Charlie Tango 11m DX Radio Group Forum
Would you like to react to this message? Create an account in a few clicks or log in to continue.


Welcome to the Charlie Tango DX Group. The home of ALL things Radio - CB, 11m DX, Amateur, PMR446, PLD, Network and Data. We welcome all radio enthusiasts of all knowledge levels. Join today and claim your own unique World Famous CT Call-sign
 
HomeEventsCalendarFAQSearchRegisterLog in
XMAS COMPETITION: Win a Brand New Yaesu ft891 with Wideband Modification and to help the winner use it we are including a 30 Amp Power Supply on top. This is our biggest prize yet. All this could be yours for Christmas for just £20. - See Latest News Forum for details.
Latest Buxton 2020 News: Unfortunately, due to the Covid-19 pandemic we have had to cancel this year's Buxton date. Sorry for any inconvenience.
Navigation
Useful Radio Sites
Log in
Username:
Password:
Log in automatically: 
:: I forgot my password
CT Bill Board





Views This Year
All Time Views
Classified Adverts

Latest topics
Keywords
tango Calling alan 9900 charlie ss9900 antenna division ss6900n midland call Sirio power bazooka chart list tickets Mckinley Mobile lincoln president frequency radio sign Baofeng callsign
QRZ Database
 

 Zetagi B300P. A little help please.

Go down 
AuthorMessage
Dogfish
New Member
New Member
Dogfish

Call Sign : CT2379
Posts : 20
Times Thanked : 3
Join date : 2019-06-27
QTH or Location : Surrey Hills
Equipment Used : Grant 2 + Tankwhip mobile with Sirio Gainmaster 5/8ths homebased

Zetagi B300P. A little help please.  Empty
PostSubject: Zetagi B300P. A little help please.    Zetagi B300P. A little help please.  Icon_minitimeSat Nov 23, 2019 11:12 pm

I just got one of these Zetagi B300p amps.

After a couple of days use attached to my expanded Grant 2, Sirio Gainmaster 5/8 and 30A PSU the Pre Amp seems to have stopped working. It seems to attenuate the signal when turned on. The unit also smells as if it's burning.
For the moment I have disconnected it, I don't want to damage it or my homebase.

Does anyone have any experience with this brand?
I was under the impression that Zetagi products were O.K.

Getting a little desperate!
Back to top Go down
View user profile
Victor
CT Directors
CT Directors
Victor

Call Sign : 26-CT-3228 Ham M7VIC
Posts : 1010
Times Thanked : 63
Join date : 2019-11-10
QTH or Location : Bedford
Equipment Used : Various

Zetagi B300P. A little help please.  Empty
PostSubject: Re: Zetagi B300P. A little help please.    Zetagi B300P. A little help please.  Icon_minitimeSun Nov 24, 2019 7:44 am

Hi Simon,

Did you buy the Zetagi's new or second hand?

The reason for asking is, if new from a supplier then you have a recourse of action.
If second hand then you might as well have played eenie-miney with a line of hookers - you don't know who's had their dirty paws on it or what they've done to them! Wink

(Joking aside)

If you purchased new you can go back to the supplier and work with them. I know some will fob you off but most have a good reputation to keep and will do their best to help you. At best you'll get replacements, at worst they may charge you for repair, only some will stubbornly refuse to work with you.

If second hand then you obviously need some kind of service or repair.
Do you have appropriate equipment and skills to attempt a repair yourself? There's a tonne of information, (handy nowadays), on the internet with circuit diagrams etc.

Otherwise asking online for suggestions to repair is akin to closing your eyes and putting your fingers in your ears whilst stomping across a minefield.....if you're very lucky you might get across!

The usual fault with this type of equipment is people over driving them, however other faults can occur too.

To me it seems like the preamp transistor, (or transistors depending on design or version), has blown obvious by the preamp function appearing to fail. The "burning" smell would have me concerned that there's maybe something more at fault.

As for the Zetagi brand, they have manufactured and or branded equipment for years.
That's a bit like asking the "Nike/Reebok/etc." question, a personal preference if you will.
At this moment the brand doesn't seem all that good for you, but for others who have never had a problem with the brand will give it all thumbs up.


