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XV50 problem is worst ! Need help.

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Jean-François Ménard-5

XV50 problem is worst ! Need help.

Hi to all,

Last week, my transverter XV50 was unable to receive properly... Only
a small voice in the background... no S unit... the guy normally give
me 10 or 20 over S9... After a new alignment procedure, I was unable
to peak R13 to the desired level. I was unable to get more than 0.043
V. So my conclusion was that Q3 is dead.

I received a new Q3 transistor. Now it is installed. I did another
alignement. Now with Q3, I can peak R13 very easy to the target of
250mV. Note that before and now, my TX is still perfect. So no
trouble with TX.

But even after Q3 changed.... it is worst. I do not receive anything
at all... not even a small voice in the background.

If I listen to the background noise.... with or without antenna, it
is the same. On the receiver input aligment, my noise generator did
not make any difference ON or OFF.

So I really don't know where to start now. I don't have very much
experience in finding trouble.

If someone could coach me where to start, I will really
appreciate... :-((

Thanks for your times.

===========================

Jean-François Ménard / VA2VYZ
Elecraft K2 #4130 KX1 #999
FISTS #11896
SKCC #2245

Web: http://web.mac.com/jf.menard

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johnny-52

RE: XV50 problem is worst ! Need help.

Hi Jean,

First of all, I have to admit that I am not an expert and would suggest you
contact Gary of Elecraft.

>From what you describe, you are ok on tx. Then you should concentrate
yourself on RX route. Check all the soldering points around U1and K2 areas
first and then followed by later stages in the RX route e.g. ADEX-10H etc

If you have a good attentuator such as AT1, input a weak weak 50Mhz signal
(or noise generator) at the antenna port J1 via the RF attentuator. Use
another 50mhz receiver with a RF probe to trace the signal along the RX
path to see whether there is a break in the signal path.

Remember, use an RF attentuator in front of the antenna port

73

Johnny VR2XMC

From: Jean-Fran�ois M�nard <[hidden email]>
To: [hidden email]
Subject: [Elecraft] XV50 problem is worst ! Need help.
Date: Thu, 11 Jan 2007 20:45:14 -0500

Hi to all,

Last week, my transverter XV50 was unable to receive properly... Only a
small voice in the background... no S unit... the guy normally give me 10
or 20 over S9... After a new alignment procedure, I was unable to peak
R13 to the desired level. I was unable to get more than 0.043 V. So my
conclusion was that Q3 is dead.

I received a new Q3 transistor. Now it is installed. I did another
alignement. Now with Q3, I can peak R13 very easy to the target of 250mV.
Note that before and now, my TX is still perfect. So no trouble with TX.

But even after Q3 changed.... it is worst. I do not receive anything at
all... not even a small voice in the background.

If I listen to the background noise.... with or without antenna, it is the
same. On the receiver input aligment, my noise generator did not make any
difference ON or OFF.

So I really don't know where to start now. I don't have very much
experience in finding trouble.

If someone could coach me where to start, I will really appreciate... :-((

Thanks for your times.

===========================

Jean-Fran�ois M�nard / VA2VYZ
Elecraft K2 #4130 KX1 #999
FISTS #11896
SKCC #2245

Elecraft mailing list
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_________________________________________________________________
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Jean-François Ménard-5

Re: XV50 problem is worst ! Need help.

Could someone give me the voltage that should be read of each legs of
Q3, U1 and Z1 on RX please ?!?!?

Le 07-01-11 à 21:25, Siu Johnny a écrit :

> Hi Jean,
>
> First of all, I have to admit that I am not an expert and would
> suggest you contact Gary of Elecraft.
>
> From what you describe, you are ok on tx. Then you should
> concentrate yourself on RX route. Check all the soldering points
> around U1and K2 areas first and then followed by later stages in
> the RX route e.g. ADEX-10H etc
>
> If you have a good attentuator such as AT1, input a weak weak 50Mhz
> signal (or noise generator) at the antenna port J1 via the RF
> attentuator. Use another 50mhz receiver with a RF probe to trace
> the signal along the RX path to see whether there is a break in the
> signal path.
>
> Remember, use an RF attentuator in front of the antenna port
>
> 73
>
> Johnny VR2XMC
>
>
> From: Jean-Fran鏾is M閚ard <[hidden email]>
> To: [hidden email]
> Subject: [Elecraft] XV50 problem is worst ! Need help.
> Date: Thu, 11 Jan 2007 20:45:14 -0500
>
> Hi to all,
>
> Last week, my transverter XV50 was unable to receive properly...
> Only a small voice in the background... no S unit... the guy
> normally give me 10 or 20 over S9... After a new alignment
> procedure, I was unable to peak R13 to the desired level. I was
> unable to get more than 0.043 V. So my conclusion was that Q3 is
> dead.
>
> I received a new Q3 transistor. Now it is installed. I did another
> alignement. Now with Q3, I can peak R13 very easy to the target of
> 250mV. Note that before and now, my TX is still perfect. So no
> trouble with TX.
>
> But even after Q3 changed.... it is worst. I do not receive
> anything at all... not even a small voice in the background.
>
> If I listen to the background noise.... with or without antenna,
> it is the same. On the receiver input aligment, my noise generator
> did not make any difference ON or OFF.
>
> So I really don't know where to start now. I don't have very much
> experience in finding trouble.
>
> If someone could coach me where to start, I will really
> appreciate... :-((
>
> Thanks for your times.
>
> ===========================
>
> Jean-Fran鏾is M閚ard / VA2VYZ
> Elecraft K2 #4130 KX1 #999
> FISTS #11896
> SKCC #2245
>
>
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>
> _________________________________________________________________
> 与联机的朋友进行交流，请使用 Live Messenger; http://
> get.live.com/messenger/overview

