The distortion is deliberate. It is from the third harmonic so that you can get up to 450 MHz output from what is a 150 MHz unit. Also understand you are using a 70 MHz Oscilloscope so you will be getting a 3dB roll-off around 70 MHz.
Great review. I was interested in this made in China product as its priced at $170 on amazon to work on alignment of am radio's but now it's clear that I should avoid it. Thanks!
I will buy one tomorrow, the price would be ok just for the case and the knobs. I would like to mod it until it becomes a fully working unit. Maybe add a AGC circuit to the oszillator to fix the amplitude problem
@@retrotechandelectronics Its called Г4-70 in russian and G4-70 in english. You can find an entry with pictures on radiomuseum.org . Amazing build quality, must have cost a fortune back then! Now they are very cheap
Output off this device is generally loosely coupled to an AM radio antenna and doesn't not use a connector. Id also imagine that while impedance matching the output could stabilize it, in that application it already barely puts out enough voltage to do the job, the 50 ohm termination would make that considerably worse.
*The units power supply is very noisy. Upgrade the power supply filtering or replace with an external supply and run at 9V and the SNR performance improves.*
good video on this rig. im looking for a cheap sig gen to only do a few things to cb radio. to adjust the signal meter to s9 and align a cb radio and to check frequency. I know i have to get a freq counter. would this be ok??
Probably the trimpots were not properly adjusted and the distortion of the sine can be corrected by them. A shield in the RF circuit will isolate the components of the interference caused by the transformer induction with these horrible wires running like a radiating antenna!
I haven't seen it in the video. In fact the generator is unreliable. I would add a filter of AC capacitor (P ) -inductor-(S) capacitor(P) and put a shield in the variable and coils.
@@retrotechandelectronics the signal gen... lol.. wanna sell it .. cheap ? iam lookin for cheap one. like to get old tube style but prices are out of my range.
yeah for some dirt cheap lol cheapest i seen with ship was 82 bucks.. hard to get that much up...ill keep looking around.. maybe ill try brewing one.. but thank you for responeding.. take care..
![[UNCUT] ขยี้ "อลิส" ปม "คลิปลับแตงโม" เปิดชื่อคนพยายามแฮก "มือถือแตงโม" I คนดังนั่งเคลียร์I 10ก.พ.68](http://i.ytimg.com/vi/_RPLEIi5Sz8/mqdefault.jpg)
The distortion is deliberate. It is from the third harmonic so that you can get up to 450 MHz output from what is a 150 MHz unit. Also understand you are using a 70 MHz Oscilloscope so you will be getting a 3dB roll-off around 70 MHz.
This is the best review I have ever seen for that RF generator.
Thanks.
Great review. I was interested in this made in China product as its priced at $170 on amazon to work on alignment of am radio's but now it's clear that I should avoid it. Thanks!
Thanks, makes my decision to buy easy ;-)
Glad I could help!
Very good review, is like i opened my TSG-17. Mine is in the box, i can't trust it.
I wouldn't call it lack of trust, but it is not wonderful. It will calibrate an AM radio with a frequency counter and an ftt
I will buy one tomorrow, the price would be ok just for the case and the knobs. I would like to mod it until it becomes a fully working unit. Maybe add a AGC circuit to the oszillator to fix the amplitude problem
I havent checked to see whats out there these days as a new offering.
@@retrotechandelectronics Bought an 70s russian milspec unit for the same price instead. Got randomly recommended on ebay, best decision ever!
@@WolfmanDude what model?
@@retrotechandelectronics Its called Г4-70 in russian and G4-70 in english. You can find an entry with pictures on radiomuseum.org . Amazing build quality, must have cost a fortune back then! Now they are very cheap
@@WolfmanDude nice! Make a video or restoration or operation
You might find the frequency response improves with the lead terminated with 50 Ohms.
Output off this device is generally loosely coupled to an AM radio antenna and doesn't not use a connector. Id also imagine that while impedance matching the output could stabilize it, in that application it already barely puts out enough voltage to do the job, the 50 ohm termination would make that considerably worse.
Retro Tech & Electronics It would drop the level but would also reduce distortion from reflections. Worth a try surly?
*The units power supply is very noisy. Upgrade the power supply filtering or replace with an external supply and run at 9V and the SNR performance improves.*
good video on this rig. im looking for a cheap sig gen to only do a few things to cb radio. to adjust the signal meter to s9 and align a cb radio and to check frequency. I know i have to get a freq counter. would this be ok??
CB is 11metre band around 27MHZ and maybe just fine, though this is AM and I believe CB is LSB.
The biggest problem with this is the total lack of RF screening and a decent RF output attenuator. Proper ones are heavy with lots of metal screening.
This is true... Its what a few dollars gets ya.
@@retrotechandelectronics Yea, better to go vintage. Far better stuff on Ebay for half the price.
True!
Is it good for cb radios? The video was good too thank you
CB is 11 metere band... around 27mhz but LSB so it may not work.
Probably the trimpots were not properly adjusted and the distortion of the sine can be corrected by them.
A shield in the RF circuit will isolate the components of the interference caused by the transformer induction with these horrible wires running like a radiating antenna!
Do you mean the part in the video where I adjusted the trimpots and it didn't fix the distortion? Or another part I missed?
I haven't seen it in the video. In fact the generator is unreliable. I would add a filter of AC capacitor (P ) -inductor-(S) capacitor(P) and put a shield in the variable and coils.
my TSG-17 on the E range produces no usefull output until 15.1MHz. Really annoying, I need 10.125 and 14.125. Anyone found a fix?
AM on 20metre?
wow
yup.
si si... mod always on... until u touch that ext. switch,, then tis off
Buying an RF generator only takes 50 years to pay off.
wanna sell it?
Huh?
@@retrotechandelectronics the signal gen... lol.. wanna sell it .. cheap ? iam lookin for cheap one. like to get old tube style but prices are out of my range.
you can buy then dirt cheap on ebay
yeah for some dirt cheap lol cheapest i seen with ship was 82 bucks.. hard to get that much up...ill keep looking around.. maybe ill try brewing one.. but thank you for responeding.. take care..
www.ebay.com/itm/Vintage-Knight-RF-Signal-Generator-By-Allied-Radio/113371369596?hash=item1a6575d07c:g:KXYAAOSw9NNb6yfI:rk:7:pf:0
I think that scope is garbage too, more garbage than the generator.
thanks for sharing.