- 1. [TenTec] TT 1220 problem (score: 1)
- Author: "Brian Haren" <bharen@bellsouth.net>
- Date: Tue, 11 Nov 2003 23:08:42 -0500
- Hello All! I have a 1220 2-meter kit that has an 'issue' I hope someone can help me with... The kit was built by a local ham with a lot of kit-building experience and was recently received back from
- /archives//html/TenTec/2003-11/msg00283.html (7,635 bytes)
- 2. Re: [TenTec] TT 1220 problem (score: 1)
- Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
- Date: Tue, 11 Nov 2003 22:58:04 -0600
- Sounds to me as if its a PLL loop filter problem. Check those capacitors and resistors between the phase detector, the op amp if any, and the VCO. Check board grounding also, e.g. tightness of board
- /archives//html/TenTec/2003-11/msg00284.html (7,532 bytes)
- 3. Re: [TenTec] TT 1220 problem (score: 1)
- Author: Bill Miner <wg6h@postoffice.pacbell.net>
- Date: Wed, 12 Nov 2003 10:55:21 -0800
- Brian, I agree with Jerry K0CQ. This is most likely a bad (open or high ESR) aluminum electrolytic capacitor. The type of noise you describe could be from the Microcontroller or the BA618 display dri
- /archives//html/TenTec/2003-11/msg00285.html (9,422 bytes)
- 4. Re: [TenTec] TT 1220 problem (score: 1)
- Author: "Stuart Rohre" <rohre@arlut.utexas.edu>
- Date: Wed, 12 Nov 2003 13:25:51 -0600
- No specific experience with the whine, but a general capacitor test is to parallel temporarily a new cap of equal or nearly the same value as the electrolytics under test. If hum goes away, you may r
- /archives//html/TenTec/2003-11/msg00286.html (7,923 bytes)
- 5. Re: [TenTec] TT 1220 problem (score: 1)
- Author: Bwana Bob <wb2vuf@qsl.net>
- Date: Tue, 18 Nov 2003 20:53:05 -0500
- Brian: In addition to caps, check the final tuning and antenna SWR. My 1220 was emitting a motorboating sound when I used certain mobile antennas. The problem could be a parasitic oscillation in the
- /archives//html/TenTec/2003-11/msg00529.html (9,927 bytes)
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