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Jack Purdum
Way too expensive for what you get. What don't you like about the one you have? Jack, W8TEE From: Mark via Groups.Io <mark2w0jmk@...> To: [email protected] Sent: Friday, February 17, 2017 4:44 PM Subject: [BITX20] AD 9850 DDS VFO ON BANGGOOD Hi all my first post on here and may I say what a great place to be. I have a Bitx40 and was wondering if adding this dds would work better than the one supplyed with the kit. Thanks Mark 2W0JMK |
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Hi thanks for the quick reply. The noise I get when tuning is one thing the steps I would like to control be it a 100Khz 10Khz or even 1Khz steps an rit function as well would be nice. I think the AD9850 would let me do all that and maybe more. I don't know much about this sort of thing sorry. Mark 2W0JMK
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You can easily build what you want. Use a Nano, a AD9850 board,
a decent encoder, a display, and a few buttons. You can easily get the Ladderline code (q.v.) to work. I note that the e-bay device claims a 0-55 MHz range. You will be lucky to get 1-30 MHz with any decent results. Jack is right, This thing is at least 2x expensive for what you get. The nicest thing about it is the pre-made pc board. You will have to learn about how to make and operate it. That's a good thing. john AD5YE |
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Jack Purdum
I don't know if K2ZIA still has any boards...write him before ordering as he has not been very responsive lately. You can see the VFO and assembly manual at: ?www.farrukhzia.com/k2zia? Jack, W8TEE From: "mikeyancey@..." <mikeyancey@...> To: [email protected] Sent: Friday, February 17, 2017 11:16 PM Subject: Re: [BITX20] AD 9850 DDS VFO ON BANGGOOD Yes, it would work, but as mentioned - too expensive. Try AliExpress or DX.com or eBay and you should find 'just' the AD9850 board by itself (no LCD, buttons, etc). These are around US$6.50 to US$9.50.? Mike Yancey
Dallas, Texas |
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Hi everyone. This is the measurement I made of these generic DDS output which I posted on another group to which I belong. These generic DDS are sometimes supplied together as a bundle with an Indonesian 6 band ssb transceiver kit sold by countless sellers on e-bay and other websites. The DDS is based on a design by a radio amateur from India?http :// www. (remove the spaces in the link). I hope that you will all find this useful as to what to expect from this DDS Regards Lawrence On Fri, Feb 17, 2017 at 10:44 PM, Mark via Groups.Io <mark2w0jmk@...> wrote:
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Lawrence Macionski
There is a 6 band QRP 5 watt Transceiver sold on Ebay and elsewhere.. That board is around $44... I have seen it in action on some Chinese YOUTUBE video.. Even with a very professional looking case. This is the VFO to that Transceiver. which brings us to again question the common sense of those that have purchased the BITX40 and are wishing to multi-band it... Especially when there is something like this out there. Think about this- BITX40 - 1 band $59 USD - but 6 bands transceiver board for? $44 USD approx and this DDS VFO for $35.83 USD for about $80 USD .? $20 USD more... I mean- I really enjoy my BITX40 V3 purchase, but it's 40 meters. It is, what it is. I think it is worth every penny. HOWEVER--? If I want more bands. 2-3-4-5? there is a proven alternate route. That also? addresses USB- LSB- CW- RIT- MEMORIES- VFO A- VFO B... de Larry W8LM ARRL Life Member - Licensed 50 years... |
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Jack Purdum
Larry: I can't find the listing for the transceiver. Do you have a URL for it. Jack, W8TEE From: Lawrence Macionski via Groups.Io <am_fm_radio@...> To: [email protected] Sent: Saturday, February 18, 2017 9:23 AM Subject: Re: [BITX20] AD 9850 DDS VFO ON BANGGOOD There is a 6 band QRP 5 watt Transceiver sold on Ebay and elsewhere.. That board is around $44... I have seen it in action on some Chinese YOUTUBE video.. Even with a very professional looking case. This is the VFO to that Transceiver. which brings us to again question the common sense of those that have purchased the BITX40 and are wishing to multi-band it... Especially when there is something like this out there. Think about this- BITX40 - 1 band $59 USD - but 6 bands transceiver board for? $44 USD approx and this DDS VFO for $35.83 USD for about $80 USD .? $20 USD more... I mean- I really enjoy my BITX40 V3 purchase, but it's 40 meters. It is, what it is. I think it is worth every penny. HOWEVER--? If I want more bands. 2-3-4-5? there is a proven alternate route. That also? addresses USB- LSB- CW- RIT- MEMORIES- VFO A- VFO B... de Larry W8LM ARRL Life Member - Licensed 50 years... |
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Hmm. ?Unassembled. ?No VFO. ?No PA. ?No lowpass filters. ?No instructions. ?The blurry schematics look pretty sparse once you ignore all the band switching, likely has the usual NE602 mixers. ?I'd bet the Bitx40 performs far better, especially given that most buyers likely never get this thing running. ? ??http://gm1sxx.blogspot.com/2015/07/the-heart-of-transceiver.html The Bitx40 is pretty close to being multiband. ?Needs some Raduino code to move the VFO and BFO. ?And needs new bandpass and lowpass filters for each band desired. ?I'd like to see the main Bitx40 board continue to be stuffed with filters for 40m, but possible to remove those parts and put in socket strips for plugin filters. On Sat, Feb 18, 2017 at 06:23 am, Lawrence Macionski wrote:
There is a 6 band QRP 5 watt Transceiver sold on Ebay and elsewhere.. That board is around $44... I have seen it in action on some Chinese YOUTUBE video. ? |
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Hi Larry, The difference is that the Indonesian xcvr is only about 1mW output so you will still have to add an amplifier.Also it's not a beginners project. There are quite a few mods for the kit on the facebook group page/s Regards Lawrence (9H1AV) On Sat, Feb 18, 2017 at 3:23 PM, Lawrence Macionski via Groups.Io <am_fm_radio@...> wrote:
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Mark