browning mrk III freq problem
browning mrk III freq problem
cannot get trans on freq when on the crystals. only way i can is when i use the glen. the freq counter just jumps around all over the place. i have tried to tune till i'm blue in the face. hope someone can help. junkman p.s. the vfo on the trans will not put it on freq. i changed the air cap. it wiil not stabalise.
Last edited by junkman on Sunday 20th Jan 2008, 0:33, edited 1 time in total.
- The Defpom
- Site Admin
- Posts: 436
- Joined: Friday 20th Aug 2004, 18:06
- Location: New Zealand
- Contact:
Re: Browning mrk III freq problem
There are 3 Browning MK III radios, the Eaglette III, Golden Eagle Mark III, and SST III.
The problem sounds like a weak Oscillator. If the radio is Golden Eagle Mark III.
Check the supply voltage at pins 1 and 6, of V1 (12AX7) and which should be about 150 VDC ? 10%.
Check the output of tube V1 pins 3 and 8 or try replacing the tube,
Also, check the caps C6 and C38 has they maybe leaking.
The problem sounds like a weak Oscillator. If the radio is Golden Eagle Mark III.
Check the supply voltage at pins 1 and 6, of V1 (12AX7) and which should be about 150 VDC ? 10%.
Check the output of tube V1 pins 3 and 8 or try replacing the tube,
Also, check the caps C6 and C38 has they maybe leaking.
Rick.
Re: Browning mrk III freq problem
thanks rick. it is a golden eagle ssb.iwill chk those.i did replace the 12ax7,replaced the air cap for the vfo, replaced the 6.048 crystal. works fine when i use the glen slider. jackRick wrote:There are 3 Browning MK III radios, the Eaglette III, Golden Eagle Mark III, and SST III.
The problem sounds like a weak Oscillator. If the radio is Golden Eagle Mark III.
Check the supply voltage at pins 1 and 6, of V1 (12AX7) and which should be about 150 VDC ? 10%.
Check the output of tube V1 pins 3 and 8 or try replacing the tube,
Also, check the caps C6 and C38 has they maybe leaking .
Re: Browning mrk III freq problem.
First set the radio up like so
Channel Selector to channel 12
VFO to 1/3 mesh
Mode to AM
Turn on and let the radio warm-up for 2 minutes
With a VTVM connect to Pin 9 of V6 (6GH8), adjust L5 for ? 8 Volts.
With a frequency counter and a 10 to 1 probe, connect the counter to Pin 2 of V6 (6GH8), you should see the mixer frequency which should be 21.4585 MHz, if this is ok connect the counter to Pin 1 of V3 (6CB6), you should see the output frequency which should be 27.105 MHz.
At the point let us know how you get on.
Channel Selector to channel 12
VFO to 1/3 mesh
Mode to AM
Turn on and let the radio warm-up for 2 minutes
With a VTVM connect to Pin 9 of V6 (6GH8), adjust L5 for ? 8 Volts.
With a frequency counter and a 10 to 1 probe, connect the counter to Pin 2 of V6 (6GH8), you should see the mixer frequency which should be 21.4585 MHz, if this is ok connect the counter to Pin 1 of V3 (6CB6), you should see the output frequency which should be 27.105 MHz.
At the point let us know how you get on.
Rick.