Digital vfo for vintage transmitters. Interface to Gates BC-1T Transmitter.
Digital vfo for vintage transmitters. To safely operate with a tube transmitter, you need to ensure that key line voltages are isolated from the. DDS (or direct digital synthesis) has changed all Reviews For: Hagerty Radio Company Direct Digital VFO Category: Ham Radio Kits eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. Great VFO module. The output of DDS VFOs tends to be relatively low because Dr. Jan 1, 2021 · DIGITAL VFOSAMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands Universal VFO 10 KHz-160 MHz With Retro Analog Scale (variable Frequency Oscillator): A variable frequency oscillator (VFO) is a necessary component in any tunable radio transmitter or receiver. It gives a moderate amplitude signal and has high output impedance. Failure to properly spot your transmitter frequency can place your transmitter frequency as many as 2kHz or more off from your receiver frequency! This causes QRM and the loss of QSOs. 40m CW Transceiver with DDS VFO VFO DDS A VFO 80 / 40 m for the Johnson Viking and others Vintage Transmitters The VFO is a Wavehunter dual channel VFO based on a single BF245C FET. Interface to Gates BC-1T Transmitter. 00 plus $5. This time I will show you how to make a VFO that covers the range from 100 KHz to 160 MHz and uses a minimum number of compon… A Digital VFO for Vintage Transmitters Exterior Maine Brewing Equipment Main Page Adjustable Tv Mount Black Console Tv 43 Inch Tv Behind Tv Lighting Tv Cords Acoustic Panels Tv Wall Tv Wand Modern Floating Tv Console Black Tv Panel Audio Desk Jan Henningsson 43 followers Tinkerings with DDS VFOs DDS VFOs have revolutionised homebrew and QRP construction. Ihave had many discussions with other radio amateurs regarding the suitabil-ity of using a direct-digital synthesis (DDS) VFO with a vintage tube-type transmitter. Get the most out of your radio communication with the Digital VFO MODEL VFO1. to hack it for a vintage tube transmitter or receiver. Aug 2, 2025 · Introducing the Digital VFO MODEL VFO1, perfect for all your radio communication needs. Reviews For: Hagerty Radio Company Direct Digital VFO Category: Ham Radio Kits eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. Here are two extracts from the Johnson Viking II manual. Jul 22, 2021 · My current project is a Direct-Digital VFO (variable-frequency oscillator) using the Analog Devices AD9951. Apr 16, 2024 · DDS Modified Johnson VF-122 VFO. Amateurs or yore typically had the choice of a frequency agile VFO (controlled by hard to find variable capacitors and reduction drives) or a basically fixed frequency crystal oscillator, which unless you were lucky, relied on having a crystal specially cut. All-purpose 0 - 30 MHz DDS VFO and Signal Generator based on the article by WB2V in QEX July, 1997. Besides, you need some knobs and switches in order to make it play - oh, and a power supply up to the task of sourcing clean DC to a 14-bit analog device. Dec 18, 2018 · I agree, I have a bunch of old commercial and HB transmitters (as well as VFO’s) and have yet to find a plug and play standalone SS VFO with a knob for tuning and a digital readout. However, some interfacing is required. Ordering Information, AD9951 DDS-VFO: A complete parts kit is available which consists of: Commercial quality, 4-layer printed-circuit board with surface-mount parts pre-installed (AD9951 DDS, 1. Failure to properly spot the VFO/transmitter in the receiver is why many modern hams fail to make successful QSOs with vintage gear or regenerative receivers. Driver Amplifier Kit for Tubes I now have pc boards for the June 2011 CQ article, as well as a parts kit with instructions for the amplifier kit to drive vintage tube rigs. Reviews For: N3ZI DDS2 DDS VFO KIT Category: Ham Radio Kits eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. The stability, precision, and software flexibility of DDS VFOs make these devices an attractive option to keep vintage gear on the air. Click here for more info on this VFO. These are updated on a regular basis so I encourage you to stop back every so often. Greg Latta's Electrical Engineering and Amateur Radio Pages Welcome to my electrical engineering and amateur radio pages. Updated VFO Circuit Board, Showing Ultra-Tough LT1086 Linear Regulators. Greg Latía, AA8V For Straight Key Night, I wanted to put my 50 year old Eico 720 transmitter on the air, with the convenience of a VFO rather than crystal control. A VFO Buffer Amplifier WD8DAS DDS VFO Projects DDS VFO for use with vintage transmitters based on the module by ZL1CVD. Ideal for older transmitters or other applications requiring more output than a DDS can deliver alone. Price is $44. This versatile VFO is designed to fit a range of devices, including scanners, marine radios, two-way base radios, walkie talkies, ham radio transmitters and receivers, CB radios, and air band radios. I wanted the features of a modem VFO: digital frequency readout, memories, and freedom from drift and chirp. All told, this makes for a more-than-a-weekend long project. The Johnson Viking II needs a fairly large input signal at the VFO socket. Shaft encoder Jun 11, 2020 · The DDS VFO Amplifier had this to say about itself on Ebay: “Is the output of your DDS VFO not quite enough to drive a vintage transmitter? This tiny two stage amplifier will provide apx (sic) 10X voltage at 12v. 50 shipping Click This version allows a frequency adjustment for bandwidth mode with limits from 0Hz to 99MHz, it also allows removing the Channel mode and Radio Receiver mode, remaining exclusively for a VFO mode. 8 volt regulators, inductors and capacitors) and Through-hole components (resistors and capacitors) Optrex or Hantronix LCD (liquid crystal display), depending on availability. aysn4az2w7ilewobtzgdmylv80yrlg9udlkie8znnyaejxg