Ron, I used your procedure and work FB.
I used a Tone Indicator App on the iPhone to help zero beat.
Also have done all my Jupiters and very happy with the result.
Thanks for having the info handy.
Fernando N2FQ/6
n2fq@sbcglobal.net
> On Nov 12, 2015, at 8:21 PM, Ron Castro <ronc@sonic.net> wrote:
>
> Jim:
>
> I can tell you for certain that it's not in the Orion product line since
> mine generally stays within +- 5 Hz from the broadcast band to 10 meters.
> In the old days when there were two separate oscillators that determined the
> frequency, tracking errors you described can occur, but unless my memory is
> getting foggy, the entire frequency routine of the Orion is determined from
> a single oscillator module. In that case, if you're off 5 Hz on 5 MHz WWV,
> you would be off 10 Hz at 10 MHz, 15 Hz at 15. On ten meters, you would be
> 30 Hz off, all in the same direction, either plus or minus. IOW a linear
> deviation.
>
> If you calibrate the radio exactly on at 15 MHz WWV, how far off is 10 MHz
> and 5 MHz WWV? Also check 2.5 MHz WWV if you can hear it, and in the day if
> propagation is good, check 20 MHz WWV. If you continue to get the same
> result, there may be something else wrong that the factory needs to look at.
>
>
> Ron Castro
> N6IE
> www.N6IE.com
>
> Member:
> ARRL
> Redwood Empire DX Assn.
> Northern California Contest Club
> Northern California DX Foundation
> Society of Broadcast Engineers
>
>
>
> -----Original Message-----
> From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of N4BE_Jim---
> via TenTec
> Sent: November 12, 2015 7:42 PM
> To: ronc@sonic.net
> Cc: N4BE_Jim@yahoo.com; Discussion of Ten-Tec Equipment
> Subject: Re: [TenTec] TT Synthesizer Accuracy (Orion 2)
>
> Hi Ron,
>
> I thought I was following your procedure but it's still off at each end of
> the HF spectrum. I know it's probably within the advertised specs but it
> just seems excessive. Below are the O2 frequency readouts and the actual
> tuned frequencies across the bands. I used a known frequency source at each
> of 9 frequencies, rather than rely on WWV at one frequency. The WWV
> reference alignment assumes that once you calibrate at one frequency, the
> synthesizer will track linearly at all other frequencies. In my case, it
> doesn't. I haven't tried a reset yet, that's tomorrow. I have listed the
> O2 readout frequencies along side the actual tuned frequency below. In this
> case, I calibrated the TCXO at 20 meter frequencies and it tracks dead on
> within that band, but error creeps in on bands above and below. I used an
> Icom IC775 aligned to WWV as a reference, in addition to an HP8640 sig gen.
>
>
> If this same synthesizer design is used in other TT radios, which I suspect,
> then this may be a problem throughout the product line. I'm hoping it is an
> operator error. Here are the numbers:
>
> O2 Freq Readout. True tuned freq. Error
> 4.000.000. 4.000.074. +74 Hz
> 7.000.000. 7.000.052. +52 Hz
> 10.090.000. 10.090.032. +32 Hz
> 14.050.000. 14.050.000. 0 Hz
> 14.300.000. 14.300.000. 0 Hz
> 18.120.000. 18.119.973. -27 Hz
> 21.100.000. 21.099.950. -50 Hz
> 25.000.000. 24.999.919. -81 Hz
> 28.100.000. 28.099.900. -100 Hz
>
> jim N4BE
>
> Sent from my iPad
>
>> On Nov 12, 2015, at 9:55 PM, Ron Castro <ronc@sonic.net> wrote:
>>
>> Jim:
>>
>> The only accurate way to calibrate is to use the main VFO and WWV,
> preferably 15 or 20 MHz. Follow the directions for tuning the master
> oscillator found on my website:
>>
>> http://n6ie.com/TXCO%20Calibration.htm
>>
>> The fan mod helps too, but it's not 100% necessary.
>>
>> Ron Castro
>> N6IE
>> www.N6IE.com
>>
>> Member:
>> ARRL
>> Redwood Empire DX Assn.
>> Northern California Contest Club
>> Northern California DX Foundation
>> Society of Broadcast Engineers
>>
>>
>> -----Original Message-----
>> From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Jim M.
> via TenTec
>> Sent: November 12, 2015 1:51 PM
>> To: tentec@contesting.com
>> Cc: Jim M.
>> Subject: [TenTec] TT Synthesizer Accuracy (Orion 2)
>>
>> I suspect this has already been hashed over in the past, but I need some
> guidance. I use the TCXO calbration procedure found on the wiki, i.e. use
> SubRx, tune to WWV, adjust TCXO for same tone on USB and LSB. But
> afterwards, the Main RX seems to be off by 30-50 Hz depending on the
> frequency/band. I also use a known calibrated signal source (an Icom TCVR)
> at various freqs to confirm. Conversely, if I modify the procedure and
> instead listen to the known signal source on the Main Rx set for say 14Mhz,
> all is well for that band but then the Sub RX is off. Then lets say I use
> the known source to set the Tcxo when receiving 28Mhz on the O2, then tune
> the O2 down to a lower band, it will be off by 30-70 Hz depending on how far
> from 28Mhz I go. Seems like the O2 synth tracking is amiss. Is this normal
> behavior? My conslusion, unless something is malfunctioning, is DON'T
> adjust the Tcxo using the Sub RX, but rather using the Main Rx with a
> calibrated source. Then maybe cali
> brate it close to the middle of the HF frequency range, like 14.4 Mhz.
>>
>> Thanks, Jim N4BE
>> _______________________________________________
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