I'd say you did the best thing by simply disconnecting them and protecting your rig.

From here on in is up to you. Bin them, send them for repair, or attempt a self repair.


I feel for you, it's disheartening when a piece of equipment fails, but at least it wasn't your rig - that really sucks!


Best of luck,
Victor



_________________
Theory means that we know everything, but nothing works.
Practice means that everything works, but we don't know why.
Often, however, theory is closely related to practice.
It means nothing works and nobody knows why ...
Back to top Go down
View user profile
26TC62
Senior contributor
Senior contributor
26TC62

Call Sign : 26TC62, 26CT2817
Posts : 142
Times Thanked : 29
Join date : 2019-06-27
QTH or Location : Portsmouth
Equipment Used : Yaesu 891, 10m pole, wire 5/8, T2LT

Zetagi B300P. A little help please.  Empty
PostSubject: Re: Zetagi B300P. A little help please.    Zetagi B300P. A little help please.  Icon_minitimeSun Nov 24, 2019 8:36 am

Sounds as if the preamp side has got fried. If the TX/RX relay hasn't switched over and it's applied TX power to the preamp, that could be one cause of the problem. Assuming it's only cooked the preamp transistors (which are cheap enough) it's not a big repair for someone who knows what they are doing.
Back to top Go down
View user profile
Dogfish
New Member
New Member
Dogfish

Call Sign : CT2379
Posts : 20
Times Thanked : 3
Join date : 2019-06-27
QTH or Location : Surrey Hills
Equipment Used : Grant 2 + Tankwhip mobile with Sirio Gainmaster 5/8ths homebased

Zetagi B300P. A little help please.  Empty
PostSubject: Re: Zetagi B300P. A little help please.    Zetagi B300P. A little help please.  Icon_minitimeSun Nov 24, 2019 10:19 am

Thanks 26CT62.
Sounds interesting.
Think I'll have to take it to the shop to get diagnosed.
I hope it's not because my Grant 2 is too powerful for it. Supposedly kicks out 20w on SSB which is the advertised input wattage for that amp.
Noticed it's got a slight rattle too.
Hey ho!
Won't be hilltopping with it this week. Sad
Back to top Go down
View user profile
Dogfish
New Member
New Member
Dogfish

Call Sign : CT2379
Posts : 20
Times Thanked : 3
Join date : 2019-06-27
QTH or Location : Surrey Hills
Equipment Used : Grant 2 + Tankwhip mobile with Sirio Gainmaster 5/8ths homebased

Zetagi B300P. A little help please.  Empty
PostSubject: Re: Zetagi B300P. A little help please.    Zetagi B300P. A little help please.  Icon_minitimeSun Nov 24, 2019 10:24 am

Thanks Victor.
Some very sound advice.
I will work either the retailer every time.
I could take it apart and attempt the repair however im not great at that stuff. I can do the basics, soldering but that's it.
Back to top Go down
View user profile
Victor
CT Directors
CT Directors
Victor

Call Sign : 26-CT-3228 Ham M7VIC
Posts : 1010
Times Thanked : 63
Join date : 2019-11-10
QTH or Location : Bedford
Equipment Used : Various

Zetagi B300P. A little help please.  Empty
PostSubject: Re: Zetagi B300P. A little help please.    Zetagi B300P. A little help please.  Icon_minitimeSun Nov 24, 2019 10:49 am

No worries Simon,

Hope you get the issue solved, right downer when radio kit goes down.

Also, congrats on knowing uncertainty of self repair.....CBers and Hams can be notorious "screwdriver experts"! Wink


All the best,
Victor

_________________
Theory means that we know everything, but nothing works.
Practice means that everything works, but we don't know why.
Often, however, theory is closely related to practice.
It means nothing works and nobody knows why ...
Back to top Go down
View user profile
NUBSTER
10 + Year member
10 +  Year  member
NUBSTER

Call Sign : 26 CT050 26 FB080 26 WT105 26 TE171
Posts : 537
Times Thanked : 38
Join date : 2019-06-27
QTH or Location : NORTH LONDON
Equipment Used : original President Lincoln, Midland 8001XT, President Teddy , Silver Eagle microphones , Gainmaster antenna, use a AMP ofcourse I do sometimes
Age : 62

