| Author |
Message |
    
Rigbuilder_1
New member
Username: Rigbuilder_1
Post Number: 3
Registered: 12-2008
| | Posted on Sunday, August 30, 2009 - 10:32 pm: | 
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are receive kits worth putting a radio. |
Unit199
Advanced Member
Username: Unit199
Post Number: 732
Registered: 8-2003
| | Posted on Monday, August 31, 2009 - 2:54 am: |
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Yes!!!!
HARVE
UNIT199
CEF0210/CVC#018/HAM#010
Midwest 10 Meter Net Controller
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Rigbuilder_1
New member
Username: Rigbuilder_1
Post Number: 4
Registered: 12-2008
| | Posted on Sunday, August 30, 2009 - 10:21 pm: |
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do receive kits really help noisy receivers. |
Bruce
Senior Member
Username: Bruce
Post Number: 5149
Registered: 9-2003
| | Posted on Monday, August 31, 2009 - 10:34 am: |
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What is a " RECEIVE " kit ? |
Tech808
Moderator
Username: Tech808
Post Number: 17096
Registered: 8-2002
| | Posted on Monday, August 31, 2009 - 10:45 am: |
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Bruce,
A Receive Kit is generally advertised to:
Boost the incoming signal up to 6db!
Greatly quietens the receive from unwanted noise.
Greatly improves noise blanker (NB) performance.
I did a GOOGLE search for: CB Receive Kit
Personally I have never found a reason to use or try one before so I have no idea if they really work or not.
Lon~Tech808
N9CEF
CEF#808~CVC#002
Radio Enthusiast!
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Patzerozero
Senior Member
Username: Patzerozero
Post Number: 4633
Registered: 7-2004
| | Posted on Monday, August 31, 2009 - 9:33 pm: |
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sixty cent transistor for 6.99 plus 5 bucks shipping.....we're in the wrong business bruce  .
yeah, Lon, if done 'right' they do seem to work. |
Flying_cloud
Member
Username: Flying_cloud
Post Number: 90
Registered: 4-2009
| | Posted on Monday, September 07, 2009 - 12:58 am: |
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I installed one in a cobra 148 gtl and got an added 4db. the total cost was $7. and it helped reduce the rec. static it works great and I was verry impressed with it!!!!!!!
Flying High and Flying Proud!!!!!!!!
CEF# 1028
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Five
Junior Member
Username: Five
Post Number: 25
Registered: 7-2009
| | Posted on Saturday, September 26, 2009 - 8:35 pm: |
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In my 2970 I put a 2sc2999e-sca in place of q-18 and put the one out of q-18 in where q-16 was. My question is couldn't I put another 2999 in the place of the one in q-16 to reduce the noise floor for ssb? I also changed d-34/45/ and d-1/d-2 to 6263 schottky diodes on AM it is really quite and on ssb it is still noisy. |
Five
Junior Member
Username: Five
Post Number: 26
Registered: 7-2009
| | Posted on Saturday, September 26, 2009 - 10:06 pm: |
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To clear up a mistake on my last post It was d-34 and d-35 not d-45.. Thanks... |
Bruce
Senior Member
Username: Bruce
Post Number: 5183
Registered: 9-2003
| | Posted on Sunday, September 27, 2009 - 6:51 am: |
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The noise floor is determined by the first stage ( Q18 )
Now even though it might not make much diffrence replacing other stages with low noise high gain devices should not hurt. |
Five
Junior Member
Username: Five
Post Number: 27
Registered: 7-2009
| | Posted on Sunday, September 27, 2009 - 4:03 pm: |
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Bruce I replaced q-18 the am first stage amplifier and it dropped the noise floor tremendously on am it sounds sweet! I believe I will leave am like it is. The transistor I took out of q-18 is a 2sc-1674 that is the one I put in q-16 the ssb first stage amplifier so you are saying it should help ssb? I have 1000 or more Of the 2sc-2999e-sca transistors so I'm not worried about wasting a few. This radio has had the tx side modded including the linear and the audio is very clear and loud done by a electronic engineer that knows what he is doing. I looked at the data sheets and I don't see why it would hurt like you had mentioned but I was making sure before I replaced the ssb side. |
Bruce
Senior Member
Username: Bruce
Post Number: 5185
Registered: 9-2003
| | Posted on Sunday, September 27, 2009 - 6:49 pm: |
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yep the first stage is what buys you the increase in gain and drop in noise what ever works feel free to go with it ... |
Five
Junior Member
Username: Five
Post Number: 29
Registered: 7-2009
| | Posted on Sunday, September 27, 2009 - 8:39 pm: |
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I went ahead and changed it and it made some difference in the ssb noise, not as much as am but any is good. Thanks... |
738
Intermediate Member
Username: 738
Post Number: 126
Registered: 7-2003
| | Posted on Sunday, September 27, 2009 - 8:07 pm: |
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Does anybody know off hand, what transistor to switch in a Magnum S980, if it would help, and what # transistor/s to change. Also I had changed the detector, and noise blanker diodes in a Galaxy 959 to NTE 583's and it made a dramatic improvement! My problem now is the copier at work is down so I can't enlarge Magnum diagram to be able to see it! (yes I'm past 40, and can't see close to well:-)).
Tnx
Robert
W7XLR |
Patzerozero
Senior Member
Username: Patzerozero
Post Number: 4675
Registered: 7-2004
| | Posted on Monday, September 28, 2009 - 10:07 pm: |
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TR017, 2SC2786ML....don't quote me on that though, my computer is kicking & not cooperating here as of late. if i remember, it is NOT a 2sc1674 in the magnums, but it is in the same spot as most other radios.....because they're all the same anyway. the S9-80 used 2 different boards, not sure which is which so check 1st.
in my S9, this mod made bleedover more conspicuous even with a channel guard added, which just changed the tone of the bleedover, making it more irratating.
did i say i'm thinking about an S9-175  |
