Johnson Viking Mobile Vfo

Enable Javascript to download files vikvfo122pdf 22 MB This is the BAMA archive. 807 p-p New PriceYear.

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Dimensions WHD 4 x 425 x 5 inch 102 x 108 x 127 mm.

Johnson viking mobile vfo. 75 - 10 Meters Input Power. Stable accurate calibration high bandspread tuning common replacement parts. 11 meters can be modified to cover either 505 â 5075 andor 602 â 6056 MHz with the addition of a mica padder capacitor in parallel with C56.

The Heathkit VF-1 by comparison is cheaply made with ceramic calibration trimmers instead of precision air variable capacitors. Johnson 122 vfo help. Construction and operating manual for Johnson Viking VFO 122.

7h x 65w x 1025d Approx. You could just take a look inside and see if the 0A2 is glowing. The VFO-122 was the first of many Johnson VFOs to use this problematically rated dropping resistor to feed the VR tube.

Compliments of Ron Trepka W8RON. The dropping resistor in my Viking 1 went open killing the VFO. Compact VFO vernier tuning ratio 7 to 1.

These transmitters are very rare. From the front of the transmitter this assembly is to the left of the VFO. Here are two extracts from the Johnson.

Johnson Viking Mobile Modes. No External option Power Supply. I recently acquired this transmitter from a fellow Ham operator.

To adjust the control set the Operate switch to the Tune position and set the VFOCrystal switch to the VFO position. Hammarlund HC-10 Icom IC-701 Collins Thirty-5-One Nye Viking 3000 Watt Tuner. The basic ranges of the 250-122 VFO are 175 â 2 MHz and 70 â 7425.

Output is sufficient to drive any straight pentode crystal stage as an amplifier. Circuit design rigid construction and heavy. It uses an external dynamotor power supply and yes the.

This VFO was my answer to that call. Viking Mobile VFO. The Viking Mobile is crystal controlled and was sold as a an under-dash mobile transmitter in the 1950s.

The Johnson Viking II needs a fairly large input signal at the VFO socket. Update Long term designproject nearing the end. It had been unused for decades.

The contemporary competition for the Johnson 122 VFO fell short by comparison. Compliments of Jim Jackson. Very small Portable or Pocket-Set Handheld 8 inch.

Yes I ran into a few issues but was able to work thru them. The VFO is a Wavehunter dual channel VFO based on a single BF245C FET. These manuals are available for download and free of charge.

The potentiometer right next to the 12AU7 keying tube is R39 and it controls the timed sequence keying in the transmitter. 240-152 Mobile VFO Kit - Johnson Company EF. USA 1952-19xx Discontinued Other.

These manuals are available for download and free of charge. 3400 LiteratureSchematics 1 Allied Radio Catalog Nº 150. Chuck Hurley K1TLI 274 Fruit St.

Price in first year of sale. View attachment 436612 Note R-39. There are also many VFO controlled transmitters out there like the Johnson Viking Ranger but their VFOs are old and unstable or were unstable to begin with.

The Johnson Viking II needs a fairly large input signal at the VFO socket. A VFO 80 40 m for the Johnson. You can go to this link to read how the timed sequence keying works in the Johnson Viking Ranger.

Compensated for an extremely wide range of ambient temperatures the Johnson Mobile VFO is only 4x 4 14x 5. Heathkit SB-221 Racal RA6778C Swan Cygnet Model 270 Yaesu FT-101ZD - MKIII. The reason you dont hear.

Manual for the Johnson Viking 122 VFO. This is the keying circuit. Here are two extracts from the Johnson Viking.

I was surprised to find the standard Viking II will cover all the WARC bands. VFO and Buffer-Amplifier for Jo hnson Viking II F1LAG JanuaryApril 2019 The VFO is a Wavehunter dual channel VFO based on a single BF245C FET. It uses seven vacuum tubes with an 807 final amplifier modulated by a pair of push-pull 807s.

Enable Javascript to download files vik-vfopdf 22 MB This is the BAMA archive. 160 - 10 Meters Input Power. Johnson VFO chirp frequency jump Home Up Two things always bothered me about my E F Johnson Viking Valiant and EF.

This control needs to be adjusted so that the VFO is not on when the key is not closed. 4XTAL selector VFO option 1807 final. What is needed is a modern VFO that can be used with these transmitters.

It gives a moderate amplitude signal and has high output impedance. The Johnson Viking 122 VFO is the best basic VFO ever made. When I would put the VFO on spot and listen to the beat note on higher bands the beat frequency changed significantly as I activated and tuned the power amplifier.

It gives a moderate amplitude signal and has high output impedance. New price 1952 in the US. Johnson Viking Ranger Modes.

These sit on the shelf too wasting away. Rockwell Collins HF-2050 Receiver Dovetron RTTY Unit Regenerative Harllicrafters HT-44. A diminutive variable frequency oscillator designed specifically for mobile use.

I have always dreamed of a stand alone Ranger. The earliest versions of the Ranger do not have this circuit but Johnson provided a kit to add the circuit to those units. 9950 kit14450 wired1952-59 Size.

Ef Johnson Viking 6 N 2 Vfo 1801297612