===========================

Jean-François Ménard / VA2VYZ
Elecraft K2 #4130 KX1 #999
FISTS #11896
SKCC #2245

Web: http://web.mac.com/jf.menard

===========================

Jean-François Ménard / VA2VYZ
Elecraft K2 #4130 KX1 #999
FISTS #11896
SKCC #2245

Web: http://web.mac.com/jf.menard

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johnny-52

Re: XV50 problem is worst ! Need help.

Please refer to Appendix B- trouble shooting of the XV owners manual. 73
Johnny VR2XMC

From: Jean-Fran�ois M�nard <[hidden email]>
To: [hidden email]
Subject: Re: [Elecraft] XV50 problem is worst ! Need help.
Date: Thu, 11 Jan 2007 22:44:17 -0500

Could someone give me the voltage that should be read of each legs of Q3,
U1 and Z1 on RX please ?!?!?

Le 07-01-11 � 21:25, Siu Johnny a 茅crit :

_________________________________________________________________
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Jean-François Ménard-5

Re: XV50 problem is worst ! Need help.

In reply to this post by Jean-François Ménard-5

Hi,

I verified all voltages in the troubleshooting section... both RX and
TX.

I have a few readings that are not as the manual.

In RX, U7 (RF power module) PIN 1, I have 7.3 and should be to 0 !!!
All other pins are OK.

In TX, U5, the leg on the same side of C9 is 5V and the leg on the
side of C65 drop to 2.7V (should be around 4.7 ???)

All other measurements in the troubleshooting section are in the spec
range.

So, If I consider that my problem is in RX..... Is these results
could help ???

Le 07-01-11 à 20:45, Jean-François Ménard a écrit :

> Hi to all,
>
> Last week, my transverter XV50 was unable to receive properly...
> Only a small voice in the background... no S unit... the guy
> normally give me 10 or 20 over S9... After a new alignment
> procedure, I was unable to peak R13 to the desired level. I was
> unable to get more than 0.043 V. So my conclusion was that Q3 is dead.
>
> I received a new Q3 transistor. Now it is installed. I did another
> alignement. Now with Q3, I can peak R13 very easy to the target of
> 250mV. Note that before and now, my TX is still perfect. So no
> trouble with TX.
>
> But even after Q3 changed.... it is worst. I do not receive
> anything at all... not even a small voice in the background.
>
> If I listen to the background noise.... with or without antenna, it
> is the same. On the receiver input aligment, my noise generator did
> not make any difference ON or OFF.
>
> So I really don't know where to start now. I don't have very much
> experience in finding trouble.
>
> If someone could coach me where to start, I will really
> appreciate... :-((
>
> Thanks for your times.
>
> ===========================
>
> Jean-François Ménard / VA2VYZ
> Elecraft K2 #4130 KX1 #999
> FISTS #11896
> SKCC #2245
>
> Web: http://web.mac.com/jf.menard
>
>
>
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam? Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com

===========================

Jean-François Ménard / VA2VYZ
Elecraft K2 #4130 KX1 #999
FISTS #11896
SKCC #2245

Web: http://web.mac.com/jf.menard

__________________________________________________
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Jean-François Ménard-5

Re: XV50 problem is worst ! Need help.

Question: If I have 7.2Vdc on U7 pin 1 on RX... is it possible that a
problem with relay K1 ??? Because on RX, relay K1 should be in
another position as I can figure it out on the schematic !?!?!?!?

