[R-1051] OFF FREQ

Bob Camp ham at rtty.us
Wed Apr 27 07:49:13 EDT 2011 

Hi

500 Hz doesn't sound like much for an HF radio, but for a 1051 it's a *lot*. The OCXO even when warming up should be within 500 Hz pretty fast (minutes). Drift per day after the first half hour or so should be in the "tough to measure" range (< 1Hz). The 1051 OCXO's are one item that shows up quite often at auction or at hamfests - should be easy to swap out if that's the problem. 

Bob
 
On Apr 25, 2011, at 2:04 PM, Francesco Ledda wrote:

> Normally, the warm up time is about 15 mins.
> 
> Sent from my iPhone
> 
> 
> On Apr 25, 2011, at 11:12, tgrieco at optonline.net wrote:
> 
>> Warmed up now 24 hrs and only 1 kc
>> 
>> ----- Original Message -----
>> From: Francesco Ledda 
>> Date: Monday, April 25, 2011 11:39 am
>> Subject: Re: [R-1051] OFF FREQ
>> To: R-1051 Discussion Group 
>> Cc: R-1051 Discussion Group 
>> 
>>> OK, why is it 1.5 kHz off? I would understand any multiple of 1 kHz.
>>> 
>>> Sent from my iPhone
>>> 
>>> 
>>> On Apr 25, 2011, at 10:18, tgrieco at optonline.net wrote:
>>> 
>>>> No-six pack fine. Just need to loosen slack on one chain. 
>>> Let's I am reading 14,254, I need the dial far right to read 14,253.
>>>> 
>>>> ----- Original Message -----
>>>> From: Francesco Ledda 
>>>> Date: Monday, April 25, 2011 9:10 am
>>>> Subject: Re: [R-1051] OFF FREQ
>>>> To: R-1051 Discussion Group 
>>>> Cc: R-1051 Discussion Group 
>>>> 
>>>>> 1.5 kHz off? It sounds like a bad six pack!
>>>>> 
>>>>> Sent from my iPhone
>>>>> 
>>>>> 
>>>>> On Apr 25, 2011, at 7:00, tgrieco at optonline.net wrote:
>>>>> 
>>>>>> Good morning Mike. I managed to zero beat using a steady 
>>> RTTY 
>>>>> signal yesterday. I am off by 1.5 kc. I know which dial needs 
>>> to 
>>>>> be turned, but unable to loosen up the chain enough to spin. 
>>>>> With the unit flipped up to view the bottom upright, the far 
>>>>> left chain needs to be loosened. Tried, but even a loose 
>>> idler 
>>>>> gives me no slack. If I loosen the screw in the yoke, can I 
>>>>> slide the wheel forward a bit to give me the slack I need?
>>>>>> Tim 
>>>>>> 
>>>>>> ----- Original Message -----
>>>>>> From: tgrieco at optonline.net
>>>>>> Date: Sunday, April 24, 2011 11:33 am
>>>>>> Subject: Re: [R-1051] OFF FREQ
>>>>>> To: R-1051 Discussion Group 
>>>>>> 
>>>>>>> For the moment it seems to be fine. I had to loosen the 
>>> outer 
>>>>>>> knob lock nut and take up (ccw) inside the nut so it would 
>>>>> pull 
>>>>>>> the shaft into the conical gears for a better fit. I did 
>>> tap 
>>>>> the 
>>>>>>> shaft easily with a plastic/rubber hammer to pus over a 
>>> bit. 
>>>>>>> Once the chain was adjusted it seems pretty good. 
>>>>>>> I did try WWV on 20 quickly, but band conditions not so 
>>> good 
>>>>> at 
>>>>>>> the time and will try again.
>>>>>>> Thanks
>>>>>>> Happy Easter 
>>>>>>> Tim
>>>>>>> ----- Original Message -----
>>>>>>> From: mikea 
>>>>>>> Date: Sunday, April 24, 2011 11:14 am
>>>>>>> Subject: Re: [R-1051] OFF FREQ
>>>>>>> To: R-1051 Discussion Group 
>>>>>>> 
>>>>>>>> On Sun, Apr 24, 2011 at 02:43:54PM +0000, 
>>>>>>> tgrieco at optonline.net wrote:
>>>>>>>>> Mike,
>>>>>>>>> The highlighted area is where I am stuck now. I have no 
>>>>>>> signal 
>>>>>>>> generator-any other way?
>>>>>>>>> 
>>>>>>>>> .> Getting it back in tune is relatively easy: set the 
>>>>> knobs 
>>>>>>>> up for a given
>>>>>>>>> .> freq, set a siggen to that freq and inject it into the 
>>>>>>> RX, 
>>>>>>>> loosen the idler 
>>>>>>>>> .> and turn the correct gear on the underside of the RX 
>>>>>>> until 
>>>>>>>> the siggen
>>>>>>>>> .> comes in. Once you've got everything set right, cinch 
>>>>>>> down 
>>>>>>>> that idler. 
>>>>>>>>> .> 
>>>>>>>>> .> Let us know how this comes out.
>>>>>>>> 
>>>>>>>> Yes. Set the rig to a WWV frequency (2.5, 5, 10, 15, 20 
>>>>> MHz), 
>>>>>>>> attach an
>>>>>>>> antenna that is good on that freq., and tweak the correct 
>>>>> gear 
>>>>>>>> as above. 
>>>>>>>> 10, 15, or 20 MHz probably will be your best bets, but 
>>> which 
>>>>>>>> depends on
>>>>>>>> your location and the time of day. 
>>>>>>>> 
>>>>>>>> What was the problem with the knob/shaft/gear? 
>>>>>>>> 
>>>>>>>> -- 
>>>>>>>> Mike Andrews, W5EGO
>>>>>>>> mikea at mikea.ath.cx
>>>>>>>> Tired old sysadmin 
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