[TenTec] Corsair 560 alignment

[Bwana Bob]

True, you would need a sweep generator to align the bandpass circuits.  
You can check the underside of the bandpass board for cold solder joints.
Does switching the receiver preamp on and off make a difference. If not, 
I would suspect problems in the preamp, like a bad transistor.

Likewise, don't mess with the BFO/carrier oscillator frequency trimmers, 
unless you have a good frequency counter.


                             73,

                             Bob WB2VUF

On 10/4/2013 10:24 AM, Lee WA3FIY wrote:
> The Corsair (and C II) does not have the "elevator" preselector tuning.  It uses bandpass
> filters for front end selectivity.  They can be aligned but it takes the proper equipment and
> knowledge to do so.  It is also possible to ruin the frequency response curve of the filter by
> improperly tweaking the inductors.
>
> "Aligning" those would be my last resort and I do mean LAST.  I suggest checking with Ten-
> Tec service for advice.
>
> 73,
>
> -Lee-
>
>
>
> On 4 Oct 2013 at 8:17, Rick - DJ0IP / NJ0IP wrote:
>
>> Yeh, EVERYTHING.
>> There are no shortcuts, Spencer.
>>
>> The only way you can be sure that it is performing near specs is to
>> align everything., starting at the front end and working your way
>> through the radio.
>>
>> It's quite easy if you have the right equipment for it.
>>
>> Most often the cause of a poor sensitivity on those older rigs,
>> especially if it seems to different from band to band is, someone who
>> didn't know what they are doing (and didn't read the book) has
>> mis-alligned the several (all?) of the permeability tuned coils in the
>> elevator. To align that, you will need two signals, one at the bottom
>> of the band and one at the top. You only need them one at a time, so
>> it's even possible to use a QRP transceiver with an A and B vfo.
>>
>> Let me know if you need more info on this.
>>
>> 73
>> Rick, DJ0IP
>>
>>
>> -----Original Message-----
>> From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of
>> Spencer Sent: Thursday, October 03, 2013 7:00 PM To:
>> tentec at contesting.com Subject: [TenTec] Corsair 560 alignment
>>
>> I have a Corsair that was given to me. The rcvr sensitivity seems
>> blah, some sigs on 20 and 30 meters, thats it Puts out full power. I
>> plan to check things starting at the speaker working to the antenna.
>> Are there any GOTGHA's I should look out for? I will use the rig for
>> CW and maybe PSK in the future. Are there any of the narrow filters
>> available other than new?
>>
>> Spencer
>> W1GAK
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>
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