Le 07-01-12 à 10:05, Jean-François Ménard a écrit :

> Hi,
>
> I verified all voltages in the troubleshooting section... both RX
> and TX.
>
> I have a few readings that are not as the manual.
>
> In RX, U7 (RF power module) PIN 1, I have 7.3 and should be to
> 0 !!! All other pins are OK.
>
> In TX, U5, the leg on the same side of C9 is 5V and the leg on the
> side of C65 drop to 2.7V (should be around 4.7 ???)
>
> All other measurements in the troubleshooting section are in the
> spec range.
>
> So, If I consider that my problem is in RX..... Is these results
> could help ???
>
>
> Le 07-01-11 à 20:45, Jean-François Ménard a écrit :
>
>> Hi to all,
>>
>> Last week, my transverter XV50 was unable to receive properly...
>> Only a small voice in the background... no S unit... the guy
>> normally give me 10 or 20 over S9... After a new alignment
>> procedure, I was unable to peak R13 to the desired level. I was
>> unable to get more than 0.043 V. So my conclusion was that Q3 is
>> dead.
>>

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Jean-François Ménard-5

Re: XV50 problem... I think I'm closer to the problem

If someone could just give the actual Vdc of BOTH side of C3 (located
in RF section near U1) in RX state, it would be greatly appreciated !!!

P.S. This problem is actually giving to me an excellent lesson to
learn how the transverter work..... a problem that does not make me
mad at all... :-))

If it is an Elecraft, it could be repaired !!!

Thanks for any help !!

73

===========================

Jean-François Ménard / VA2VYZ
Elecraft K2 #4130 KX1 #999
FISTS #11896
SKCC #2245

Web: http://web.mac.com/jf.menard

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Jean-François Ménard-5

Re: XV50 problem... I think I'm closer to the problem

Worst than that.... I just connect my wideband NGen... I'm using my
rf probe too....

Now,

NGen OFF
Read at antenna jack 0.0 vrms

Ngen ON
Read at antenna jack = 0.5 vrms (ajusted my ngen to give me that result)
Read immediately at C28 on antenna jack side = 0.5 vrms also

====» Read at C28 on C1 side = 0.0 vrms !!

Am I on the good track ?!?!?!?

Further reading give me also 0 at C3 and C48

Le 07-01-12 à 17:15, Matt Osborn a écrit :

> On Fri, 12 Jan 2007 14:47:05 -0500, Jean-François Ménard
> <[hidden email]> wrote:
>
>> If someone could just give the actual Vdc of BOTH side of C3 (located
>> in RF section near U1) in RX state, it would be greatly
>> appreciated !!!
>
>
> XV50 - No antenna (no signal) using Fluke DMM:
>
> L2 side of C3 measures 4.2VDC; C48 side measures 0VDC
>
> With N-gen at antenna using RF Probe:
>
> N-Gen off:
>
> L2 side of C3 measures ~1.0mv, C48 side measures ~1.0mv
>
> N-gen on:
>
> L2 side of C3 measures ~16mv C48 side measure ~16mv.
>
> I measured the C48 side at both C3 and at C48 to see what drop there
> might be across K2 relay contacts. There was minimal difference; less
> than 0.1mv;
>
>

Jean-François Ménard-5

Re: XV50 problem... problem solved !!

First of all, thanks to everyone who help me out !!!

Problem solved !!

Finally, I changed Q3 and C28 and everything is now working A++++

Best 73

J-F VA2VYZ

Le 07-01-13 à 11:30, Jean-François Ménard a écrit :

> Worst than that.... I just connect my wideband NGen... I'm using my
> rf probe too....
>
> Now,
>
> NGen OFF
> Read at antenna jack 0.0 vrms
>
> Ngen ON
> Read at antenna jack = 0.5 vrms (ajusted my ngen to give me that
> result)
> Read immediately at C28 on antenna jack side = 0.5 vrms also
>
> ====» Read at C28 on C1 side = 0.0 vrms !!
>
> Am I on the good track ?!?!?!?
>
> Further reading give me also 0 at C3 and C48
>
>
>
> Le 07-01-12 à 17:15, Matt Osborn a écrit :
>
>> On Fri, 12 Jan 2007 14:47:05 -0500, Jean-François Ménard
>> <[hidden email]> wrote:
>>
>>> If someone could just give the actual Vdc of BOTH side of C3
>>> (located
>>> in RF section near U1) in RX state, it would be greatly
>>> appreciated !!!
>>
>>
>> XV50 - No antenna (no signal) using Fluke DMM:
>>
>> L2 side of C3 measures 4.2VDC; C48 side measures 0VDC
>>
>> With N-gen at antenna using RF Probe:
>>
>> N-Gen off:
>>
>> L2 side of C3 measures ~1.0mv, C48 side measures ~1.0mv
>>
>> N-gen on:
>>
>> L2 side of C3 measures ~16mv C48 side measure ~16mv.
>>
>> I measured the C48 side at both C3 and at C48 to see what drop there
>> might be across K2 relay contacts. There was minimal difference; less
>> than 0.1mv;
>>
>>
>
> ===========================
>
> Jean-François Ménard / VA2VYZ
> Elecraft K2 #4130 KX1 #999
> FISTS #11896
> SKCC #2245
>
> Web: http://web.mac.com/jf.menard
>
>
>
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam? Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com
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>
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> Elecraft web page: http://www.elecraft.com