Zetagi B300P. A little help please.  Empty
PostSubject: Re: Zetagi B300P. A little help please.    Zetagi B300P. A little help please.  Icon_minitimeSun Nov 24, 2019 8:29 pm

First of are you100% sure you radio is putting out 20watts when you are using the amp and not more , second it actually says on the information sheet inputv1w to 20w but that doesn't mean run it at 20w constantly, it means up to 20w ,I've had one for years and I have never ran at 20w constantly I've only done that on certain accations and only a short time ,as for the preamp side TBH there crap mine sometimes don't work but TBH a preamp only brings in what it hears thats including all the interference and any other crap it does not just pick out the voice transmission.
Back to top Go down
View user profile
Dogfish
New Member
New Member
Dogfish

Call Sign : CT2379
Posts : 20
Times Thanked : 3
Join date : 2019-06-27
QTH or Location : Surrey Hills
Equipment Used : Grant 2 + Tankwhip mobile with Sirio Gainmaster 5/8ths homebased

Zetagi B300P. A little help please.  Empty
PostSubject: Re: Zetagi B300P. A little help please.    Zetagi B300P. A little help please.  Icon_minitimeSun Nov 24, 2019 8:39 pm

Nice one Nubster. I don't seem to have a power reducing switch like some rigs so I must have been banging in the full 20w.
Complete Nube mistake and it's a self inflicted injury! Oowwcchhh. I'm going to ask the shop to either turn my power down some on the rig or fit a switch or get an attenuator separately if it exists so I can run it barefoot if hilltopping.

Embarrassed by my stupidity, but lesson learned.
Cheers.
73.
Back to top Go down
View user profile
NUBSTER
10 + Year member
10 +  Year  member
NUBSTER

Call Sign : 26 CT050 26 FB080 26 WT105 26 TE171
Posts : 537
Times Thanked : 38
Join date : 2019-06-27
QTH or Location : NORTH LONDON
Equipment Used : original President Lincoln, Midland 8001XT, President Teddy , Silver Eagle microphones , Gainmaster antenna, use a AMP ofcourse I do sometimes
Age : 62

Zetagi B300P. A little help please.  Empty
PostSubject: Re: Zetagi B300P. A little help please.    Zetagi B300P. A little help please.  Icon_minitimeSat Nov 30, 2019 10:14 am

No worries Dogfish glad to help
Back to top Go down
View user profile
Dogfish
New Member
New Member
Dogfish

Call Sign : CT2379
Posts : 20
Times Thanked : 3
Join date : 2019-06-27
QTH or Location : Surrey Hills
Equipment Used : Grant 2 + Tankwhip mobile with Sirio Gainmaster 5/8ths homebased

Zetagi B300P. A little help please.  Empty
PostSubject: Re: Zetagi B300P. A little help please.    Zetagi B300P. A little help please.  Icon_minitimeSat Nov 30, 2019 1:04 pm

Update.
Got the amp repaired, cost £35 which is more than reasonable I think and it came back with a spare transistor.
I went through my patch leads and found a dodgy one, repaired it and all fine now.
Thank you all for your help.
Back to top Go down
View user profile
Victor
CT Directors
CT Directors
Victor

Call Sign : 26-CT-3228 Ham M7VIC
Posts : 1010
Times Thanked : 63
Join date : 2019-11-10
QTH or Location : Bedford
Equipment Used : Various

Zetagi B300P. A little help please.  Empty
PostSubject: Re: Zetagi B300P. A little help please.    Zetagi B300P. A little help please.  Icon_minitimeSat Nov 30, 2019 1:55 pm

Nice one Simon Very Happy

That was an awesomely good price for a repair too.

All the best to you mate,
Victor

_________________
Theory means that we know everything, but nothing works.
Practice means that everything works, but we don't know why.
Often, however, theory is closely related to practice.
It means nothing works and nobody knows why ...
Back to top Go down
View user profile
 
Zetagi B300P. A little help please.
Back to top 
Page 1 of 1

Permissions in this forum:You cannot reply to topics in this forum
Charlie Tango 11m DX Radio Group Forum :: Help and Discussion Forums :: Amplifiers-
Jump to: