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Re: Chinese FT-817 TCXO?
Hi Ronan, Thanks for your input and excellent suggestions, sounds like you are a member of a great club, I will see what the local clubs offer. I know that the ARRL has a frequency test night once a year, so that's an option also. Vy73, Rick VE1RNM? On Thu., Oct. 20, 2022, 5:58 a.m. Ronan Cantwell, <ronancantwell@...> wrote: On Wed, Oct 19, 2022 at 11:46 PM, VE1RNM wrote: |
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Re: Chinese FT-817 TCXO?
On Wed, Oct 19, 2022 at 11:46 PM, VE1RNM wrote:
So my question is how are you checking the frequency deviation of the Chinese tcxo-9s other than using another rig as a baseline.Fortunately, my local radio club (CPSARC) run a "radio check" night where you can bring along your radios and have them tested for frequency accuracy, output purity and Rx sensitivity. They use some VERY nice and, more importantly, calibrated test equipment.? Check if your local club do the same. |
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Re: Any reviews?
Marek Szuba
On 2022-10-20 00:50, Doc Sarvis via groups.io wrote:
Sorry for the brain fart...Oh, one of these. One important thing to keep in mind about them is that they use transistors designed for use in switching-mode power supplies rather than "true" RF ones (hardly surprising given the price tag!), so while overall this kit performs decently enough do not expect wonders as you move up in the frequency. And as Dave has already remarked, you WILL need good low-pass filtering on the output. -- Marek M0JUR |
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Re: Any reviews?
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On Oct 19, 2022, at 18:16, Doc Sarvis via groups.io <kd5ceu@...> wrote:
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Re: Any reviews?
You will have to add low pass filters for the band's you are going to use, Dave? On Thu, 20 Oct 2022, 00:51 Doc Sarvis via , <kd5ceu=[email protected]> wrote:
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Re: Chinese FT-817 TCXO?
Thanks Chris, That sounds like an excellent way to determine the deviation, I'm actually in the process of getting my raspberry Pi hooked up for wspr so once done, will pick one of the Chinese tcxo-9s and see what happens, perhaps I will get a good one also. Regards from Pictou county Nova Scotia Rick VE1RNM? On Wed., Oct. 19, 2022, 7:53 p.m. Christopher Maness, <christopher.maness@...> wrote: I am checking by transmitting WSPR beacons and see how it compares |
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Re: Chinese FT-817 TCXO?
I am checking by transmitting WSPR beacons and see how it compares
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with what signal it should be based on the audio frequencies that are modulated in the passband. It was on average only 1Hz off from the expected frequency. Many of these receivers have GPS disciplined clocks that synthesize the waveforms used in the mixers and DSP demodulators. Therefore it is easy to know with a great degree of precision what frequency you are transmitting added to the audio "carrier" of the modulated message. On Wed, Oct 19, 2022 at 3:47 PM VE1RNM <rickmoskovits@...> wrote:
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Thanks, Chris Maness |
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Re: Chinese FT-817 TCXO?
Hi Chris and greetings to the group, I've owned a ft817 early manufacture (2001)since purchase new and have been wanting to have the tcxo -9 but like many out there, can't quite handle the price....$160 plus shipping in Canada! So my question is how are you checking the frequency deviation of the Chinese tcxo-9s other than using another rig as a baseline. My ft1000mp mkv field is from 2004 so it has drifted a tiny bit so using it isn't an option. Any thoughts or suggestions would be very?much appreciated. Vy73, Rick VE1RNM? On Wed., Oct. 19, 2022, 9:56 a.m. Christopher Maness, <christopher.maness@...> wrote:
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Re: Chinese FT-817 TCXO?
Ronan,
After Having The China TCXO's? in my two FT-817's? The Needed patience to get? it few Hertz of spec is NOT With Me at this time. Since Recently I picked Up a Third FT-817 that has the "Factory" LO I will be shopping for a TCXO and will look at Amazon Firstly And Then on AliExpress. On The Other Hand The Need For " Inexpensive"? NARROW CW Filters Exists And Is Needed to Keep the FT-817-818 Viable in present time. It is my understanding that a few China Hams are working on using existing what they call "Filter Blocks" that are easily obtained to produce a kit for at least a 500 version, some thing in the $70-80 region. I Do Hope that they are Successful. ? ?Best Regards. Steve AB2ET/4 |
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Re: Chinese FT-817 TCXO?
I am the original owner, and I purchased a 500Hz for it many moons
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ago. I take it they don't make them anymore? If not, that is too bad. On Wed, Oct 19, 2022 at 6:23 AM Petr Ourednik <indians@...> wrote:
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Thanks, Chris Maness |
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Re: Chinese FT-817 TCXO?
Mine was 1Hz off, ?? On Wed, Oct 19, 2022 at 2:29 AM Ronan Cantwell <ronancantwell@...> wrote: I've had one of the cheap Chinese TCXO in my radio for a while and it's been absolutely fine. It's possible, with a bit of patience and swearing, to tweak the frequency of these to within a few Hertz of spec. Well worth the few pounds spent. --
Thanks, Chris Maness -Sent from my iPhone |
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Re: Chinese FT-817 TCXO?
I've had one of the cheap Chinese TCXO in my radio for a while and it's been absolutely fine. It's possible, with a bit of patience and swearing, to tweak the frequency of these to within a few Hertz of spec. Well worth the few pounds spent.
Now, if only they did cheap narrow CW filters on AliExpress ? |
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Re: Chinese FT-817 TCXO?
Ok, Chinese (Purchased on Amazon a few days ago) seems to work FB. It
is very clean. I only found a couple of very minor birdies (only one on 7.254Mhz that could possibly interfere with a very weak LSB station on 40m in perfectly quiet CONDX). I also noticed that the OEM LO had some birdies of its own too. I would imagine that they all produce some very minor spurious signals -- even the OEM TCXO. However, I think there are some out there that spray trash all over the band. This is not one of them. -KQ6UP On Tue, Oct 18, 2022 at 11:53 AM Steve Sawicki via groups.io <ab2et@...> wrote:
-- Thanks, Chris Maness |
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Re: Chinese FT-817 TCXO?
Ken, The Sad Part Was That The FT-817 (original)? Was in Fairly? Excellent Cosmetic Condition, No Battery, no power cord had the Mike and a 10M BNC Pull Up Antenna. The asking Was $225 Since I was Not Abel to Power and check I offers $175.. Well I Now Have a Third FT-817 in the "Fleet"? Powered up easily on the bench checked out 4.88W? and Even Made a contact on 10 M, Had Some Strange, Strange Frequencies in the Memories and it was "WideBanded".The Surprise Was the "SSB" Filter installed in the Slot.? ?
Best Regards. Steve AB2ET/4 |
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Beginner's Guide to HF Amateur Radio
Beginner's Guide to HF Amateur Radio. Week 2 of 3. Join us live via Zoom- Passcode: WEDNESDAY View Week 1 Recording at Anthony Luscre K8ZT Ohio Section Section Youth Coordinator & Education Outreach ARRL - The National Association For Amateur Radio? ? The Web Resource Hoarder- K8ZT Radio Website- Amateur Radio Resources for Students/Youth - |
Doc Sarvis
Anthony Luscre
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