whether Drake wouldn' t have addressed this in the first place as these rigs weren't designed for Std- Ham - bands applications only but I beleive for the whole shortwave range as well? In short, what is the experience out there on WARC bands w.r.t above issue ( part 2°)? 73's Pierre. F3WT le 3/05/04 18:26, AF2C à [EMAIL PROTECTED] a écrit : It is highly unlikely that any modification and/or adjustment be made to the Low Pass filters in the the TR-7 when modified using the clad cutting method. Drake announced the use of clad cutting as an alternative to the Aux-7 boards and chips which were not going to be produced in the future. The mod came from Drake, not from an outside source. I have a late production TR7 upgraded to TR7A by Drake and it utilizes the cutting the clad. The rig has been in use with no problems relative to the modification. BTW. I have an AUX-7 Board less the chips sitting in its original box. Never used it. There are some ICOMs which have the problem Graf mentions when opened...But that's ICOM. 73, Jay/AF2C -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ -- -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
Re: [drakelist] Filters
About half of the repairs I do on Drake gear is removing somebody's modifications after which the radio works fine again... Marty - Original Message - From: Mike Elliott [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Monday, May 03, 2004 10:05 AM Subject: [drakelist] Filters Thank you Stu - I designed those output filters for full coverage, and I resent the implication that they are faulty. Thanks again for your comments. Mike -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ -- --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.674 / Virus Database: 436 - Release Date: 5/3/04 -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
Re: [drakelist] Filters
I've used TR7's for years, often on Navy Mars frequencies, and have yet to need to adjust any filters. Maybe that's why so many of them worked so well for embassy use??? 73, Don, WB5HAK - Original Message - From: Mike Elliott [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Monday, May 03, 2004 1:05 PM Subject: [drakelist] Filters Thank you Stu - I designed those output filters for full coverage, and I resent the implication that they are faulty. Thanks again for your comments. Mike -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ -- -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
[drakelist] L-7 plastic inserts...
I have one with a scratch and was trying to find a replacement. If there are replacements available I would like to know. Also if they are not would any other of the list members need a replacement? I am thinking of checking around and perhaps getting some made. This would be the insert or cover for the meters installed by removing an end cap and sliding it in the channel. Marty --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.674 / Virus Database: 436 - Release Date: 5/3/04 -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
[drakelist] Re: Aux 7 IC's
Hi all,I see in my AUX-7 instuctions sheet you can obtain all frequencies between 1.5 and 30MHz,so why would be this filters problems if Drake designed them to do this job? 73 massimo i0rwg -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
[drakelist] Filters for non-ham use
Mike, there was no implication at all. I simply wrote that since WARC bands became legal (17 and 12 meters and then 30 meters) I've been using my TR7 (TR-7A) quite happily on those bands. There's nothing to resent. I bought the rig in 1979 and while I was chasing DX I worked all there was with this transceiver and some have been on the WARC bands. I asked Drake if making the alteration to transmit outside of the ham bands (160 through 10 meters) would damage the transceiver and the answer was No. And to make things really difficult I can use my L-4B, new in 1978, on the WARC bands simply by reducing the power somewhat. I have a Drake station. It's worked everything that it's heard since 1979 and the C Line did the same before that. No implication was made that your engineering is poor or that you know nothing about what you're doing. I simply contributed the truth. Drake and the transceiver get along quite well on WARC. With kindest regards From: Mike Elliott [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Monday, May 03, 2004 1:05 PM Subject: [drakelist] Filters Thank you Stu - I designed those output filters for full coverage, and I resent the implication that they are faulty. Thanks again for your comments -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
Re: [drakelist] Aux 7 IC's
Hi Pierre: I wouldn't worry about using your TR7 on 30m, 17m, or 12m amateur bands. It will work just fine as it came from Drake. No adjustment of the low-pass filters are necessary. Unless you have reason to suspect the filters have been tampered with, I wouldn't worry. I might point out that the TR7 was repackaged for commercial and marine service and called the TR77 and TR-4310. These radios were used just about everywhere but the amateur bands. The only difference I know of between these radios and the TR7 was the PTO was replaced with a synthesizer similar (if not identical) to the RV75. Pierre, you have discovered one of the drawbacks to a free and open Internet: Anyone can post any sort of nonsense they want. You did the right thing to ask. 73, Russ WB8ZCC - Original Message - From: Pierre Rothenburger [EMAIL PROTECTED] To: AF2C [EMAIL PROTECTED]; Drakelist [EMAIL PROTECTED]; Graf Ulrich ICM MP PD ST 2 ULM 1 [EMAIL PROTECTED] Cc: Konrad Dienel [EMAIL PROTECTED] Sent: Monday, May 03, 2004 3:46 PM Subject: Re: [drakelist] Aux 7 IC's It seems to me that we have two seperate questions ongoing here - - and answers : 1° emulating/programming Aux-7 board . 2° Emission out of Ham-bands or WARC ( though a consequence of 1°). For the 1st part I saw indeed on a webpage a diodes programming/soldering scheme, but I never used it as I have got a Aux-7 board waiting still to be mounted. 2° But the 2nd part from Ulrich , DK4SX, scares me. Is it so that out of former standard Ham-bands, those fixed filternetworks mismatch the PA and the 50 Ohm output? More specifically : Is there a mismatch between the pair of PA MOSFETS output impedance and the following input-impedance of those filterbanks ? If so what is an estimate of that mismatch ( SWR?). Does it eventually kill the MOSFETS.( I bought a faulty TR7 - consciously ! - which turned out to have dead PA transistors , including their drivers . I don' t why there were. Who wants this to happen again? So what Ulrich wrote might well be an issue (for us Hams on WARC) but wonder whether Drake wouldn' t have addressed this in the first place as these rigs weren't designed for Std- Ham - bands applications only but I beleive for the whole shortwave range as well? In short, what is the experience out there on WARC bands w.r.t above issue ( part 2°)? 73's Pierre. F3WT le 3/05/04 18:26, AF2C à [EMAIL PROTECTED] a écrit : It is highly unlikely that any modification and/or adjustment be made to the Low Pass filters in the the TR-7 when modified using the clad cutting method. Drake announced the use of clad cutting as an alternative to the Aux-7 boards and chips which were not going to be produced in the future. The mod came from Drake, not from an outside source. I have a late production TR7 upgraded to TR7A by Drake and it utilizes the cutting the clad. The rig has been in use with no problems relative to the modification. BTW. I have an AUX-7 Board less the chips sitting in its original box. Never used it. There are some ICOMs which have the problem Graf mentions when opened...But that's ICOM. 73, Jay/AF2C -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ -- -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ -- -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
Re: [drakelist] Filters for non-ham use
Here here..I like the TR-7 so much I have 4 of them...HI! Thanks for making them possible Mike! 73, Gary -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
