Finally got around to replacing the fried transistors and the supply diode in my inop '211. This unit had been repaired under warrantee before with no ...
2198
Callum M0MCX
callum_m0mcx
Mar 6, 2008 5:11 pm
Hugo, Did you solve your problem? I've found an interesting article for you to read, it's here: ...
2199
Hugo Luiz
hugoluiz2000
Mar 7, 2008 7:14 pm
Hi Callum, No I didn't solve my "problem". I tried to find, here in Venezuela, the cooper strip but it isn't easy. I tried a different antenna configuration,...
2200
Callum M0MCX
callum_m0mcx
Mar 7, 2008 10:00 pm
Hugo, Please keep us all informed of progress – some of us are very interested in how you are managing this problem. Good luck, Callum McCormick ...
2201
Pete F.
wb4ydy2
Mar 8, 2008 4:28 pm
Update on my SG-237 and 160 meter loop problem. The recommendation from SGC was to shorten the loop length from where I was at 580' down to 400' to 450' long....
2202
John Champa
k8ocl5
Mar 9, 2008 7:59 am
Pete, Oy! I hate to shorten antennas. But if that was one of many possible answers, then you certainly shortened it enough. So I don't think that is the...
2203
Callum M0MCX
callum_m0mcx
Mar 9, 2008 8:51 am
Pete, I had to reply because I can't understand what's going on here either - you poor OM! Right, I'm sure that you've done to death all what I'm going to...
2204
wb4ydy2
Mar 9, 2008 1:31 pm
Thanks Callum and John for your ideas, In short, I have tried everything both of you mentioned. All cables are now loaded with ferrite chokes - on both ends! ...
2205
Al
n6tez
Mar 9, 2008 3:01 pm
I'd be curious if anyone has a fully functional Johnson Matchbox they would be willing to part with and the cost. This would allow me to install the SG-230 on...
2206
Callum M0MCX
callum_m0mcx
Mar 9, 2008 5:46 pm
Wow. This is really foxing me Pete. I'm working with James (M3YOM) with his Smartuner issue. Give me a day or so and I'll tell you how we (he!) fixed that. You...
2207
James Thresher
jamesthresher
Mar 9, 2008 7:41 pm
My SG-230 has stopped working, it doesn't appear to be tuning at all, I have tried it on various antenna's and it will only very occasionally try to tune...
2208
John Champa
k8ocl5
Mar 9, 2008 8:11 pm
Pete, I think Callum is onto something. RF getting into the 237 will cause problems. Have you seen this month's QST article by Dick Jansson? He also uses a...
2209
John Champa
k8ocl5
Mar 9, 2008 10:31 pm
Pete, I wrote to the guru...Dean wrote the ARRL Antenna Handbook. Here is his take: Gents: The problem with a single loop trying to cover a whole range of...
2210
QRP_1@...
kc8aon
Mar 9, 2008 10:47 pm
Gang, Today I noticed that my SGC-237 doesn't seem to be operating correctly. On 80 meters, I can tune portions of the band real well - down to almost a...
2211
QRP_1@...
kc8aon
Mar 9, 2008 10:56 pm
The problem with a single loop trying to cover a whole range of frequencies is that the feed-point impedance (and hence the impedance seen at the bottom of the...
2212
John Champa
k8ocl5
Mar 10, 2008 6:05 am
Rick, I think you are correct. The 237 is a Pi network. That's is better. Nonetheless, it apparently is still insufficient range to deal with a single loop's...
2213
w8fn1
Mar 11, 2008 2:15 pm
... all... I own a pair of SG-230s and have had to fix both of them a few times. The power sensing diodes in the tuner's coupler circuitry seem to be...
2214
Dom Bragge
dom_suz
Mar 12, 2008 4:57 am
... Also, do a simple check that the coax is ok, from the centre pin into the actual tuner. I've had the coax inner come loose resulting in same symptom. dom...
2215
kevin4617
Mar 13, 2008 1:17 am
James, I too have repaired my SGC-230 a couple times. Each repair it was the RF sense diodes D4, D9, and D10. I dont think the lightning damage theory...
2216
James Thresher
jamesthresher
Mar 13, 2008 6:52 am
Thanks for all the advice guys, I suspect you are probably right that it is one of the RF sensing diodes that have gone. The unit is only a couple of months...
2217
Pastor Steve
pastorstevedoll
Mar 14, 2008 2:09 pm
Good morning all; I just wanted to report to everyone. After being a member of this group for a long time and carefully reading each problem and response, I...
2218
Chris
kngsqueak
Mar 14, 2008 2:16 pm
On Fri, Mar 14, 2008 at 10:09 AM, Pastor Steve ... They are great tuners, you'll grow to really love the convenience of it. You are correct, much better off...
2219
John Champa
k8ocl5
Mar 14, 2008 3:21 pm
Steve, Let me add my comments to others. I do not know how much difference adding the extra 10 - 20 feet to the antenna will make, but I like Kert Sturba's...
2220
qrp_1@...
kc8aon
Mar 14, 2008 4:42 pm
Get a least one 1/4 wave radial installed for each band you want to operate. That should do the trick! {snip} Adding the radials will help, but if they are...
2221
Pastor Steve
pastorstevedoll
Mar 14, 2008 5:46 pm
John; Thanks. That’s what I meant by adding 2 for each band. I will admit to being a EE (boy, now I’ve done it) and yet I cannot seem to exactly ...
2222
Pastor Steve
pastorstevedoll
Mar 14, 2008 5:50 pm
OK, Rick. That may be an answer to one of my major questions as to all this hullabaloo about 1/4 landa radials. If they are elevated, then, of course they...
2223
John Champa
k8ocl5
Mar 14, 2008 7:09 pm
Steve, Yes, yes, Rick is correct...just get as much wire into the ground as you can regardless of length: Any gauge, any length, any type. I was thinking of...
2224
QRP_1@...
kc8aon
Mar 15, 2008 2:28 pm
Gang, Wanted to run something past you guys to see if anyone has ever done it or has any input. I have an old 75 meter Hamstick antenna I'm not using. I know...
2225
Steve Galchutt
steve_n0tu
Mar 15, 2008 2:51 pm
... done it > or has any input. I used an old hamstick for the bases of my HB Bug Catcher. Striped off the heat-shrink and windings. Replaced them with good...
2226
Al
n6tez
Mar 15, 2008 2:52 pm
Morning Steve and John, Congrates Steve on getting you 237! John, I'd like to add to your wise suggestion of at least one 1/4 wave radial or counterpoise for...
