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Message |
    
Audiophile73
Member
Username: Audiophile73
Post Number: 67
Registered: 5-2004
| | Posted on Monday, March 07, 2005 - 1:10 pm: | 
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i have my radio that I set to a 3 watt dead key, swings to about 12 or so. When i talk it stays between 4 and 6 watts. Is this ok to drive the texas star with. ALso I use this to drive a xforce 400, can I use vr1 inside the texas star to set the dead key of the texas star rather than re tuning my radio |
Audiophile73
Member
Username: Audiophile73
Post Number: 69
Registered: 5-2004
| | Posted on Tuesday, March 08, 2005 - 9:44 pm: |
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c'mon help a guy out |
Rficon
Junior Member
Username: Rficon
Post Number: 26
Registered: 2-2005
| | Posted on Wednesday, March 09, 2005 - 2:37 am: |
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I run my 500v with 3 watts in swinging to 30. This gives me 150+ dead key swinging to 450+.
I think that 3 watts is fine. What TS are we talking about? I would adjust the radio, not the amp.
I think you are local to me so give me a shout out on 15am or 38lsb. Usually I am on 15am. I will try to help you some more.
RFIcon. |
Audiophile73
Member
Username: Audiophile73
Post Number: 70
Registered: 5-2004
| | Posted on Wednesday, March 09, 2005 - 10:15 pm: |
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ok cool, its the texas star modulator by the way, but yeah i'll try to get ya on the radio |
Rficon
Junior Member
Username: Rficon
Post Number: 27
Registered: 2-2005
| | Posted on Thursday, March 10, 2005 - 2:43 am: |
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Looks like you can adjust some of them from inside the amp. http://www.texasstar.com/export/specifications.html
It says you can run 4 watts swinging to 20 into the modulator, but I find a little less works better. I think 3 would be good.
What radio are you using? It might be able to swing a little more.
Talk to ya on the radio.
RFIcon |
Musket
New member
Username: Musket
Post Number: 3
Registered: 12-2004
| | Posted on Friday, March 18, 2005 - 1:35 pm: |
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Is there any way to take a texas dx-250 with wire windings in t-1 t-2 t-3 t-4 circuts and replace with just a crystal for frequency control ? and is there any way to adjust the relay for longer operation when its in ssb mode? the amp delay is real short about a 1/3 of a second , you have to talk real fast. |
Patzerozero
Advanced Member
Username: Patzerozero
Post Number: 577
Registered: 7-2004
| | Posted on Friday, March 18, 2005 - 7:13 pm: |
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cap might be bad, with SSB switch in, my old 250 will stay keyed with no modulation til i unkey it. |
Inspector
Intermediate Member
Username: Inspector
Post Number: 139
Registered: 12-2001
| | Posted on Friday, March 18, 2005 - 8:11 pm: |
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SSB delay is set by an electrolytic capacitor that is active only when the [SSB] switch is pushed-in. You can extend the delay by replacing the capacitor with one with a larger value. |
Musket
New member
Username: Musket
Post Number: 4
Registered: 12-2004
| | Posted on Saturday, March 19, 2005 - 10:28 am: |
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Thanks for the info will have the capacitor changed. Would a vfo work for freq. coverage in the amp, out board mount on case & a antenna tuner?? just an Idea,, |
Inspector
Intermediate Member
Username: Inspector
Post Number: 141
Registered: 12-2001
| | Posted on Saturday, March 19, 2005 - 7:09 pm: |
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These solid-state amps have broad-band input and output transformers covering usually 3MHz to 30MHz. If you are having problems with harmonics, you can add low-pass filters after the radio and after the amp. |
Pete378
New member
Username: Pete378
Post Number: 1
Registered: 4-2005
| | Posted on Monday, April 11, 2005 - 12:07 am: |
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Hello, I recently purchased a White Line DX400v amp used, and have not been able to find out much info. about it. Is that simillar to the Texas star 400V? I also am not sure how many watts I should be driving it with? My Gallaxy 77HML is set to key about 3.5-4 watts on low and that is where I've been running it to be safe.Thank You! |
Xmean_n_nastyx1
New member
Username: Xmean_n_nastyx1
Post Number: 2
Registered: 5-2005
| | Posted on Saturday, May 21, 2005 - 6:29 pm: |
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I have a TS DX-250 originally equiped with 2sc2290's. When i got the amp they were bbq'ed so i dropped in some srf2072's( 3 in 65 out rf parts catalogue). My question is; if I drop in the 2879's, what resistance and capacitance values would have to be changed? I assume this is a common swap from a 2290 to a 2879, but i can see when DOUBLING the output from the 455's to the 2879's could get hairy. Any input would be wonderful. Thanks for some excelent reading material ;) and 73's mean n nasty, jacksonville fl am 11 |
Couchpotatoe
New member
Username: Couchpotatoe
Post Number: 5
Registered: 6-2005
| | Posted on Monday, June 13, 2005 - 9:24 pm: |
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Xmean_n_nastyx1
THIS IS HOW I'D DO A (2)2SC2879.
BASICALLY WITH WHAT YOU HAVE I'D CHANGE THE COLLECTOR TRANSFORMER TO A 1.5" 4T WRAPPING.
4T ALSO FOR THE BASE T.F. LEAVE THE 10 OHM RESISTOR ALONE ON THE BASE. DELETE THE 39OHM RESISTOR/.1UF CAP THAT MAKES NEGATIVE FEEDBACK. NOW FOR WHAT TUNES IT...WHERE THE INPUT MEETS THE BASE T.F. WINDINGS THERE IS A 91-100PF CAP, GO UP TO 120-150PF AND WHERE THE OUTPUT MEETS THE COLLECTOR T.F. WINDINGS GO THROUGH A 1000PF CAP BUT TEE OFF TO GROUND A 100 PF CAP ON THE T.F. SIDE OF THE 1000PF. SHOULD DO ABOUT 400W WITH 60-70W DRIVE THAT IS IF YOU'RE UP TO THE CHALLENGE. BE PATIENT 73'S
COUCH SPUD
HOUSTON,TX
COUCH POTATOE'S MOBILE RADIO SVC
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